[ANN] BleachBit 0.3.0
BleachBit is a Internet history, locale, registry, privacy, and file cleaner for Linux on Python v2.4 - v2.6. Notable changes for 0.3.0: * Clean locales (also called localizations). * When deleting, optionally shred files to hide contents. * Erase the clipboard. * Add Bulgarian translation. * Improve the GUI. * Add a preferences dialog. * Fix several bugs including a serious bug that prevented some parts of Firefox from being cleaned. Release notes http://bleachbit.blogspot.com/2009/01/locale-cleaner-030-released.html Download http://bleachbit.sourceforge.net/download.php -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
PyCon Italy 2009 - Florence, May 8th-10th
PyCon Tre (http://www.pycon.it), the third edition of PyCon Italy, will take place in Florence from the 8th May to 10th May 2009. Confirmed keynote speakers so far include Guido Van Rossum, more to come. The Call for papers (http://www.pycon.it/pycon3/call-for-paper/) will be open from February, 9th, till March, 8th. Most website pages are currently available in italian only, but translations are in the way. -- Alan Franzoni alan.franzoni@gmail.com - Remove .xyz from my email in order to contact me. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
PyCon 2009 registration is now open!
Register here: http://us.pycon.org/2009/register/ Information (rates etc.): http://us.pycon.org/2009/registration/ Hotel information reservations: http://us.pycon.org/2009/about/hotel/ Early bird registration ends February 21, so don't delay! -- David Goodger, PyCon 2009 Chair -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
Intro to to Scientific Computing with Python Training Feb 16-20 Austin, TX
Hi All, Enthought will be hosting our Introduction to Scientific Computing with Python class on February 16-20 here in Austin, Texas. The class is specifically oriented toward scientists and engineers who want to learn about all of the tools and techniques available in Python, and in the Enthought Python Distribution specifically. The class has a practical, data processing focus, but will also cover more advanced topics such as easily building graphical user interfaces and making interactive plots. We expect that participants will have experience programming, but no prior Python experience is required. The course is highly interactive, and participants will alternate between learning new techniques, and then immediately applying them in exercises. Therefore, a laptop computer is a must. The course lasts five days, and takes you from the basics of the Python language, all the way to building interactive plotting applications. The schedule is as follows: Day 1: Introduction to the Python Language Day 2: Array Calculations with NumPy Day 3: Numeric Algorithms with SciPy Day 4: Interfacing Python with Other Languages Day 5: Interactive 2D Visualization with Chaco Tuition is $2500. For more information on the course, or to register, visit http://www.enthought.com/training/intro_to_sci_comp.php or call Leah Jones at 512.536.1057. Don't hesitate to call, or email i...@enthought.com with any questions. -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
Tutorial on working with Excel files in Python (without COM and cross platform!) at PyConUS 2009
Hi All, Too many people in the Python community think the only way to work with Excel files in Python is using COM on Windows. To try and correct this, I'm giving a tutorial at this year's PyCon in Chicago on Wednesday, 25th March that will cover working with Excel files in Python using the pure-python libraries xlrd, xlwt and xlutils. I'll be looking to cover: - Reading Excel Files Including formatting, unicode dates and formulae. - Writing Excel Files Including formatting with easyxf and things like freeze pains, print areas, etc - Filtering Excel Files A run through on the structure of xlutils.filter and some examples to show you how it works. - Workshop for your problems I'm hoping anyone who attends will get a lot out of this! If you're planning on attending and have a particular problem you'd like to work on in this part of the tutorial, please drop me an email and I'll try and make sure I come prepared! All you need for the tutorial is a working knowledge of Excel and Python, with a laptop as an added benefit, and to be at PyCon this year: http://us.pycon.org I look forward to seeing you all there! Chris -- Simplistix - Content Management, Zope Python Consulting - http://www.simplistix.co.uk -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
Re: How do I say two classes up in the inheritance chain in python?
Daniel Fetchinson fetchin...@googlemail.com wrote: class child1( parent1 ): def meth( self ): # do something c super( parent1, self ).meth( ) # I want to invoke meth on grandparent So just call: grandparent.meth(self) If you want to ignore the inheritance hierarchy then go ahead and ignore it. Only use super if you want to respect your parents. :) -- Duncan Booth http://kupuguy.blogspot.com -- http://mail.python.org/mailman/listinfo/python-list
Re: optparse with numpy.array?
Thanks,
James I will try your suggestion!
Robert, what mean with interactively is that i would like to create an
array in the ipython shell, e.g. with m_i = array([1.0, 2.0, 3.0]) or
by reading a file with values etc., and then execute my program with myprog
-m m_i and thus pass the array m_i to my program.
This is just an example. I would like to pass several arrays. My program
will be wrapped inside a loop and the arrays are updated
in each loop.
I have never heard of the argparse library. Do you think that it would be
better to use that in my case?
Best regards,
Johan
On Tue, Jan 27, 2009 at 7:12 AM, Robert Kern robert.k...@gmail.com wrote:
On 2009-01-27 00:01, Johan Ekh wrote:
Thank you James,
but I just can't optparse to accept an array, only integers, floats ans
strings.
My code looks like this
from optparse import OptionParser
parser = OptionParser()
parser.add_option('-t', '--dt', action='store', type='float',
dest='dt_i', default=0.1, help='time increment where lsoda saves results')
parser.add_option('-T', '--tstop', action='store', type='float',
dest='tstop_i', default=1.0, help='duration of the solution')
parser.add_option('-m', '--mass_vector', action='store', type='float',
dest='m_i', default=[1.0, 1.0], help='vector with lumped masses')
op, args = parser.parse_args(sys.argv[1:])
I want this to work for m_i = array([1.0, 2.0, 3.0]) but the optparse
complains that m_i is not a float.
Well, yes, because you declared that --mass_vector was type='float'. You
will need to subclass OptionParser in order to parse something that is not
one of the included types. Yes, it is a bit cumbersome; it's one of the
reasons I usually use the third-party argparse library instead. You only
need to supply a parsing function rather than subclass.
I'm afraid I don't really understand what you want when you say that you
want to create an array interactively. Can you show me an example command
line that you want to parse? Keep in mind that in many shells, ()[]
characters are specially handled by the shell and are not convenient for
users.
BTW, I am subscribed to the list. You do not need to Cc me.
--
Robert Kern
I have come to believe that the whole world is an enigma, a harmless
enigma
that is made terrible by our own mad attempt to interpret it as though it
had
an underlying truth.
-- Umberto Eco
--
http://mail.python.org/mailman/listinfo/python-list
--
http://mail.python.org/mailman/listinfo/python-list
Re: How do I say two classes up in the inheritance chain in python?
Daniel Fetchinson fetchin...@googlemail.com writes: The meth methods in child1 and child2 are the same, except that in the last super call, one is referring to parent1, the other is referring to parent2. It's important to learn that, in a language with multiple inheritance, “superclass of this instance” is *not* the same concept as “parent of this class”. The class you're coding may end up at any arbitrary point in a resolution chain, despite what the class inherits from. It's also important to be aware of the hairiness of Python's ‘super’ URL:http://www.artima.com/weblogs/viewpost.jsp?thread=236275. -- \“No matter how cynical you become, it's never enough to keep | `\up.” —Jane Wagner, via Lily Tomlin | _o__) | Ben Finney -- http://mail.python.org/mailman/listinfo/python-list
Re: How do I say two classes up in the inheritance chain in python?
Daniel Fetchinson a écrit : I have two classes that both inherit from two other classes which both inherit from a single class. The two children have two almost identical methods: class grandparent( object ): def meth( self ): # do something class parent1( grandparent ): def meth( self ): # do something p1 super( parent1, self ).meth( ) class parent2( grandparent ): def meth( self ): # do something p2 super( parent2, self ).meth( ) class child1( parent1 ): def meth( self ): # do something c super( parent1, self ).meth( ) # I want to invoke meth on grandparent If so, it might be better to explicitly call grandparent.meth (passing self as first argument). But this is an obvious design smell IMHO. What you have is : def meth(self): do_something_more_or_less_specific call_granparent Looks like a candidate for a template method. Since you don't have hand on Grandparent, the simplest would be to add an additional base class, ie: class Abstract(Grandparent): def do_something(self): raise NotImplementedError def meth(self): self.do_something() super(Abstract, self).meth() class Parent1(Abstract): def do_something(self): # do something p1 class Parent2(Abstract): def do_something(self): # do something p2 Now you're problem is to factor out do_something() for Child1 and Child2. The solution is quite simple : just define it outside the class statements, and adds it afterward: def do_something_children(self): # code here class Child1(Parent1): # code here Child1.do_something = do_something_children class Child2(Parent2): # code here Child2.do_something = do_something_children HTH -- http://mail.python.org/mailman/listinfo/python-list
Re: Counting number of objects
Thank you everyone for your very helpful comments and suggestions. I have interacted in other newsgroups, but this is the most helpful of them all. As per the comments, I have now decided to go with the weakref mechanism - as per Andreas suggestion, functionally it looks correct that the person should not know the total number of people. So, in a higher level class, have a weakref list which contains a reference to each person. Total count will be len(list) at any time. Now, I couldnt find a weakref list - so I am using WeakKeyDictionary with the value as None - since len(dict) also should give me the data any time. I have another question here. In the documentation, it is mentioned that - Note: Caution: Because a WeakKeyDictionary is built on top of a Python dictionary, it must not change size when iterating over it. This can be difficult to ensure for a WeakKeyDictionary because actions performed by the program during iteration may cause items in the dictionary to vanish by magic (as a side effect of garbage collection). Now, the only two operations that I am doing are - __init__: d = weakref.WeakKeyDictionary() method y: x = aa() d[x] = None method z: total = len(d) I believe that all the commands which I perform on WeakKeyDictionary here - (adding a new element) (len(d)) - are atomic - or atleast nothing that can cause any worry as per the Note given above. Can anyone let me know whether my assumption is correct or not? Reason: My code has many many number of threads which interact with each other in myraid ways - so I do want to decrease the number of locks as much as possible. Especially I do not want to block other threads just for getting the count. -- http://mail.python.org/mailman/listinfo/python-list
How to get text from a surface
Hi, I am loading an image into pygame. i am trying to get the text from the surface. I used pyTesser to read the text from a surface/image but if the font size of the text is less then 16, it doesn't give me back the correct text from the surface. Is there any other way to get the text from the pygame surface. Thanks, Gopal -- http://mail.python.org/mailman/listinfo/python-list
Re: I'm a python addict !
Paul McGuire a écrit : On Jan 26, 10:54 am, J. Cliff Dyer j...@sdf.lonestar.org wrote: On Fri, 2009-01-23 at 20:25 -0800, Paul McGuire wrote: Want to change the type/behavior of an object from class A to class B? How about this: aobj = A() aobj.__class__ = B Try *that* in as simple-looking C++ or Java! Wow. That looks very powerful and fun. But scary. Any thoughts on how you would use that in a way that wouldn't unleash sulphurous code smells? This technique is perfect for implementing the GoF State pattern. Except when it is not !-) I tried twice to use this trick in real life code, and in both cases, it ended up being much more complicated than implementing the state pattern the canonical way. Not to say that it's hopeless - just that there's the usual difference between theory and practice. -- http://mail.python.org/mailman/listinfo/python-list
Re: unittest, order of test execution
But I was wondering, *should* this test be separated into two unit tests, one for each function? On the face of it, it looks that's how it should be done. This, however, raises the question: what's the order of test execution in the unittest? And how to pass values between unit tests? Should I modify 'self' in unit test? It's OK to run some tests in the same function. When one of the asserts fails, following the traceback will lead you straight to your problem. The order of test execution is done by default by sorting the test functions alphabetically. You may disable the sort by setting self.sortTestMethodsUsing to None. The simplest way to pass values between tests is to use the class it (self). Yinon -- http://mail.python.org/mailman/listinfo/python-list
Re: Does Python really follow its philosophy of Readability counts?
Russ P. a écrit : On Jan 26, 1:07 am, Bruno Desthuilliers bruno. 42.desthuilli...@websiteburo.invalid wrote: No. I can change the *team's* code. Please *read*. team's ownership, ok ? Or do I have to spell it out loud ? TEAM'S OWNERSHIP. Uh. You get the message, now ? Team ownership doesn't necessarily mean that you can just change code at will. Nope, but it surely means that I'm *not* changing someone else's code. In industry, teams usually have a leader that you need to check with before you can change an interface. This is totally unrelated. Would you give all those developers your password to get into the system? No? Wait a minute ... you mean you wouldn't trust them with your password? But what about openness? Are you some sort of fascist or what? Goodwin point. You loose. Good bye again, Mr P. You missed the point once again. In asking if you are a fascist, I was *parodying* your attitude that languages with enforced access restrictions are for fascists who don't trust their co-workers or employees. [I don't recall if you actually used that word I did not, and you should know better. or if it was someone else, but you did use BD, which carries the same general impression.] Can't you tell the difference, really ? So I parodied your hyperbole, Still not. But it's interesting to note that you consider everyone disagreeing with you as basically the same person. -- http://mail.python.org/mailman/listinfo/python-list
Re: unittest, order of test execution
On Jan 27, 11:33 am, Yinon Ehrlich yinon...@gmail.com wrote: But I was wondering, *should* this test be separated into two unit tests, one for each function? On the face of it, it looks that's how it should be done. This, however, raises the question: what's the order of test execution in the unittest? And how to pass values between unit tests? Should I modify 'self' in unit test? It's OK to run some tests in the same function. When one of the asserts fails, following the traceback will lead you straight to your problem. The order of test execution is done by default by sorting the test functions alphabetically. You may disable the sort by setting self.sortTestMethodsUsing to None. see: http://docs.python.org/library/unittest.html#unittest.TestLoader.sortTestMethodsUsing The simplest way to pass values between tests is to use the class it (self). Yinon -- http://mail.python.org/mailman/listinfo/python-list
Calling Python-tk code from C/C++
Hello all, This is my first post to this mailing list. Our requirement is to invoke a Tkinter python panel from a C++ GUI app where both GUI windows would run in 2 separate threads. We have written a sample PyQt application which calls this Tk panel using something like this:class TkPanel(threading.Thread):def run(self): # call showPaneldef showPanel():# create window = Tk.Tk() window.mainloop()def start():t = TkPanel()t.start()Now we call this from our main python code:def startPanel(self): import tkPanel tkPanel.start() # this calls tkwindow.mainloop() in a separate thread.This works absolutely fine when the invoking app is Python. However, we are having problems when the invoking app is in C/C++ and we use a similar logic.My question boils down to this: If I have code in C++ that has to invoke a Pythontk panel such that the panel runs in its own thread, what is the best approach?I tried studying the GIL and acquiring releasing/locks, but I must be doing something wrong. An y help would be greatly appreciated!Thanks!Rajhttp://www.rajorshi.net/blogDear pythonlist! Get Yourself a cool, short @in.com Email ID now! -- http://mail.python.org/mailman/listinfo/python-list
Re: optparse question
* Pat (Mon, 26 Jan 2009 20:02:59 -0500) Up until today, I never needed to pass any arguments to a Python program. [...] getopt resolved my immediate need, but I would like to know how one could use optparse to extract out the options from something like dir /s /b. If you actually read the documentation (it's right at the top) you knew that this is not possible: There are many different syntaxes for options; the traditional Unix syntax is a hyphen (“-“) followed by a single letter [...] The GNU project introduced -- [...] These are the only two option syntaxes provided by optparse. Some other option syntaxes that the world has seen include: [...] a slash followed by a letter, or a few letters, or a word, e.g. /f, /file These option syntaxes are not supported by optparse, and they never will be. This is deliberate: [...] the last only makes sense if you’re exclusively targeting VMS, MS-DOS, and/or Windows. Thorsten -- http://mail.python.org/mailman/listinfo/python-list
socket.unbind or socket.unlisten? - socket.error: (48, 'Address already in use')
I have a program that uses socket.bind() and socket.listen() frequently. After that program stops, it is not able to bind() again for a while: File /home/gandalf/Python/Lib/orb/accesspoints/srvtcp.py, line 27, in __init__ self.serversocket.bind((self.listen_address,self.port)) File string, line 1, in bind socket.error: (48, 'Address already in use') The problem with this, is that this server program SOMETIMES need to be restarted very quickly. I tried to find the solution in the socket module. But there is no socket.unbind or socket.unlisten. How can I tell the OS that I do not want to listen on that address anymore, so other programs can bind on it immediatelly? (Yes I know that I can use setsockopt to allow listening multiple sockets on the same address, but this is NOT what I need...) Thanks, Laszlo -- http://mail.python.org/mailman/listinfo/python-list
Re: Iterating through a file significantly slower when file has big buffer
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 pyt...@bdurham.com wrote: The following tests were run on a Windows XP system using Python 2.6.1 Unless you changed the defaults, the Windows XP system cache size is 10MB. When you use a larger read size, chances are it is blowing out that cache and causes metadata (file block locations) to have to be reread on your next read. You are also funnelling all the data through your CPU cache with a similar effect although it will be less noticeable. To change XP cache sizes, see: http://marc.info/?l=sqlite-usersm=116743785223905w=2 http://support.microsoft.com/kb/895932 http://www.techspot.com/tweaks/memory-winxp/ Roger -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.9 (GNU/Linux) iEYEARECAAYFAkl+4SkACgkQmOOfHg372QRgcACfVOdUWQGyj8xtNvHob/CtcM8g JsEAoKt/xI36iR5RuQOfZDMz2ze4L3Ia =DrDw -END PGP SIGNATURE- -- http://mail.python.org/mailman/listinfo/python-list
Re: USB in python
On Mon, 26 Jan 2009 11:08:48 -0600, Unknown wrote: On 2009-01-26, Lie Ryan lie.1...@gmail.com wrote: How about (a crazy idea) using the audio jack out? (DISCLAIMER: Little Hardware Experience). High pitched sound (or anything in sound-ology that means high voltage) means the device is on and low pitched sound off. 1) Pitch has nothing to do with voltage. A high-pitch sound and a low pitch sound can have the exact same voltage. 2) The OP's device requires quite a bit of power. There is almost no power available from the line-out jack, and the voltage is limited to about 1V. If his sound card has a power-amp (none do these days), he might be able to get a usable amount of power. The device will need an additional transistor to separate low voltage from the high voltage. He'll need more than a transistor. He needs a power supply, some sort of rectifier/detector, and a comparitor. It would be more interesting to use notch filters to detect different frequencies so that you could have multiple output bits. From the little I know on electronics, a simple, single transistor would (almost) immediately switch from on-to-off-to-on depending on the voltage of the control pin (I think it was the middle pin). I was suggesting this simplistic hack because as far as I comprehend the OP's need, he only need on-off switch instead of a complex multiple output bits. I don't know how much power can be pulled from jack out, Almost none, and what's there is very low voltage. That's why the power is taken from USB port. but for a home brewn device it is still feasible to draw power from USB and signal from jack out. It would probably be easier to buy a USB-parallel port chip. Then he's got power from the USB bus and something like 14 parallel I/O pins he can control. Alternatively A USB-serial chip will provide 2 outputs and 4 inputs. The idea was made on the basis that a USB microcontroller is not used. Getting power from USB should be much easier than getting data while the jack out can provide simple on-off signal. -- http://mail.python.org/mailman/listinfo/python-list
Re: practical limits of urlopen()
On Sat, 24 Jan 2009 09:17:10 -0800, webcomm wrote: Hi, Am I going to have problems if I use urlopen() in a loop to get data from 3000+ URLs? There will be about 2KB of data on average at each URL. I will probably run the script about twice per day. Data from each URL will be saved to my database. I'm asking because I've never opened that many URLs before in a loop. I'm just wondering if it will be particularly taxing for my server. Is it very uncommon to get data from so many URLs in a script? I guess search spiders do it, so I should be able to as well? urllib doesn't have any limits, what might limit your program is your connection speed and the hardware where the server and downloader is on. Getting 3000 URLs is about 6MBs, a piece of cake for a sufficiently modern machine on a decent internet connection (the real calculation isn't that simple though, there is also some cost associated with sending and processing HTML headers). Google indexes millions of pages per day, but they also have one of the most advanced server farm in the world. -- http://mail.python.org/mailman/listinfo/python-list
C-Python API problem
Hi, I was trying out the sample program to load a python script from C in the Python tutorial at http://docs.python.org/extending/embedding.html (Section: Pure Embedding).Usage: call pythonfile funcname [args] When running this script, I can run things like the following:call mytest foobut not any function which calls a Tk function:call mytest teekay Here is my mytest.py module:def foo():print funcdef teekay():import Tkinterr=Tkinter.Tkr()I get the following error in the latter case:Traceback (most recent call last):...import Tkinter ...import tkinter # If this fails your Python may not be configured for TkImportError: /software/lib/Linuxx86/python2.6/lib/python2.6/libdynload/tkinter.so: undefined symbol: PyTrueStructCall failedObviously, trying this from within a Python shell works fine.Any clues?Thanks,RajRajhttp://www.rajorshi.net/blogDear pythonlist ! Get Yourself a cool, short @in.com Email ID now! -- http://mail.python.org/mailman/listinfo/python-list
OpenGL in TK
Hi list! I am using pyOpenGL to do some 3D rendering. For now I am quite happy with the GLCanvas of wx, but I may want to publish some stuff later, and it would be nice if people would not need wx. I found that there used to be a TK widget called Togl, but it is not (anymore?) included in the TK package that comes with Python. Have others been able to use Togl, or any other OpenGL widget in TK? Thanks for any help, Almar PS: I use python 2.5.2 on windows -- http://mail.python.org/mailman/listinfo/python-list
Re: Plugin system, RuntimeWarning: Parent module 'ext_abc' not found while handling absolute import
En Mon, 26 Jan 2009 17:06:20 -0200, Torsten Mohr tm...@s.netic.de escribió: So mymodule is actually a package. Packages should *not* appear in sys.path. Oh, how does it find modules then? I thought that would be PYTHONPATH or sys.path ? The directory CONTAINING file foo.py must be in sys.path if you want to import foo. The directory CONTAINING package bar must be in sys.path if you want to import bar. There were some threds on this topic last month, see this by example: http://groups.google.com/group/comp.lang.python/t/ed47d8e31ca3d411/ -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Class behaving like a static class
Hi to all,
i have a module (a single .py file, actually), with a class called
HashedDir.
when i import the file and instanciate 2 instances of that class, when i
check the object's fields they're always the same, even if the two
objects should be different.
Eg:
h1 = HashedDir('someValue')
print h1.value # someValue
h2 = HashedDir('someOtherValue')
print h1.value # someOtherValue
print h2.value # someOtherValue
Any idea?
Thanks in advance
--
http://mail.python.org/mailman/listinfo/python-list
Re: USB in python
Some people got success in Arduindo using an older mobile cable which works as USB/Serial converters. So you can read and write data as a serial port using pyserial. On Tue, Jan 27, 2009 at 8:31 AM, Lie Ryan lie.1...@gmail.com wrote: On Mon, 26 Jan 2009 11:08:48 -0600, Unknown wrote: On 2009-01-26, Lie Ryan lie.1...@gmail.com wrote: How about (a crazy idea) using the audio jack out? (DISCLAIMER: Little Hardware Experience). High pitched sound (or anything in sound-ology that means high voltage) means the device is on and low pitched sound off. 1) Pitch has nothing to do with voltage. A high-pitch sound and a low pitch sound can have the exact same voltage. 2) The OP's device requires quite a bit of power. There is almost no power available from the line-out jack, and the voltage is limited to about 1V. If his sound card has a power-amp (none do these days), he might be able to get a usable amount of power. The device will need an additional transistor to separate low voltage from the high voltage. He'll need more than a transistor. He needs a power supply, some sort of rectifier/detector, and a comparitor. It would be more interesting to use notch filters to detect different frequencies so that you could have multiple output bits. From the little I know on electronics, a simple, single transistor would (almost) immediately switch from on-to-off-to-on depending on the voltage of the control pin (I think it was the middle pin). I was suggesting this simplistic hack because as far as I comprehend the OP's need, he only need on-off switch instead of a complex multiple output bits. I don't know how much power can be pulled from jack out, Almost none, and what's there is very low voltage. That's why the power is taken from USB port. but for a home brewn device it is still feasible to draw power from USB and signal from jack out. It would probably be easier to buy a USB-parallel port chip. Then he's got power from the USB bus and something like 14 parallel I/O pins he can control. Alternatively A USB-serial chip will provide 2 outputs and 4 inputs. The idea was made on the basis that a USB microcontroller is not used. Getting power from USB should be much easier than getting data while the jack out can provide simple on-off signal. -- http://mail.python.org/mailman/listinfo/python-list -- Msc. Muriel de Souza Godoi Computation Department State University of Maringá Brazil -- http://mail.python.org/mailman/listinfo/python-list
Re: Process crash with no reason
On Jan 26, 8:40 pm, Philip Semanchuk phi...@semanchuk.com wrote: On Jan 26, 2009, at 1:13 PM, gil.shi...@gmail.com wrote: Hi All, I'm running a program that is acting as a nice interface to sybase' replication server. The program is using the cherrypy web service for the GUI. The process is crashing every few days with no reason. In the log I can see INFO and DEBUG (No ERROR) log lines and I do not get any TraceBack python's message. This program is running on solaris 9 machine. Where can I see or what can I do in order to find out what causes the process to crash? I have tried simulating a traceBack message and I could see this traceback message in one of the log files I'm using. When the process crashes without my help, I don't have a clue. Let me know if you need any other info Although Python isn't immune to fatal errors like you describe, I'd immediately suspect a 3rd-party module instead, esp. one written in C or C++. Are you using anything like that? No I do not. Is there a way to monitor who had killed my process? Thanks -- http://mail.python.org/mailman/listinfo/python-list
Re: Class behaving like a static class
gu a écrit :
Hi to all,
i have a module (a single .py file, actually), with a class called
HashedDir.
when i import the file and instanciate 2 instances of that class, when i
check the object's fields they're always the same, even if the two
objects should be different.
Eg:
h1 = HashedDir('someValue')
print h1.value # someValue
h2 = HashedDir('someOtherValue')
print h1.value # someOtherValue
print h2.value # someOtherValue
Any idea?
Yes : post the relevant code - or at least the minimal code that
reproduces the unexpected behaviour.
There are quite a couple gotchas regarding class-vs-instance-attributes
and default-params, but none of them matches what you have here - at
least if 'value' is an attribute set on 'self' from within the
initializer. So either the above snippet is made up and you're in fact
having this problem with mutable attributes (like 'value' is a list and
you're appending to it) or there's something else in your code.
--
http://mail.python.org/mailman/listinfo/python-list
Re: Process crash with no reason
gil.shi...@gmail.com wrote: On Jan 26, 8:40 pm, Philip Semanchuk phi...@semanchuk.com wrote: On Jan 26, 2009, at 1:13 PM, gil.shi...@gmail.com wrote: Hi All, I'm running a program that is acting as a nice interface to sybase' replication server. The program is using the cherrypy web service for the GUI. The process is crashing every few days with no reason. In the log I can see INFO and DEBUG (No ERROR) log lines and I do not get any TraceBack python's message. This program is running on solaris 9 machine. Where can I see or what can I do in order to find out what causes the process to crash? I have tried simulating a traceBack message and I could see this traceback message in one of the log files I'm using. When the process crashes without my help, I don't have a clue. Let me know if you need any other info Although Python isn't immune to fatal errors like you describe, I'd immediately suspect a 3rd-party module instead, esp. one written in C or C++. Are you using anything like that? No I do not. Then how are you interacting with Sybase? TJG -- http://mail.python.org/mailman/listinfo/python-list
Re: socket.unbind or socket.unlisten? - socket.error: (48, 'Addressalready in use')
Laszlo Nagy ga...@s..eus.com wrote: I have a program that uses socket.bind() and socket.listen() frequently. After that program stops, it is not able to bind() again for a while: s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) This does the trick for me. - Hendrik -- http://mail.python.org/mailman/listinfo/python-list
Re: unable to print Unicode characters in Python 3
On 26 Gen, 19:16, jefm jef.mangelsch...@gmail.com wrote:
Hi,
while checking out Python 3, I read that all text strings are now
natively Unicode.
In the Python language reference (http://docs.python.org/3.0/reference/
lexical_analysis.html) I read that I can show Unicode character in
several ways.
\u supposedly allows me to specify the Unicode character by hex
number and the format \N{name} allows me to specify by Unicode
name.
Neither seem to work for me.
What am I doing wrong ?
Please see error output below where I am trying to show the EURO sign
(http://www.fileformat.info/info/unicode/char/20ac/index.htm):
Python 3.0 (r30:67507, Dec 3 2008, 20:14:27) [MSC v.1500 32 bit
(Intel)] on win32
Type help, copyright, credits or license for more information.
print('\u20ac')
Traceback (most recent call last):
File stdin, line 1, in module
File c:\python30\lib\io.py, line 1491, in write
b = encoder.encode(s)
File c:\python30\lib\encodings\cp437.py, line 19, in encode
return codecs.charmap_encode(input,self.errors,encoding_map)[0]
UnicodeEncodeError: 'charmap' codec can't encode character '\u20ac' in
position 0: character maps to undefined
print (\N{EURO SIGN})
Traceback (most recent call last):
File stdin, line 1, in module
File c:\python30\lib\io.py, line 1491, in write
b = encoder.encode(s)
File c:\python30\lib\encodings\cp437.py, line 19, in encode
return codecs.charmap_encode(input,self.errors,encoding_map)[0]
UnicodeEncodeError: 'charmap' codec can't encode character '\u20ac' in
position 0: character maps to undefined
I have this same issue on Windows.
Note that on Python 2.6 it works:
Python 2.6.1 (r261:67517, Dec 4 2008, 16:51:00) [MSC v.1500 32 bit
(Intel)] on
win32
Type help, copyright, credits or license for more information.
print unicode('\u20ac')
\u20ac
This is pretty serious, IMHO, since breaks any Windows software
priting unicode to stdout.
I've filed an issue on the Python bug tracker:
http://bugs.python.org/issue5081
--- Giampaolo
http://code.google.com/p/pyftpdlib/
--
http://mail.python.org/mailman/listinfo/python-list
Re: optparse question
If you mean with / as the option designator instead of -: there doesn't appear to be a documented way of doing it. You would have to do some social engineering on the users to get them used to doing dir -s -b. In any case I thought the number of Windows users who know how to fire up a Command Prompt window was diminishingly small ... you actually have users who know how to use commands like dir /s /b? I used dir /s /b as a trivial Windows example. I use Windows for personal use but Ubuntu for work and programming. Personally, I use dir /s /b all the time on Windows since the /b option finds files *much* faster; maybe 10x or 100x faster but I didn't get out a stopwatch. -- http://mail.python.org/mailman/listinfo/python-list
Re: optparse question
Thorsten Kampe wrote: * Pat (Mon, 26 Jan 2009 20:02:59 -0500) Up until today, I never needed to pass any arguments to a Python program. [...] getopt resolved my immediate need, but I would like to know how one could use optparse to extract out the options from something like dir /s /b. If you actually read the documentation (it's right at the top) you knew that this is not possible: There are many different syntaxes for options; the traditional Unix syntax is a hyphen (“-“) followed by a single letter [...] The GNU project introduced -- [...] These are the only two option syntaxes provided by optparse. Some other option syntaxes that the world has seen include: [...] a slash followed by a letter, or a few letters, or a word, e.g. /f, /file These option syntaxes are not supported by optparse, and they never will be. This is deliberate: [...] the last only makes sense if you’re exclusively targeting VMS, MS-DOS, and/or Windows. Thorsten Sigh. I used dir /s /b as a simple Windows command with a flag (it could have been dir /s) because it was the first thing that popped into my mind. I had no idea people were going to get so upset that I used a Windows example and go off on a tear. -- http://mail.python.org/mailman/listinfo/python-list
Re: unable to print Unicode characters in Python 3
On Tue, Jan 27, 2009 at 1:52 PM, Giampaolo Rodola' gne...@gmail.com wrote:
I have this same issue on Windows.
Note that on Python 2.6 it works:
Python 2.6.1 (r261:67517, Dec 4 2008, 16:51:00) [MSC v.1500 32 bit
(Intel)] on
win32
Type help, copyright, credits or license for more information.
print unicode('\u20ac')
\u20ac
Shouldn't this be
print unicode(u'\u20ac')
on 2.6? Without the 'u' prefix, 2.6 will just encode it as a normal
(byte) string and escape the backslash. In Python 3.0 you don't need
to do this because all strings are unicode to start with. I suspect
you will see the same error with 2.6 on Windows once you correct this.
(note to Giampaolo: sorry, resending this because I accidentally
selected reply instead of reply to all)
--
Denis Kasak
--
http://mail.python.org/mailman/listinfo/python-list
Re: unable to print Unicode characters in Python 3
Note that on Python 2.6 it works:
Python 2.6.1 (r261:67517, Dec 4 2008, 16:51:00) [MSC v.1500 32 bit
(Intel)] on
win32
Type help, copyright, credits or license for more information.
print unicode('\u20ac')
\u20ac
Note that in Python 2.6 it expressly *does not* work, by your own example.
Although I think the example is wrong and that you need to print u'\u20ac'
in 2.6 unless you are importing unicode_literals from __future__; otherwise
'\u20ac' is an ASCII string of 6 characters.
Works would result, I'd think, in a unicode character being actually
written to stdout: that is not happening. Instead a backslash pattern of
ASCII characters meant to represent a Unicode character that -can't- be
written to that stream are being written to stdout. The two aren't even kind
of the same: but this is hardly something Python has a lot of control
over... Windows software printing unicode to stdout was always a bit broken.
IF you set the code page you could print some -- and IF you changed the font
on the command prompt to a /non/-default font you could actually display
others -- but it really is sort of a sucky situation, Unicode in Console
windows on Windows.
I really don't know how Python could do it better here: between the default
code page on Windows being completely lame, the default font not supporting
Unicode really... ISTM that having cross-platform apps which output unicode
(really UTF8 probably) to stdout are just not really doable. But if you
really want to you can always rebind sys.stdout with an error mode of
backslashreplace or xmlcharrefreplace (which I do in one situation where
I have a subprocess that has to output 'unicode' to a parent process)
instead of 'strict'.
--Stephen
--
http://mail.python.org/mailman/listinfo/python-list
Re: optparse question
On Jan 28, 12:06 am, Pat p...@junk.net wrote: Thorsten Kampe wrote: * Pat (Mon, 26 Jan 2009 20:02:59 -0500) Up until today, I never needed to pass any arguments to a Python program. [...] getopt resolved my immediate need, but I would like to know how one could use optparse to extract out the options from something like dir /s /b. If you actually read the documentation (it's right at the top) you knew that this is not possible: There are many different syntaxes for options; the traditional Unix syntax is a hyphen (“-“) followed by a single letter [...] The GNU project introduced -- [...] These are the only two option syntaxes provided by optparse. Some other option syntaxes that the world has seen include: [...] a slash followed by a letter, or a few letters, or a word, e.g. /f, /file These option syntaxes are not supported by optparse, and they never will be. This is deliberate: [...] the last only makes sense if you’re exclusively targeting VMS, MS-DOS, and/or Windows. Thorsten Sigh. I used dir /s /b as a simple Windows command with a flag (it could have been dir /s) because it was the first thing that popped into my mind. I had no idea people were going to get so upset that I used a Windows example and go off on a tear. Nobody is upset, and nobody has gone off on a tear. The point about the Windows example is that the docs say in a close-to-screamingly- obvious manner that /options are not supported, no matter what religion uses them. It was not, and still is not, apparent what you really wanted. We're all patiently waiting for you to rephrase the question(s). -- http://mail.python.org/mailman/listinfo/python-list
Re: socket.unbind or socket.unlisten? - socket.error: (48, 'Address already in use')
On Tue, 27 Jan 2009 10:49:03 +0100, Laszlo Nagy gand...@shopzeus.com wrote: I have a program that uses socket.bind() and socket.listen() frequently. After that program stops, it is not able to bind() again for a while: File /home/gandalf/Python/Lib/orb/accesspoints/srvtcp.py, line 27, in __init__ self.serversocket.bind((self.listen_address,self.port)) File string, line 1, in bind socket.error: (48, 'Address already in use') The problem with this, is that this server program SOMETIMES need to be restarted very quickly. I tried to find the solution in the socket module. But there is no socket.unbind or socket.unlisten. How can I tell the OS that I do not want to listen on that address anymore, so other programs can bind on it immediatelly? (Yes I know that I can use setsockopt to allow listening multiple sockets on the same address, but this is NOT what I need...) Actually, SO_REUSEADDR is probably just what you want. Since I can't see your code and I don't know under what situations it fails, I can only guess at the problem, but my guess is that you have connections from the first run of your app left in the TIME_WAIT state and they are preventing you from binding to the address again in the second run of your app. Setting the SO_REUSEADDR flag on POSIX fixes this problem (don't set it on Windows, though). Jean-Paul -- http://mail.python.org/mailman/listinfo/python-list
Re: unable to print Unicode characters in Python 3
On Jan 27, 11:52 pm, Giampaolo Rodola' gne...@gmail.com wrote:
On 26 Gen, 19:16, jefm jef.mangelsch...@gmail.com wrote:
Hi,
while checking out Python 3, I read that all text strings are now
natively Unicode.
In the Python language reference (http://docs.python.org/3.0/reference/
lexical_analysis.html) I read that I can show Unicode character in
several ways.
\u supposedly allows me to specify the Unicode character by hex
number and the format \N{name} allows me to specify by Unicode
name.
Neither seem to work for me.
What am I doing wrong ?
Please see error output below where I am trying to show the EURO sign
(http://www.fileformat.info/info/unicode/char/20ac/index.htm):
Python 3.0 (r30:67507, Dec 3 2008, 20:14:27) [MSC v.1500 32 bit
(Intel)] on win32
Type help, copyright, credits or license for more information.
print('\u20ac')
Traceback (most recent call last):
File stdin, line 1, in module
File c:\python30\lib\io.py, line 1491, in write
b = encoder.encode(s)
File c:\python30\lib\encodings\cp437.py, line 19, in encode
return codecs.charmap_encode(input,self.errors,encoding_map)[0]
UnicodeEncodeError: 'charmap' codec can't encode character '\u20ac' in
position 0: character maps to undefined
print (\N{EURO SIGN})
Traceback (most recent call last):
File stdin, line 1, in module
File c:\python30\lib\io.py, line 1491, in write
b = encoder.encode(s)
File c:\python30\lib\encodings\cp437.py, line 19, in encode
return codecs.charmap_encode(input,self.errors,encoding_map)[0]
UnicodeEncodeError: 'charmap' codec can't encode character '\u20ac' in
position 0: character maps to undefined
I have this same issue on Windows.
Note that on Python 2.6 it works:
Python 2.6.1 (r261:67517, Dec 4 2008, 16:51:00) [MSC v.1500 32 bit
(Intel)] on
win32
Type help, copyright, credits or license for more information.
print unicode('\u20ac')
\u20ac
This is pretty serious, IMHO, since breaks any Windows software
priting unicode to stdout.
I've filed an issue on the Python bug tracker:http://bugs.python.org/issue5081
Hello hello -- (1) that's *not* attempting to print Unicode. Look at
your own output ... \u20ac was printed, not a euro character!!!
With 2.X for *any* X:
guff ='\u20ac'
type(guff)
type 'str'
len(guff)
6
(2) Printing Unicode to a Windows console has never *worked*; that's
why this thread was pursuing the faint ray of hope offered by cp65001.
--
http://mail.python.org/mailman/listinfo/python-list
A Twisted Design Decision
Twisted, being twisted in its behavior is causing quite a lot of confusion in design decisions. I will put forward a comparison of reactor and non-reactor patterns. The code is not exact - whatever is shown is the gist of it. For example, a message handler - in a usual scenario: class messageHandler: def run(): msg = self.get_next_msg() if not msg.send(): self.handle_failure() To handle parallel execution, we will have to use threads, but the code flow is similar. How do we do the same in a reactor pattern (Twisted)? msg.send will cause a deferred to be raised - the failure, if it happens will happen much later. i.e. other than sending messageHandler object in msg.send(), I cannot see any mechanism of running handle_failure. In Twisted: class messageHandler: def run(): msg = self.get_next_msg() msg.send(self): class msgClass: def send(o): d = deferred.addCallBack(success_handler, o).addErrBack (failure_handler, o) def failure_handler(o): o.handle_failure() Basically, what I find is that a lot of functional encapsulation is now lost by following reactor pattern. handle_failure is messageHandlers code and makes for pretty viewing if called from inside messageHandler itself. But, due to the twisted nature of reactor pattern, the msg Class - who is functionally a lower class to messageHandler invoking messageHandler's code. Is there a way to solve this in a more beautiful way? Am I missing something here? -- http://mail.python.org/mailman/listinfo/python-list
Re: A Twisted Design Decision
On Tue, 27 Jan 2009 05:46:25 -0800 (PST), koranthala koranth...@gmail.com wrote: Twisted, being twisted in its behavior is causing quite a lot of confusion in design decisions. I'm not sure I agree with your premise. ;) I will put forward a comparison of reactor and non-reactor patterns. The code is not exact - whatever is shown is the gist of it. For example, a message handler - in a usual scenario: class messageHandler: def run(): msg = self.get_next_msg() if not msg.send(): self.handle_failure() To handle parallel execution, we will have to use threads, but the code flow is similar. How do we do the same in a reactor pattern (Twisted)? msg.send will cause a deferred to be raised - the failure, if it happens will happen much later. i.e. other than sending messageHandler object in msg.send(), I cannot see any mechanism of running handle_failure. In Twisted: class messageHandler: def run(): msg = self.get_next_msg() msg.send(self): class msgClass: def send(o): d = deferred.addCallBack(success_handler, o).addErrBack (failure_handler, o) def failure_handler(o): o.handle_failure() This doesn't look like a correct or faithful translation of the original. Here are two possibilities. First: class messageHandler: def run(): msg = self.get_next_msg() d = msg.send() def cbSendFailed(result): if not result: self.handle_failure() d.addErrback(cbSendFailed) return d Next: class messageHandler: @inlineCallbacks def run(): msg = self.get_next_msg() if not (yield msg.send()): self.handle_failure() These are both just straight translations from your version so as to be able to handle a Deferred from `msg.send´. Basically, what I find is that a lot of functional encapsulation is now lost by following reactor pattern. handle_failure is messageHandlers code and makes for pretty viewing if called from inside messageHandler itself. But, due to the twisted nature of reactor pattern, the msg Class - who is functionally a lower class to messageHandler invoking messageHandler's code. You don't need to lose anything. I don't know what your motivation was for re-arranging the code when you wrote the Twisted version, but it doesn't appear to have been necessary. Is there a way to solve this in a more beautiful way? Am I missing something here? Hope this helps, Jean-Paul -- http://mail.python.org/mailman/listinfo/python-list
Re: print formating for matrix/table
You could try SimpleTable: http://code.google.com/p/econpy/source/browse/trunk/utilities/text.py fwiw, Alan Isaac -- http://mail.python.org/mailman/listinfo/python-list
Python-URL! - weekly Python news and links (Jan 27)
QOTW: Whatever sufficiently sophisticated topic was ... initially discussed it ends all up in a request for removing reference counting and the GIL. - Kay Schluehr http://groups.google.com/group/comp.lang.python/msg/6a152ff76cf313ff Looking for a different kind of (editor|environment|interfase) like TextCalc for Python: http://groups.google.com/group/comp.lang.python/t/195ebd77f9e191e2/ Inheritance, encapsulation, and hungarian notation: http://groups.google.com/group/comp.lang.python/t/e6fc603109b42b62/ True, False, None, and the == and is operators: http://groups.google.com/group/comp.lang.python/t/21cc0e59bb59c7f1/ Mixing True/False and ints can confuse: http://groups.google.com/group/comp.lang.python/t/3185626fca2feb9b/ A short (but very interesting) essay on names, expressions, variables, and binding, by Mark Wooding: http://groups.google.com/group/comp.lang.python/t/3efb017e757bf3d9/ Using the struct module to handle variable-sized data types: http://groups.google.com/group/comp.lang.python/t/de5d94ffd953eaba/ Experienced Pythonistas give advice on improving programming skills: http://groups.google.com/group/comp.lang.python/t/4929f2681088730d/ Kaspersky mentions Python as vector for handset infection: http://www.theregister.co.uk/2009/01/22/symbian_trojan/ Running Python code on the client side from a web app: http://groups.google.com/group/comp.lang.python/t/e8131fc8a29db75c/ A new Counter class (similar to bag/multiset in other languages) was added to the collections module: http://groups.google.com/group/comp.lang.python/t/debefb159cd0752d/ The longest thread until now, started previous week. Now discussing enforced data hiding and the Scada language, team management, and who knows what (I gave up!) http://groups.google.com/group/comp.lang.python/t/68bc54bca830c46/ Another very long thread: RPython and PyPy advantages, the GIL, concurrency issues on modern CPU architectures, and removing the GIL (again!): http://groups.google.com/group/comp.lang.python/t/d8f15fad0638bca/ Everything Python-related you want is probably one or two clicks away in these pages: Python.org's Python Language Website is the traditional center of Pythonia http://www.python.org Notice especially the master FAQ http://www.python.org/doc/FAQ.html PythonWare complements the digest you're reading with the marvelous daily python url http://www.pythonware.com/daily Just beginning with Python? This page is a great place to start: http://wiki.python.org/moin/BeginnersGuide/Programmers The Python Papers aims to publish the efforts of Python enthusiats: http://pythonpapers.org/ The Python Magazine is a technical monthly devoted to Python: http://pythonmagazine.com Readers have recommended the Planet sites: http://planetpython.org http://planet.python.org comp.lang.python.announce announces new Python software. Be sure to scan this newsgroup weekly. http://groups.google.com/group/comp.lang.python.announce/topics Python411 indexes podcasts ... to help people learn Python ... Updates appear more-than-weekly: http://www.awaretek.com/python/index.html The Python Package Index catalogues packages. http://www.python.org/pypi/ The somewhat older Vaults of Parnassus ambitiously collects references to all sorts of Python resources. http://www.vex.net/~x/parnassus/ Much of Python's real work takes place on Special-Interest Group mailing lists http://www.python.org/sigs/ Python Success Stories--from air-traffic control to on-line match-making--can inspire you or decision-makers to whom you're subject with a vision of what the language makes practical. http://www.pythonology.com/success The Python Software Foundation (PSF) has replaced the Python Consortium as an independent nexus of activity. It has official responsibility for Python's development and maintenance. http://www.python.org/psf/ Among the ways you can support PSF is with a donation. http://www.python.org/psf/donations/ The Summary of Python Tracker Issues is an automatically generated report summarizing new bugs, closed ones, and patch submissions. http://search.gmane.org/?author=status%40bugs.python.orggroup=gmane.comp.python.develsort=date Although unmaintained since 2002, the Cetus collection of Python hyperlinks retains a few gems. http://www.cetus-links.org/oo_python.html Python FAQTS http://python.faqts.com/ The Cookbook is a collaborative effort to capture useful and
Re: Doc for extended call syntax; was: Re: unzip array of arrays?
Mark Wooding wrote: Steve Holden writes: No, you aren't mistaken. Looking at the * symbol in the 2.6 documentation index it lists only two references. The first is the language manual's explanation of its use in the def statement, the second is a transitory reference to its use in function calls, but that's in the tutorial where it is not likely to get much attention. There's a full description of it in 5.4.3 in the Language Reference, but apparently not indexed. So I guess this means I can duck out of writing up a lecture on my own understanding of Python's extended call syntax. Great. I think I grock the extended call syntax, and when the question came up I was surprised not to be able to find where I learned it. Mark, where exactly does one look to see this full description? -- --Bryan -- http://mail.python.org/mailman/listinfo/python-list
Re: Does Python really follow its philosophy of Readability counts?
On Tuesday 27 January 2009 04:39:02 am Bruno Desthuilliers wrote: Still not. But it's interesting to note that you consider everyone disagreeing with you as basically the same person. Hehe. At the beginning of this thread, I also thought that Russ P. and Paul Robin were the same person. I have serious problems with names. [My apologies to both of you, if I said something that made you notice my confusion]. P.S: Just to be clear, I'm neither Russ P. nor Paul Robin :D -- Luis Zarrabeitia (aka Kyrie) Fac. de Matemática y Computación, UH. http://profesores.matcom.uh.cu/~kyrie -- http://mail.python.org/mailman/listinfo/python-list
Re: var is None vs. var == None
On Fri, 2009-01-23 at 19:31 -0500, Benjamin Kaplan wrote: On Fri, Jan 23, 2009 at 7:28 PM, Gary Herron gher...@islandtraining.com wrote: Steven D'Aprano wrote: On Fri, 23 Jan 2009 14:58:34 -0500, Gerald Britton wrote: Hi -- Some time ago I ran across a comment recommending using var is None instead of var == None (also var is not None, etc.) That entirely depends on whether you wish to test for something which *is* None or something with *equals* None. Those two things have different meanings. Actually, for None, those two things *are* the same. If something *equals* None, it also *is* None. This is a consequence of the fact that there is only ever one value of None anywhere in the system. Not if someone decided to be a PITA. class A(object) : ...def __eq__(self, other) : ... return other is None ... a = A() a == None True a is None False or slightly less PITAish: class EqualThing(object): def __eq__(self, other): return True Could be a useful sentinel value in some cases. I wonder, do newbies actually get the impression from somewhere that is is a synonym for ==? Yes. Such questions pop up regularly, and are usually dealt with quickly. My own testing indicates that the former beats the latter by about 30% on average. Not a log for a single instruction but it can add up in large projects. If you have a large project where the time taken to do comparisons to None is a significant portion of the total time, I'd be very surprised. var is None is a micro-optimization, but that's not why we do it. We do it because usually the correct test is whether var *is* None and not merely equal to None. Any random object might happen to equal None (admittedly most objects don't), but only None is None. You don't have that quite right. The only way something can *equal* None is if it *is* None. None is not a value an object can have, but rather it is a (singleton) object that can be referenced. Setting something *equal* to None is accomplished by making it refer to the single None object, at which point it *is* None. Gary Herron -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: Process crash with no reason
On Jan 27, 2009, at 7:00 AM, gil.shi...@gmail.com wrote: On Jan 26, 8:40 pm, Philip Semanchuk phi...@semanchuk.com wrote: On Jan 26, 2009, at 1:13 PM, gil.shi...@gmail.com wrote: Hi All, I'm running a program that is acting as a nice interface to sybase' replication server. The program is using the cherrypy web service for the GUI. The process is crashing every few days with no reason. In the log I can see INFO and DEBUG (No ERROR) log lines and I do not get any TraceBack python's message. This program is running on solaris 9 machine. Where can I see or what can I do in order to find out what causes the process to crash? I have tried simulating a traceBack message and I could see this traceback message in one of the log files I'm using. When the process crashes without my help, I don't have a clue. Let me know if you need any other info Although Python isn't immune to fatal errors like you describe, I'd immediately suspect a 3rd-party module instead, esp. one written in C or C++. Are you using anything like that? No I do not. But you're using CherryPy, aren't you? And as Tim Golden pointed out, you're probably using another 3rd party lib to talk to Sybase. ISTR that CherryPy is written in pure Python but if you have a database adapter lib it probably isn't. Is there a way to monitor who had killed my process? That's more of a Solaris question than a Python one, and I don't know much about Solaris. Is there a system log where Solaris records when why it has killed errant processes? -- http://mail.python.org/mailman/listinfo/python-list
How many followers of comp.lang.python
I curious of how many are really out there. I have been watching the list for some time but basically see the same 10 or so people answering questions. Reply to this message so we can see how many exists here Thanks -- http://mail.python.org/mailman/listinfo/python-list
Re: How many followers of comp.lang.python
On Jan 27, 9:07 am, rantingrick rantingr...@gmail.com wrote: I curious of how many are really out there. I have been watching the list for some time but basically see the same 10 or so people answering questions. Reply to this message so we can see how many exists here Thanks I'm not sure how you arrived at that low number. If you go to the main page on the Google Groups version, you'll count at least 20 on page 1: http://groups.google.com/group/comp.lang.python/topics Mike -- http://mail.python.org/mailman/listinfo/python-list
Re: How many followers of comp.lang.python
I also looked at Guido's profile and he has not posted a message here since 2000. WOW! I know he way ahead of us here but why has he not drooped in for a chat with the python community? Matz(the creator of Ruby), is a regular at comp.lang.ruby. This makes me wonder if Guido thinks comp.lang.python is a dead Parrot (but there could be other reasons?) -- http://mail.python.org/mailman/listinfo/python-list
creating a pattern using a previous match and a count of the number of '('s in it
code
I'm new to regexs and trying to get a list of all my C++ methods with balanced
parenthesis as follows.
#find all c++ method prototypes with a '::' in the middle
#upto and including the 1st closing parenthesis
pattern_upto_1st_closed_parenth = re.compile('\w+::\w+\([^)]*\)')
match_upto_1st_closed_parenth=
re.findall(pattern_upto_1st_closed_parenth,txt)
num_of_protos = len(match_upto_1st_closed_parenth)
for i in range (0,num_of_protos-1):
num_of_open_parenths = match_upto_1st_closed_parenth[i].count('(')
#expand the pattern to get all of the prototype
#ie upto the last closed parenthesis
#saying something like
pattern = re.compile(\
'match_upto_1st_closed_parenth[i]+\
(([^)]*\)){num_of_open_parenths-1}'\
)
#
#HELP!! I'm not sure how to incorporate:
#1 'match_upto_1st_closed_parenth[i]' into the above extended pattern???
#2 the count 'num_of_open_parenths' instead of a literal ???
#
#===
#if I could do it this sort of this would appear to offer the neatest solution
pattern_upto_last_balanced_parenthesis = re.compile('
(\w+::\w+\([^)]*\))\
([^)]*\)){\1.count('(')-1}
')
#===
Should I be using regexs to do this?
I've only put \ line extensions to separate the pattern components to assist
readability
Thx
/code
--
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Re: Process crash with no reason
On Jan 27, 2:10 pm, Tim Golden m...@timgolden.me.uk wrote: gil.shi...@gmail.com wrote: On Jan 26, 8:40 pm, Philip Semanchuk phi...@semanchuk.com wrote: On Jan 26, 2009, at 1:13 PM, gil.shi...@gmail.com wrote: Hi All, I'm running a program that is acting as a nice interface to sybase' replication server. The program is using the cherrypy web service for the GUI. The process is crashing every few days with no reason. In the log I can see INFO and DEBUG (No ERROR) log lines and I do not get any TraceBack python's message. This program is running on solaris 9 machine. Where can I see or what can I do in order to find out what causes the process to crash? I have tried simulating a traceBack message and I could see this traceback message in one of the log files I'm using. When the process crashes without my help, I don't have a clue. Let me know if you need any other info Although Python isn't immune to fatal errors like you describe, I'd immediately suspect a 3rd-party module instead, esp. one written in C or C++. Are you using anything like that? No I do not. Then how are you interacting with Sybase? TJG I'm using python's functions to run sybase sql commands. Thanks -- http://mail.python.org/mailman/listinfo/python-list
Re: Why GIL? (was Re: what's the point of rpython?)
Paul Rubin wrote: Bryan Olson fakeaddr...@nowhere.org writes: An object's __dict__ slot is *not* mutable; thus we could gain some efficiency by protecting the object and its dict with the same lock. I do not see a major win in Mr. Banks' point that we do not need to lock the object, just its dict. If the dict contents don't change often, maybe we could use an STM-like approach to eliminate locks when reading. That would of course require rework to just about every C function that accesses Python objects. I'm a fan of lock-free data structure and software transactional memory, but I'm also a realist. Heck, I'm one of this group's outspoken advocates of threaded architectures. Theoretical breakthroughs will happen, but in real world of today, threads are great but GIL-less Python is a loser. Wherever Python is going, let's recognize that a scripting language that rocks is better than any other kind of language that sucks. -- --Bryan -- http://mail.python.org/mailman/listinfo/python-list
Re: Process crash with no reason
On Jan 27, 5:00 pm, Philip Semanchuk phi...@semanchuk.com wrote: On Jan 27, 2009, at 7:00 AM, gil.shi...@gmail.com wrote: On Jan 26, 8:40 pm, Philip Semanchuk phi...@semanchuk.com wrote: On Jan 26, 2009, at 1:13 PM, gil.shi...@gmail.com wrote: Hi All, I'm running a program that is acting as a nice interface to sybase' replication server. The program is using the cherrypy web service for the GUI. The process is crashing every few days with no reason. In the log I can see INFO and DEBUG (No ERROR) log lines and I do not get any TraceBack python's message. This program is running on solaris 9 machine. Where can I see or what can I do in order to find out what causes the process to crash? I have tried simulating a traceBack message and I could see this traceback message in one of the log files I'm using. When the process crashes without my help, I don't have a clue. Let me know if you need any other info Although Python isn't immune to fatal errors like you describe, I'd immediately suspect a 3rd-party module instead, esp. one written in C or C++. Are you using anything like that? No I do not. But you're using CherryPy, aren't you? And as Tim Golden pointed out, you're probably using another 3rd party lib to talk to Sybase. ISTR that CherryPy is written in pure Python but if you have a database adapter lib it probably isn't. Is there a way to monitor who had killed my process? That's more of a Solaris question than a Python one, and I don't know much about Solaris. Is there a system log where Solaris records when why it has killed errant processes? Yes I am using CherryPy. One of the developers I'm working with thinks it is a cherrypy issue. Our python process has nothing to do if cherrypy is stuck or down. But still, it is strange that there are no leftovers from the crashed process. Solaris has system logs that has nothing in them about this process. Any other suggestion will be great. Thanks -- http://mail.python.org/mailman/listinfo/python-list
Re: How many followers of comp.lang.python
Seems like the only thing people are interested in is bickering and name calling. I noticed the post Does Python really follow... has over 400 post mainly from the same 10 people. Maybe this is why Guido no longer wishes to be a part of this group. Where is the sense of community here? Anybody care to correct me, because i would love to be wrong about this, but i fear i am 100% correct. -- http://mail.python.org/mailman/listinfo/python-list
Re: How many followers of comp.lang.python
On Jan 27, 9:17 am, rantingrick rantingr...@gmail.com wrote: I also looked at Guido's profile and he has not posted a message here since 2000. WOW! I know he way ahead of us here but why has he not drooped in for a chat with the python community? Matz(the creator of Ruby), is a regular at comp.lang.ruby. This makes me wonder if Guido thinks comp.lang.python is a dead Parrot (but there could be other reasons?) I've seen him on the distutils list, but I think he generally keeps to the dev lists mostly. This list is for general users (i.e. mostly newbs). We do get some good discussions going on more esoteric subjects like memoization, but for the most part, it's posts like how do I do x if y is z, what's the best Python IDE, which is the best Python GUI toolkit, I hate the GIL, what's a web framework, etc. I think Guido has better things to do...and his employer probably doesn't want him spending all day answering stuff like that. Mike -- http://mail.python.org/mailman/listinfo/python-list
Re: How many followers of comp.lang.python
On Tue, Jan 27, 2009 at 10:42 AM, rantingrick rantingr...@gmail.com wrote: Seems like the only thing people are interested in is bickering and name calling. I noticed the post Does Python really follow... has over 400 post mainly from the same 10 people. Maybe this is why Guido no longer wishes to be a part of this group. Where is the sense of community here? Anybody care to correct me, because i would love to be wrong about this, but i fear i am 100% correct. there is a sense of community here. It just doesn't extend to everyone joining in the flame war. That particular thread moved from talking about difficult to read python code to a not very friendly debate about whether Python needs to have enforced data hiding to be a good language. After the first couple hundred posts and when the name calling started, I, for one, started ignoring those posts. -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: socket.unbind or socket.unlisten? - socket.error: (48, 'Address already in use')
Jean-Paul Calderone ex.@di..od.com wrote: 8-- ... Setting the SO_REUSEADDR flag on POSIX fixes this problem (don't set it on Windows, though). Why not? I have been merrily setting it, and I have not noticed anything weird. (yet) - Hendrik -- http://mail.python.org/mailman/listinfo/python-list
Re: Does Python really follow its philosophy of Readability counts?
Luis Zarrabeitia k@uh.cu wrote: 8 Hehe. At the beginning of this thread, I also thought that Russ P. and Paul Robin were the same person. I have serious problems with names. *nods in agreement, because the man's surname is Rubin, not Robin* :-) - Hendrik -- http://mail.python.org/mailman/listinfo/python-list
Re: creating a pattern using a previous match and a count of the number of '('s in it
me wrote:
code
I'm new to regexs and trying to get a list of all my C++ methods with balanced
parenthesis as follows.
#find all c++ method prototypes with a '::' in the middle
#upto and including the 1st closing parenthesis
pattern_upto_1st_closed_parenth = re.compile('\w+::\w+\([^)]*\)')
match_upto_1st_closed_parenth=
re.findall(pattern_upto_1st_closed_parenth,txt)
num_of_protos = len(match_upto_1st_closed_parenth)
for i in range (0,num_of_protos-1):
This should actually be range(0, num_of_protos).
num_of_open_parenths = match_upto_1st_closed_parenth[i].count('(')
#expand the pattern to get all of the prototype
#ie upto the last closed parenthesis
#saying something like
pattern = re.compile(\
'match_upto_1st_closed_parenth[i]+\
(([^)]*\)){num_of_open_parenths-1}'\
)
#
#HELP!! I'm not sure how to incorporate:
#1 'match_upto_1st_closed_parenth[i]' into the above extended pattern???
#2 the count 'num_of_open_parenths' instead of a literal ???
#
#===
#if I could do it this sort of this would appear to offer the neatest solution
pattern_upto_last_balanced_parenthesis = re.compile('
(\w+::\w+\([^)]*\))\
([^)]*\)){\1.count('(')-1}
')
#===
Should I be using regexs to do this?
I've only put \ line extensions to separate the pattern components to assist
readability
Thx
/code
Not necessarily the best way, but:
methods = []
# The pattern for the start of the method's header.
start_pattern = re.compile(r'\w+::\w+\([^)]*\)')
# Start at the beginning of the text.
pos = 0
while True:
# Search for the start of the next method's header.
start_match = start_pattern.search(txt, pos)
if not start_match:
break
# Search for the end of the method's header.
end_pattern = re.compile(r'(?:[^)]*\)){%d}' %
start_match.group().count('('))
end_match = end_pattern.search(txt, pos)
methods.append(txt[start_match.start() : end_match.end()])
# Continue the next search from where we left off.
pos = end_match.end()
--
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Re: Process crash with no reason
On Jan 27, 2009, at 10:34 AM, gil.shi...@gmail.com wrote: On Jan 27, 2:10 pm, Tim Golden m...@timgolden.me.uk wrote: gil.shi...@gmail.com wrote: On Jan 26, 8:40 pm, Philip Semanchuk phi...@semanchuk.com wrote: On Jan 26, 2009, at 1:13 PM, gil.shi...@gmail.com wrote: Hi All, I'm running a program that is acting as a nice interface to sybase' replication server. The program is using the cherrypy web service for the GUI. The process is crashing every few days with no reason. In the log I can see INFO and DEBUG (No ERROR) log lines and I do not get any TraceBack python's message. This program is running on solaris 9 machine. Where can I see or what can I do in order to find out what causes the process to crash? I have tried simulating a traceBack message and I could see this traceback message in one of the log files I'm using. When the process crashes without my help, I don't have a clue. Let me know if you need any other info Although Python isn't immune to fatal errors like you describe, I'd immediately suspect a 3rd-party module instead, esp. one written in C or C++. Are you using anything like that? No I do not. Then how are you interacting with Sybase? I'm using python's functions to run sybase sql commands. Can you give a short code sample? I'm unaware of how one would use the standard Python library to talk to Sybase, unless Sybase has a raw socket interface or some such. -- http://mail.python.org/mailman/listinfo/python-list
Re: How many followers of comp.lang.python
On Jan 27, 9:43 am, Mike Driscoll kyoso...@gmail.com wrote: I think Guido has better things to do...and his employer probably doesn't want him spending all day answering stuff like that. Mike I totally agree, and i would never expect him to field noob questions but i just thought it odd he has not dropped by in over 9 years. I have seen his blog but i wonder why he does not blog here. Seems like the best place in the world to get feedback from Python users is here. He could start some very interesting subjects. To at least, this medium is more of a personal exchange, than a blog. -- http://mail.python.org/mailman/listinfo/python-list
Re: USB in python
On 2009-01-27, Lie Ryan lie.1...@gmail.com wrote: From the little I know on electronics, a simple, single transistor would (almost) immediately switch from on-to-off-to-on depending on the voltage of the control pin (I think it was the middle pin). I was suggesting this simplistic hack because as far as I comprehend the OP's need, he only need on-off switch instead of a complex multiple output bits. The audio output jack outputs AC (alternating current). If you put AC into a transistor, you get AC out. Hence the need for a rectifier/detector to convert the AC signal into a DC level. To reliably get an on-off state from an analog DC level, you need something with some hystersis (e.g. a comparitor). Depending on the requirements it may possible to do impliment a comparitor with hysteresis using a single transistor. If you're looking for a digital output signal whose DC level you can contol, then either the printer port or the serial port is a better option than using the sound-card's line-out which is an analog AC output. I don't know how much power can be pulled from jack out, Almost none, and what's there is very low voltage. That's why the power is taken from USB port. but for a home brewn device it is still feasible to draw power from USB and signal from jack out. It would probably be easier to buy a USB-parallel port chip. Then he's got power from the USB bus and something like 14 parallel I/O pins he can control. Alternatively A USB-serial chip will provide 2 outputs and 4 inputs. The idea was made on the basis that a USB microcontroller is not used. I didn't say anything about using a USB microcontroller. There are dead-simple and cheap USB-serial and USB-parallel chips that you can buy that provide the equivalent of a serial port or parallel printer port via USB. Getting power from USB should be much easier than getting data Using a USB-serial or USB-parallel chip isn't really much harder than getting power from the USB port, and it's simpler than building a detector/comparity circuit to connect to the audio line-out. while the jack out can provide simple on-off signal. With the addition of a rectifier/detector and an appropriate comparitor circuit, yes. -- Grant Edwards grante Yow! Civilization is fun! at Anyway, it keeps me busy!! visi.com -- http://mail.python.org/mailman/listinfo/python-list
Re: How many followers of comp.lang.python
rantingrick a écrit : On Jan 27, 9:43 am, Mike Driscoll kyoso...@gmail.com wrote: I think Guido has better things to do...and his employer probably doesn't want him spending all day answering stuff like that. Mike I totally agree, and i would never expect him to field noob questions but i just thought it odd he has not dropped by in over 9 years. All you can say is that he didn't *post* here (at least under his real identity...) for the 9 past years - this doesn't mean he never *reads* (and this, you just have no way to know). -- http://mail.python.org/mailman/listinfo/python-list
Re: How many followers of comp.lang.python
rantingrick a écrit : Seems like the only thing people are interested in is bickering and name calling. I noticed the post Does Python really follow... has over 400 post mainly from the same 10 people. There are occasionally such kind of threads, indeed. And, as Mike mentionned, the usual FAQs (some of them twice or more each week, year after year). And sometimes more interesting questions - but that does not necessarily makes long thread, so they perhaps are too low for your radar. Maybe this is why Guido no longer wishes to be a part of this group. I've been lurking here for years (about early 2000 IIRC), and don't remember a single post from the BDFL here. But: Where is the sense of community here? If you set the occasional trolls aside, this group is usually newbie-friendly and helpful one. You'll find quite a few posts by long-time, experienced and talented Python programmers (and core developpers). As far as I'm concerned, I learned (and I'm still learning) quite a lot here. Please visit comp.databases or comp.lang.javascript for really unfriendly and unhelpful places where few happens except bickering and name-calling. Anybody care to correct me, because i would love to be wrong about this, but i fear i am 100% correct. Well, why don't you just try and post a couple practical questions here? -- http://mail.python.org/mailman/listinfo/python-list
Re: A Twisted Design Decision
On Jan 27, 6:57 pm, Jean-Paul Calderone exar...@divmod.com wrote: On Tue, 27 Jan 2009 05:46:25 -0800 (PST), koranthala koranth...@gmail.com wrote: Twisted, being twisted in its behavior is causing quite a lot of confusion in design decisions. I'm not sure I agree with your premise. ;) I will put forward a comparison of reactor and non-reactor patterns. The code is not exact - whatever is shown is the gist of it. For example, a message handler - in a usual scenario: class messageHandler: def run(): msg = self.get_next_msg() if not msg.send(): self.handle_failure() To handle parallel execution, we will have to use threads, but the code flow is similar. How do we do the same in a reactor pattern (Twisted)? msg.send will cause a deferred to be raised - the failure, if it happens will happen much later. i.e. other than sending messageHandler object in msg.send(), I cannot see any mechanism of running handle_failure. In Twisted: class messageHandler: def run(): msg = self.get_next_msg() msg.send(self): class msgClass: def send(o): d = deferred.addCallBack(success_handler, o).addErrBack (failure_handler, o) def failure_handler(o): o.handle_failure() This doesn't look like a correct or faithful translation of the original. Here are two possibilities. First: class messageHandler: def run(): msg = self.get_next_msg() d = msg.send() def cbSendFailed(result): if not result: self.handle_failure() d.addErrback(cbSendFailed) return d Next: class messageHandler: @inlineCallbacks def run(): msg = self.get_next_msg() if not (yield msg.send()): self.handle_failure() These are both just straight translations from your version so as to be able to handle a Deferred from `msg.send´. Basically, what I find is that a lot of functional encapsulation is now lost by following reactor pattern. handle_failure is messageHandlers code and makes for pretty viewing if called from inside messageHandler itself. But, due to the twisted nature of reactor pattern, the msg Class - who is functionally a lower class to messageHandler invoking messageHandler's code. You don't need to lose anything. I don't know what your motivation was for re-arranging the code when you wrote the Twisted version, but it doesn't appear to have been necessary. Is there a way to solve this in a more beautiful way? Am I missing something here? Hope this helps, Jean-Paul Thank you Jean-Paul. My code is more complex than what I have mentioned. When I mentioned msg.send, the msg object actually gets the data from DB etc to send. And there are many other items being done. I will try to see whether I can change the code to incorporate what you mentioned. I rewrote most of my code after learning just raw deferreds - I had planned to study inlineCallbacks - but then it slipped my mind - now it has come to bit me. :-( -- http://mail.python.org/mailman/listinfo/python-list
Pexpect and telnet not communicating properly
I am trying to automate the following session - to talk to my router:
===
telnet speedtouch
Trying 192.168.1.254...
Connected to speedtouch.
Escape character is '^]'.
Username : Administrator
Password :
__ SpeedTouch 780
___/_/\
/ /\ 6.1.7.2
_/__ / \
_/ /\_/___ \ Copyright (c) 1999-2006, THOMSON
// / \ /\ \
___//___/\ / _\/__
/ / \ \// //\
__/ / \ \ // // _\__
/ / / \___\// // / /\
/_/__/___/ // /___/ \
\ \ \___\ \\ \ \ /
\_\ \ / /\\ \\ \___\/
\ \/ / \\ \\ /
\_/ /\\ \\/
/__/ \\ /
\ _ \ /_\/
\ //\ \/___\/
// \ \ /
\\ /___\/
\\/
_{Administrator}=?
Following commands are available :
help : Displays this help information
menu : Displays menu
?: Displays this help information
exit : Exits this shell.
.. : Exits group selection.
saveall : Saves current configuration.
ping : Send ICMP ECHO_REQUEST packets.
traceroute : Send ICMP/UDP packets to trace the ip path.
Following command groups are available :
firewallservice autopvc connection cwmp
dhcpdns dsd dyndns eth
adslatm config debug env
exprgrp hostmgr ids igmp
interface ip ipqos label language
mbusmemmmlp nat ppp
pptpscript snmpsntpsoftware
system systemlog upgrade upnpuser
voice wireless
{Administrator}=exit
I am using the following code:
#!/usr/bin/env python
import pexpect
import sys
child = pexpect.spawn('telnet 192.168.1.254')
fout = file('mylog.txt','w')
child.logfile = fout
child.expect('sername : ')
child.sendline('Administrator')
child.expect('assword : ')
child.sendline('')
child.expect('_{Administrator}=')
child.sendline('?')
child.expect('_{Administrator}=')
child.expect('exit')
This times out after child.sendline('Administrator')
mylog.txt contains:
Trying 192.168.1.254...
Connected to 192.168.1.254.
Escape character is '^]'.
Username : Administrator
Administrator
Can anyone help me in finding out what I am doing wrong?
Regards
David
--
http://mail.python.org/mailman/listinfo/python-list
Re: v = json.loads({'test':'test'})
On Sun, 2009-01-25 at 14:28 -0800, gert wrote:
On Jan 25, 11:16 pm, Дамјан Георгиевски gdam...@gmail.com wrote:
raise ValueError(errmsg(Expecting property name, s, end))
http://docs.python.org/library/json.html
What am I doing wrong ?
try this
v = json.loads('{test:test}')
JSON doesn't support single quotes, only double quotes.
the funny part is when you print(v) you get
{'test': 'test'}
Single quotes works in every browser that support json so i
recommended python should support it too, besides it looks much
cleaner
{'test': 'test'}
{test: test}
It can not be that hard to support both notation can it ?
It's not that hard, but it does add a noticeable level of complexity to
the process. In JSON, you simply tell the parser, if you see a
double-quote character, we're now parsing a string. When you see
another (unescaped) double-quote character, the string is done.
The equivalent version for your extended JSON would say, if you see a
quote character of either kind, we're parsing a string. When you see
another (unescaped) quote character of either kind, the string is done.
But that doesn't work, because it would allow {'test: test'}. So the
parser has to remember which quote character is being used, and require
those characters to be escaped, and not the other (but then does te
\'st render as rte'st or rte\'st?) and only close the string when
the appropriate quote is found.
Not an impossible task, but certainly more complex than the current
parsing requirements for JSON.
Cheers,
Cliff
--
http://mail.python.org/mailman/listinfo/python-list
Re: Counting number of objects
Kottiyath wrote: So, in a higher level class, have a weakref list which contains a reference to each person. Total count will be len(list) at any time. Now, I couldnt find a weakref list - so I am using WeakKeyDictionary with the value as None - since len(dict) also should give me the data I typically use a WeakValueDictionary, with the key id(obj). ... Now, the only two operations that I am doing are - __init__: d = weakref.WeakKeyDictionary() method y: x = aa() d[x] = None method z: total = len(d) At least at one point, the WeakValueDictionary was more stable. I don't remember the details, but I remember my work-around. If you do have troubles, try using almost the same code you now use, but substitute for the obvious lines above: d = weakref.WeakValueDictionary() and d[id(x)] = x --Scott David Daniels scott.dani...@acm.org -- http://mail.python.org/mailman/listinfo/python-list
[xlrd] sanitize the output and store in a 2d arrays
Hi gurus, Script: #!/usr/bin/python import xlrd, sys def main(toParse): workBook = xlrd.open_workbook(toParse) mySheet = workBook.sheet_by_index(0) for rownum in range(mySheet.nrows): print mySheet.row_values(rownum) if __name__ == '__main__': if len(sys.argv) 2: sys.stderr.write(Usage: %s EXCEL.XLS\n % (sys.argv[0])) else: main(sys.argv[1]) Output: myu...@testsvr:~ ./parse.py test.xls *[u'*thisislineone*'*, 343*.0]* *[u'*thisislinetwo*'*, 344*.0]* *[u'*thisislinethree*'*, 345*.0]* This is the content of my test.xls: thisislineone 343 thisislinetwo 344 thisislinethree 345 How do i remove the bold part of the output (*[u'*. *'* and *.0]* and store the output in a 2 dimensional array? Many thanks. PythonNewbie, Jay -- http://mail.python.org/mailman/listinfo/python-list
Re: Doc for extended call syntax; was: Re: unzip array of arrays?
Bryan Olson fakeaddr...@nowhere.org writes: Mark Wooding wrote: There's a full description of it in 5.4.3 in the Language Reference, but apparently not indexed. So I guess this means I can duck out of writing up a lecture on my own understanding of Python's extended call syntax. Great. I think I grock the extended call syntax, and when the question came up I was surprised not to be able to find where I learned it. Mark, where exactly does one look to see this full description? I typoed, sorry! I should have written 5.3.4: http://www.python.org/doc/2.5/ref/calls.html The description of the fancy * and ** syntax starts with `If the syntax ``*expression'' appears in the function call...'. -- [mdw] -- http://mail.python.org/mailman/listinfo/python-list
significant release for SIMPL project's Python extension
The SIMPL project (http://www.icanprogram.com/simpl) aims to bring the simplicity and power of the Send/Receive/Reply messaging (first pioneered by QNX) to the Linux world. SIMPL modules are themselves Linux executables and can be written in any number of languages now (C, C++, Tcl/Tk and Python). A SIMPL application consists of one or more of these modules interacting in a single SIMPL sandbox.A SIMPL application can consist of SIMPL modules written in a mixture of supported languages. In addtion SIMPL applications can be spread across a network seamlessly through the use of TCP/IP or RS232 surrogates.In most cases this redeployment can occur without an code change or recompilation. Python is one of the newer languages to be added to the SIMPL family, but it is already attracting significant attention.An online course on SIMPL-Python offered for no fees by iCanProgram (http:// www.icanprogram.com/06py/main.html) consistently gets the highest number of web hits in any given month. Up until now SIMPL-Python modules could already be built for deployment on a Linux OS. Now SIMPL-Python modules can be written for a non Linux OS and interact with a SIMPL application using the tclSurrogate (TCP/IP) protocol which SIMPL supports.This means that a Python script running under Windows can now participate seamlessly in a SIMPL application running on a Linux network. In addition SIMPL-Python web scripts can also now participate seamlessly in a SIMPL application.This feature greatly extends the reach of SIMPL-Python into the realm of web interfaces and web applications. The easiest way to get aquainted with the SIMPL-Python toolset is to download one of its self installing archives for Linux.These are safely deployed in /tmp to allow full exploration with an option to permanently install the release in a directory of your choosing. SIMPL-Python self installing archive - http://www.icanprogram.com/simpl/python.self.html SIMPL-Python course self installing archive - http://www.icanprogram.com/pythoncourse.self.html the SIMPL project team -- http://mail.python.org/mailman/listinfo/python-list
Re: Pexpect and telnet not communicating properly
David Anderson wrote:
I am trying to automate the following session - to talk to my router:
===
telnet speedtouch
Trying 192.168.1.254...
Connected to speedtouch.
Escape character is '^]'.
Username : Administrator
Password :
__ SpeedTouch 780
___/_/\
/ /\ 6.1.7.2
_/__ / \
_/ /\_/___ \ Copyright (c) 1999-2006, THOMSON
// / \ /\ \
___//___/\ / _\/__
/ / \ \// //\
__/ / \ \ // // _\__
/ / / \___\// // / /\
/_/__/___/ // /___/ \
\ \ \___\ \\ \ \ /
\_\ \ / /\\ \\ \___\/
\ \/ / \\ \\ /
\_/ /\\ \\/
/__/ \\ /
\ _ \ /_\/
\ //\ \/___\/
// \ \ /
\\ /___\/
\\/
_{Administrator}=?
Following commands are available :
help : Displays this help information
menu : Displays menu
?: Displays this help information
exit : Exits this shell.
.. : Exits group selection.
saveall : Saves current configuration.
ping : Send ICMP ECHO_REQUEST packets.
traceroute : Send ICMP/UDP packets to trace the ip path.
Following command groups are available :
firewallservice autopvc connection cwmp
dhcpdns dsd dyndns eth
adslatm config debug env
exprgrp hostmgr ids igmp
interface ip ipqos label language
mbusmemmmlp nat ppp
pptpscript snmpsntpsoftware
system systemlog upgrade upnpuser
voice wireless
{Administrator}=exit
I am using the following code:
#!/usr/bin/env python
import pexpect
import sys
child = pexpect.spawn('telnet 192.168.1.254')
fout = file('mylog.txt','w')
child.logfile = fout
child.expect('sername : ')
child.sendline('Administrator')
child.expect('assword : ')
child.sendline('')
child.expect('_{Administrator}=')
child.sendline('?')
child.expect('_{Administrator}=')
child.expect('exit')
This times out after child.sendline('Administrator')
mylog.txt contains:
Trying 192.168.1.254...
Connected to 192.168.1.254.
Escape character is '^]'.
Username : Administrator
Administrator
Can anyone help me in finding out what I am doing wrong?
Regards
David
To debug, add lines
print self.before
print self.after
after each child.expect(). Also, add timeout=2 to the argument list of
child.expect().
I wrote a thin wrapper that serves me well, at least till now.
class Connection(object):
'''Establishes connection to Cisco modem server.
A wrapper around fdexpect spawn.
'''
def __init__(self, host, port, user, passwd, **kwds):
self.pipe = None
self.socket = None
self.host = host
self.port = port
self.user = user
self.passwd = passwd
self.logger = kwds.get('logger')
self._last = ''
def __getattr__(self, name):
if name not in ['open', 'close', 'send', 'sendline', 'expect']:
return getattr(self.pipe, name)
def open(self):
self.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.socket.connect((self.host, self.port))
self.pipe = pexpect.fdspawn(self.socket)
self.expect('Username:', timeout=2)
self.sendline(self.user)
self.expect('Password:', timeout=1)
self.sendline(self.passwd)
self.send('ATZ\r')
self.expect('OK', timeout=1)
def send(self, s):
self._last = s
return self.pipe.send(s)
def sendcr(self, s):
self._last = s
return self.pipe.send(s+'\r')
def sendline(self, s):
self._last = s
return self.pipe.sendline(s)
def expect(self, pattern, **kwds):
rc = self.pipe.expect(pattern, **kwds)
if self.logger:
self.logger.debug('sent %s, received\n\t1. before %s\n\t' \
'2. match %s\n\t3. after %s\n', self._last,
self.before, self.match.group(0), self.after)
return rc
def close(self):
self.pipe.close()
self.pipe = None
self.socket.close()
Re: Does Python really follow its philosophy of Readability counts?
On Jan 21, 2:11 am, Mark Wooding m...@distorted.org.uk wrote: CLOS is much more complex and dynamic than Python's object system; but it can be compiled very aggressively. I agree that CLOS is complex and that it can be compiled very aggressively, but I do not think that it is more dynamic than Python. What feature are you alluding to? Multimethods? There are many Python implementations of them, they are just not in the standard library. Or are you referring to interactive facilities, such as the one discussed in this recipe http://code.activestate.com/recipes/160164 ? -- http://mail.python.org/mailman/listinfo/python-list
Re: How many followers of comp.lang.python
In article 8692c77c-0498-4c68-940f-e4d4427f3...@x37g2000yqj.googlegroups.com, rantingrick rantingr...@gmail.com wrote: Seems like the only thing people are interested in is bickering and name calling. I noticed the post Does Python really follow... has over 400 post mainly from the same 10 people. Maybe this is why Guido no longer wishes to be a part of this group. Where is the sense of community here? Anybody care to correct me, because i would love to be wrong about this, but i fear i am 100% correct. Which this? Are you asking for evidence that more than ten people regularly read comp.lang.python, OR that there is traffic in comp.lang.python other than bickering and name-calling? My own rough estimate of readership is at least 4,000. If motivated, one could refine the figure, I'm confident). -- http://mail.python.org/mailman/listinfo/python-list
Re: v = json.loads({'test':'test'})
Steven D'Aprano st...@remove-this-cybersource.com.au wrote in message news:018d0300$0$20629$c3e8...@news.astraweb.com... Supposedly every browser (what, all of them?) already support a de facto extension to the JSON standard, allowing more flexible quoting. That's a consequence of JSON being a subset of Javascript syntax, so you can just call eval() on it, if you're willing. When you use a library, it's pot luck whether it accepts JSON-soup or not. -- http://mail.python.org/mailman/listinfo/python-list
Re: How many followers of comp.lang.python
On 2009-01-27, Bruno Desthuilliers bruno.42.desthuilli...@websiteburo.invalid wrote: Please visit comp.databases or comp.lang.javascript for really unfriendly and unhelpful places where few happens except bickering and name-calling. I've always found comp.lang.c to be a rather dangerous place as well. Of the newsgroups I read, c.l.python is probably the most friendly and has one of the highest S/N ratios. People who would have been roasted alive in other newsgroups for their laziness or presumptuousness get surprisingly gentle treatment in c.l.python. I do know of a few low-volume mailing lists that are probably as good, but for a Usenet news group with any volume at all, c.l.pythong is exceptionally good. -- Grant Edwards grante Yow! I wonder if I should at put myself in ESCROW!! visi.com -- http://mail.python.org/mailman/listinfo/python-list
Exec woes
It starts with the conspiracy of silence at the interactive prompt:
Python 2.4.3 (#69, Mar 29 2006, 17:35:34) [MSC v.1310 32 bit (Intel)] on win32
Type copyright, credits or license() for more information.
IDLE 1.1.3 No Subprocess
help(exec)
SyntaxError: invalid syntax
Its the same under Linux SuSe, Python 2.5.1.
I think this is a BUG.
Anyway, my real problem looks like this:
def Somefunc():
def excrescence():
exec('BUILD = someString')
return BUILD
SyntaxError: unqualified exec is not allowed in function 'excrescence
it is a nested function (pyshell#11, line 3)
Now this works if it is not nested, and it works if it is a method in a class.
Why the complaint about the nestedness?
I would appreciate it if someone would explain, as the library reference
simply says that it would default to globals() and locals(), which also does
not seem to happen - also true for a nested eval after a compile - you have
to specify the globals() or you get a NameError - global BUILD is not defined.
So there is some namespace thing happening that is too subtle for me, and I
would like to know what unqualified means in the above message, and
what one must do to qualify the statement, if that is what is needed.
The original thing came up because I really need relative imports - I have
some version.py files in various directories that have a single line in them
that looks like the string I am feeding the exec.
By the way, execfile works in this situation, but also only if you specify
globals() explicitly. I would really like to understand what is going on.
- Hendrik
--
http://mail.python.org/mailman/listinfo/python-list
Re: socket.unbind or socket.unlisten? - socket.error: (48, 'Address already in use')
Laszlo Nagy gand...@shopzeus.com writes:
I have a program that uses socket.bind() and socket.listen()
frequently. After that program stops, it is not able to bind() again for a
while:
This is the usual TIME-WAIT problem. The TCP protocol requires one end
of the connection (whichever actually started the close) to keep a
record of it for a while after it closes, in order to avoid confusion
caused by old packets.
The problem with this, is that this server program SOMETIMES need to be
restarted very quickly.
The usual solution is to set the SO_REUSEADDR socket option before
binding. This is safe for listening sockets.
Here's an interactive session.
In [1]: import socket as S
In [2]: def make_server_socket():
...: sk = S.socket(S.AF_INET, S.SOCK_STREAM)
...: sk.bind(('', 12345))
...: sk.listen(5)
...: return sk
...:
In [3]: def serve_client(sk):
...: (nsk, addr) = sk.accept()
...: nsk.send('Hello.\n')
...: nsk.close()
...:
In [4]: sk = make_server_socket()
In [5]: serve_client(sk)
(At this point, I connect to the server in another terminal.)
In [6]: sk.close()
In [7]: sk = make_server_socket()
[...]
error: (98, 'Address already in use')
And to confirm that it's TIME-WAIT that's stopping us:
[ponder ~]netstat -n | grep 12345
tcp0 0 127.0.0.1:12345 127.0.0.1:49988 TIME_WAIT
If I change make_server_socket, then everything works fine.
In [8]: def make_server_socket():
...: sk = S.socket(S.AF_INET, S.SOCK_STREAM)
...: sk.setsockopt(S.SOL_SOCKET, S.SO_REUSEADDR, 1)
...: sk.bind(('', 12345))
...: sk.listen(5)
...: return sk
...:
In [10]: sk = make_server_socket()
In [11]: serve_client(sk)
In [13]: sk.close()
In [14]: sk = make_server_socket()
Done.
If you try this, note that both the old, closed socket /and/ the new one
must have SO_REUSEADDR set on them. If you try this interactively,
you'll have to wait for the non-SO_REUSEADDR socket to leave TIME-WAIT
before you can bind. But once you've done that, it'll work fine from
then on.
-- [mdw]
--
http://mail.python.org/mailman/listinfo/python-list
IDLE 3000 (suggested improvements)
Proposal:
OK, so the python language has officially moved into the next level. I
look at IDLE and think, hmm great IDE but it could really use a spit
shining. So here is a very simple script showing my ideas to improve
IDLE.
Reason for change:
The text widget and the prompt() should be separated. Trying to
write a conditional in the interactive IDLE is a real pain. Not to
mention that when you copy code from Interactive IDLE to the IDLE
editor window the indention is eight spaces instead four and you've
got that prompt() stuck in there. I have a solution for the problem
though.
I hope you are using fixed-width font
Lst|- Text Widget |
||
|if this:|
...|if that:|
...|... |
...|elif that: |
...|... |
...|else: |
...|... |
||
|x = 10 |
||
Basically you have a Listbox on the left for the prompt and a Text on
the right. Disable the Listbox highlight and key press events and now
we have a very friendly interactive IDLE! No more prompt hijacking
your snippets, and no more eigtht space indention! Hip-Hip-Hooray!
#-- Start Script --#
from Tkinter import *
import tkMessageBox as MB
class CMD(Toplevel):
def __init__(self, master):
Toplevel.__init__(self, master)
self.master = master
self.startidx = '1.0'
self.backidx = '1.0'
self.title('IDLE 3000')
self.listbox = Listbox(self, width=3, relief=FLAT, font=
('Courier New',12), takefocus=0)
self.listbox.pack(fill=Y, side=LEFT)
self.listbox.insert(0, '')
self.text = Text(self, relief=FLAT, spacing3=1, wrap=NONE,
font=('Courier New',12))
self.text.pack(fill=BOTH, side=LEFT, expand=1)
self.text.config(width=50, height=20)
self.text.focus_set()
self.listbox.bind(KeyPress , lambda e: break)
self.listbox.bind(Button-1 , lambda e: break)
self.listbox.bind(B1-Motion , lambda e: break)
self.listbox.bind(ButtonRelease-1 , lambda e: break)
self.listbox.bind(B2-Motion , lambda e: break)
self.listbox.bind(MouseWheel, lambda e: break)
self.text.bind('Next' , lambda e: break)#pageup
self.text.bind('Prior', lambda e: break)#pagedown
self.text.bind('Delete' , lambda e: break)
self.text.bind('Control-Home' , lambda e: break)
self.text.bind('Control-End' , lambda e: break)
self.text.bind(B2-Motion, lambda e: break)
self.text.bind('Button-2' , lambda e: break)
self.text.bind(MouseWheel , lambda e: break)
self.text.bind(Up , self.onUp)
self.text.bind(Down , self.onDown)
self.text.bind(Tab , self.onTab)
self.text.bind(Return , self.onReturn)
self.text.bind(BackSpace, self.onBackSpace)
self.protocol(WM_DELETE_WINDOW, self.onQuit)
self.lift(master)
self.master.withdraw()
def fix_index(self, chars):
self.backidx = '%d.0' %(int(self.backidx.split('.')[0])+1)
self.text.insert(END, '\n')
self.text.mark_set(INSERT, END)
self.text.see(INSERT)
self.listbox.insert(END, chars)
self.listbox.see(self.listbox.size())
def onQuit(self):
self.grab_release()
self.master.destroy()
def onTab(self, event=None):
curline, cursor = self.text.index(INSERT).split('.')[0]+'.0',
self.text.index(INSERT)
self.text.insert(INSERT, '')
return break
def onDown(self, event):
i = self.text.index(INSERT+'+1l') #;print 'New index: ', i
self.text.mark_set(INSERT, i)
self.text.see(i)
self.listbox.see(int(i.split('.')[0])-1)
return break
def onUp(self, event=None):
i = self.text.index(INSERT+'-1l') #;print 'New index: ', i
self.text.mark_set(INSERT, i)
self.text.see(i)
self.listbox.see(int(i.split('.')[0])-1)
return break
def onBackSpace(self, event=None):
if self.text.compare(self.text.index(INSERT), '!=',
self.backidx):
self.text.delete(self.text.index(INSERT+'-1c'))
return break
def onReturn(self, event=None):
curline, cursor = self.text.index(INSERT).split('.')[0]+'.0',
self.text.index(INSERT)
text = self.text.get(self.startidx, END).strip()
if self.text.compare(curline, '', self.startidx):#'Out Of
Zone'
self.text.mark_set(INSERT, END+'-1c')
self.text.see(INSERT)
self.listbox.see(END)
elif '.0' in cursor: #nothing typed on this line, try to exec
command
cmd = text.rstrip('\n')
try:
exec(cmd)
except:
self.master.bell()
print '%s\n%s\n%s'
regular expression, help
I think there are two parts to this question and I am sure lots I am
missing. I am hoping an example will help meI have a html doc that I am
trying to use regular expressions to get a value out of.
here is an example or the line
td colspan='2'Parcel ID: 39-034-15-009 /td
I want to get the number 39-034-15-009 after Parcel ID: The number will
be different each time but always the same format.
I think I can match Parcel ID: but not sure how to get the number after.
Parcel ID: only occurs once in the document.
is this how i need to start?
pid = re.compile('Parcel ID: ')
Basically I am completely lost and am not finding examples I find helpful.
I am getting the html using myurl=urllib.urlopen().
Can I use RE like this
thenum=pid.match(myurl)
I think the two key things I need to know are
1, how do I get the text after a match?
2, when I use myurl=urllib.urlopen(http://...). can I use the myurl as
the string in a RE, thenum=pid.match(myurl)
Thanks
Vincent
--
http://mail.python.org/mailman/listinfo/python-list
regular expression, help
I think there are two parts to this question and I am sure lots I am
missing. I am hoping an example will help meI have a html doc that I am
trying to use regular expressions to get a value out of.
here is an example or the line
td colspan='2'Parcel ID: 39-034-15-009 /td
I want to get the number 39-034-15-009 after Parcel ID: The number will
be different each time but always the same format.
I think I can match Parcel ID: but not sure how to get the number after.
Parcel ID: only occurs once in the document.
is this how i need to start?
pid = re.compile('Parcel ID: ')
Basically I am completely lost and am not finding examples I find helpful.
I am getting the html using myurl=urllib.urlopen().
Can I use RE like this
thenum=pid.match(myurl)
I think the two key things I need to know are
1, how do I get the text after a match?
2, when I use myurl=urllib.urlopen(http://...). can I use the myurl as
the string in a RE, thenum=pid.match(myurl)
Thanks
Vincent
--
http://mail.python.org/mailman/listinfo/python-list
Re: Calling Python-tk code from C/C++
En Tue, 27 Jan 2009 07:42:01 -0200, Rajorshi Biswas rajor...@in.com escribió: Hello all, This is my first post to this mailing list. Our requirement is to invoke a Tkinter python panel from a C++ GUI app where both GUI windows would run in 2 separate threads. We have written a sample PyQt application which calls this Tk panel using something like this:class TkPanel(threading.Thread):def run(self): # call showPaneldef showPanel():# create window = Tk.Tk() window.mainloop()def start():t = TkPanel()t.start()Now we call this from our main python code:def startPanel(self): import tkPanel tkPanel.start() # this calls tkwindow.mainloop() in a separate thread.This works absolutely fine when the invoking app is Python. From the above description I don't see where PyQt is involved. Do you really want to mix Qt and Tk in the same application? I don't think they could coexist... -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: Exec woes
Hendrik van Rooyen schrieb: It starts with the conspiracy of silence at the interactive prompt: Python 2.4.3 (#69, Mar 29 2006, 17:35:34) [MSC v.1310 32 bit (Intel)] on win32 Type copyright, credits or license() for more information. IDLE 1.1.3 No Subprocess help(exec) SyntaxError: invalid syntax Its the same under Linux SuSe, Python 2.5.1. I think this is a BUG. No, it's the way exec is defined. exec is not a function, it's a statement. help(exec) raises a syntax error like help(if) or help(while) would raise a syntax error, too. Christian -- http://mail.python.org/mailman/listinfo/python-list
Re: optparse question
* John Machin (Tue, 27 Jan 2009 05:31:42 -0800 (PST)) Nobody is upset, and nobody has gone off on a tear. The point about the Windows example is that the docs say in a close-to-screamingly- obvious manner that /options are not supported, no matter what religion uses them. It was not, and still is not, apparent what you really wanted. We're all patiently waiting for you to rephrase the question(s). Amen, brother. Thorsten -- http://mail.python.org/mailman/listinfo/python-list
Re: optparse with numpy.array?
Johan Ekh wrote: Thanks, James I will try your suggestion! Robert, what mean with interactively is that i would like to create an array in the ipython shell, e.g. with m_i = array([1.0, 2.0, 3.0]) or by reading a file with values etc., and then execute my program with myprog -m m_i and thus pass the array m_i to my program. This is just an example. I would like to pass several arrays. My program will be wrapped inside a loop and the arrays are updated in each loop. The bottom line is that there is no natural way to pass Python objects through the command line, so you will need to find a natural way to represent the objects as character strings, and then extend the optparse module to recognize that type. regards Steve -- Steve Holden+1 571 484 6266 +1 800 494 3119 Holden Web LLC http://www.holdenweb.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: How many followers of comp.lang.python
Being a newbie and not aware of other good places to ask dump questions. I have been very happy with the help I have gotten. Some of the other discussions are a little interesting to me but I wonder/am grateful if these keep the knowledgeable people around so us newbies can ask questions. Since I am a beginner programer and new to python it is really help to have a place to ask quick or long questions. Books are nly so good, Google helps but it doesn't debug code for you. Thanks Vincent Davis On Tue, Jan 27, 2009 at 10:13 AM, Grant Edwards inva...@invalid wrote: On 2009-01-27, Bruno Desthuilliers bruno.42.desthuilli...@websiteburo.invalid wrote: Please visit comp.databases or comp.lang.javascript for really unfriendly and unhelpful places where few happens except bickering and name-calling. I've always found comp.lang.c to be a rather dangerous place as well. Of the newsgroups I read, c.l.python is probably the most friendly and has one of the highest S/N ratios. People who would have been roasted alive in other newsgroups for their laziness or presumptuousness get surprisingly gentle treatment in c.l.python. I do know of a few low-volume mailing lists that are probably as good, but for a Usenet news group with any volume at all, c.l.pythong is exceptionally good. -- Grant Edwards grante Yow! I wonder if I should at put myself in ESCROW!! visi.com -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: regular expression, help
is BeautifulSoup really better? Since I don't know either I would prefer to
learn only one for now.
Thanks
Vincent Davis
On Tue, Jan 27, 2009 at 10:39 AM, MRAB goo...@mrabarnett.plus.com wrote:
Vincent Davis wrote:
I think there are two parts to this question and I am sure lots I am
missing. I am hoping an example will help me
I have a html doc that I am trying to use regular expressions to get a
value out of.
here is an example or the line
td colspan='2'Parcel ID: 39-034-15-009 /td
I want to get the number 39-034-15-009 after Parcel ID: The number
will be different each time but always the same format.
I think I can match Parcel ID: but not sure how to get the number after.
Parcel ID: only occurs once in the document.
is this how i need to start?
pid = re.compile('Parcel ID: ')
Basically I am completely lost and am not finding examples I find helpful.
I am getting the html using myurl=urllib.urlopen(). Can I use RE like this
thenum=pid.match(myurl)
I think the two key things I need to know are
1, how do I get the text after a match?
2, when I use myurl=urllib.urlopen(http://...). can I use the myurl
as the string in a RE, thenum=pid.match(myurl)
Something like:
pid = re.compile(r'Parcel ID: (\d+(?:-\d+)*)')
myurl = urllib.urlopen(url)
text = myurl.read()
myurl.close()
thenum = pid.search(text).group(1)
Although BeautifulSoup is the preferred solution.
--
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--
http://mail.python.org/mailman/listinfo/python-list
change syntax coloring in IDLE
I am using mac with python 2.5.2 and IDLE verison 1.2.2. in the help it states I can change he text coloring by using Configure IDLE but I not sure what this is. It's not sn the menu, running Configure does nothing. How do I change the color (text and background) Thanks Vincent Davis -- http://mail.python.org/mailman/listinfo/python-list
Re: Exec woes
On Tue, Jan 27, 2009 at 9:34 AM, Christian Heimes li...@cheimes.de wrote: Hendrik van Rooyen schrieb: It starts with the conspiracy of silence at the interactive prompt: Python 2.4.3 (#69, Mar 29 2006, 17:35:34) [MSC v.1310 32 bit (Intel)] on win32 Type copyright, credits or license() for more information. IDLE 1.1.3 No Subprocess help(exec) SyntaxError: invalid syntax Its the same under Linux SuSe, Python 2.5.1. I think this is a BUG. No, it's the way exec is defined. exec is not a function, it's a statement. help(exec) raises a syntax error like help(if) or help(while) would raise a syntax error, too. Indeed. Although it would happen to work in Python 3.0, as exec() became a function once again. Cheers, Chris -- Follow the path of the Iguana... http://rebertia.com -- http://mail.python.org/mailman/listinfo/python-list
Re: regular expression, help
Vincent Davis wrote:
I think there are two parts to this question and I am sure lots I am
missing. I am hoping an example will help me
I have a html doc that I am trying to use regular expressions to get a
value out of.
here is an example or the line
td colspan='2'Parcel ID: 39-034-15-009 /td
I want to get the number 39-034-15-009 after Parcel ID: The number
will be different each time but always the same format.
I think I can match Parcel ID: but not sure how to get the number
after. Parcel ID: only occurs once in the document.
is this how i need to start?
pid = re.compile('Parcel ID: ')
Basically I am completely lost and am not finding examples I find helpful.
I am getting the html using myurl=urllib.urlopen().
Can I use RE like this
thenum=pid.match(myurl)
I think the two key things I need to know are
1, how do I get the text after a match?
2, when I use myurl=urllib.urlopen(http://...). can I use the myurl
as the string in a RE, thenum=pid.match(myurl)
Something like:
pid = re.compile(r'Parcel ID: (\d+(?:-\d+)*)')
myurl = urllib.urlopen(url)
text = myurl.read()
myurl.close()
thenum = pid.search(text).group(1)
Although BeautifulSoup is the preferred solution.
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Re: How do I say two classes up in the inheritance chain in python?
I have two classes that both inherit from two other classes which both inherit from a single class. The two children have two almost identical methods: class grandparent( object ): def meth( self ): # do something class parent1( grandparent ): def meth( self ): # do something p1 super( parent1, self ).meth( ) class parent2( grandparent ): def meth( self ): # do something p2 super( parent2, self ).meth( ) class child1( parent1 ): def meth( self ): # do something c super( parent1, self ).meth( ) # I want to invoke meth on grandparent If so, it might be better to explicitly call grandparent.meth (passing self as first argument). But this is an obvious design smell IMHO. What you have is : def meth(self): do_something_more_or_less_specific call_granparent Looks like a candidate for a template method. Since you don't have hand on Grandparent, the simplest would be to add an additional base class, ie: class Abstract(Grandparent): def do_something(self): raise NotImplementedError def meth(self): self.do_something() super(Abstract, self).meth() class Parent1(Abstract): def do_something(self): # do something p1 class Parent2(Abstract): def do_something(self): # do something p2 Now you're problem is to factor out do_something() for Child1 and Child2. The solution is quite simple : just define it outside the class statements, and adds it afterward: def do_something_children(self): # code here class Child1(Parent1): # code here Child1.do_something = do_something_children class Child2(Parent2): # code here Child2.do_something = do_something_children Thanks, this was very helpful. Also, thanks Duncan, your simple suggestion was helpful too to just call the grandparent directly (without super). Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: Exec woes
IDLE 1.1.3 No Subprocess
help(exec)
SyntaxError: invalid syntax
Its the same under Linux SuSe, Python 2.5.1.
I think this is a BUG.
Exec is a statement, not a function nor an object: even though you can
enclose parens around its arguments like you do later on, they don't have
any syntax meaning.
You can't help(print) or help(import) either.
Anyway, my real problem looks like this:
def Somefunc():
def excrescence():
exec('BUILD = someString')
return BUILD
SyntaxError: unqualified exec is not allowed in function 'excrescence
it is a nested function (pyshell#11, line 3)
Now this works if it is not nested, and it works if it is a method in a
class.
Why the complaint about the nestedness?
Once upon a time, Python had only two scopes or namespaces: local and
globals. It'd look up variables in the local scope and if it didn't find
them, it'd look them up in the global scope. (There's also the builtin
namespace but to not digress...)
Under this scenario, if you define some attributes in Somefunc() those will
NOT be visible within excrescence(). So:
def foo():
a = 5
def bar():
print a # error
wouldn't work.
Then PEP227 came around to add nested scopes -- or lexical scopes. Its what
made nested functions like that actually useful: it's what brought
closures into the scenario. As of Python 2.2, within bar() it would be able
to see the definition of a because namespaces can now be nested.
This addition was a problem for a couple features: doing from blah import
* within a function, and a bare exec (an exec without an explicit globals()
and locals()) that happened in certain places-- in this case a nested
function. They introduced that SyntaxError to make sure it wouldn't
accidentally hit you. Read up on PEP227 for the full details.
To get around this, you need to specify exactly what scope you want exec to
happen in when you're in a place where the 'current' scope is nested. You
qualify exec--
So there is some namespace thing happening that is too subtle for me, and I
would like to know what unqualified means in the above message, and
what one must do to qualify the statement, if that is what is needed.
by doing:
exec code in global dictionary, local dictionary
In your situation:
def Somefunc():
def excrescence():
exec BUILD = 'someString' in globals(), locals()
is probably sufficient. globals() returns the dictionary of the global
namespace, locals() the dictionary of the current functions (non-nested)
namespace.
HTH,
--Stephen
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Re: How many followers of comp.lang.python
On Jan 27, 10:12 am, Bruno Desthuilliers bruno. 42.desthuilli...@websiteburo.invalid wrote: All you can say is that he didn't *post* here (at least under his real identity...) for the 9 past years - this doesn't mean he never *reads* (and this, you just have no way to know). Ah, this is a good point. You have to wonder, Guido could be one of the regulars here. very interesting. We should have a vote as to who would be the most likely candidate, now that would be a good thread :) -- http://mail.python.org/mailman/listinfo/python-list
Re: How many followers of comp.lang.python
Bruno Desthuilliers bruno.42.desthuilli...@websiteburo.invalid writes: All you can say is that he didn't *post* here (at least under his real identity...) for the 9 past years - this doesn't mean he never *reads* (and this, you just have no way to know). Guido does post here once in a while, under his own name. I can't think of any very recent examples, but I can remember some from a few years back. -- http://mail.python.org/mailman/listinfo/python-list
Re: unable to print Unicode characters in Python 3
* Giampaolo Rodola' (Tue, 27 Jan 2009 04:52:16 -0800 (PST))
I have this same issue on Windows.
Note that on Python 2.6 it works:
Python 2.6.1 (r261:67517, Dec 4 2008, 16:51:00) [MSC v.1500 32 bit
(Intel)] on
win32
Type help, copyright, credits or license for more information.
print unicode('\u20ac')
\u20ac
This is pretty serious, IMHO, since breaks any Windows software
priting unicode to stdout.
I've filed an issue on the Python bug tracker:
http://bugs.python.org/issue5081
For printing to stdout you have to give an encoding that the terminal
understands and that contains the character. In your case the terminal
says I speak cp 850 but of course there is no Euro sign in there. Why
should that be a bug?
Thorsten
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Re: A different kind of interface
PyScripter does it for me. http://code.google.com/p/pyscripter/ jab -- http://mail.python.org/mailman/listinfo/python-list
Re: How many followers of comp.lang.python
On Jan 27, 12:00 pm, Paul Rubin http://phr...@nospam.invalid wrote: Guido does post here once in a while, under his own name. I can't think of any very recent examples, but I can remember some from a few years back. I searched the archives for Guido van Rossum and there is nothing since May 2000. That's the most recent i could find anyway?? -- http://mail.python.org/mailman/listinfo/python-list
Re: unable to print Unicode characters in Python 3
* Denis Kasak (Tue, 27 Jan 2009 14:22:32 +0100)
On Tue, Jan 27, 2009 at 1:52 PM, Giampaolo Rodola' gne...@gmail.com
wrote:
I have this same issue on Windows.
Note that on Python 2.6 it works:
Python 2.6.1 (r261:67517, Dec 4 2008, 16:51:00) [MSC v.1500 32 bit
(Intel)] on
win32
Type help, copyright, credits or license for more information.
print unicode('\u20ac')
\u20ac
Shouldn't this be
print unicode(u'\u20ac')
You are trying to create a Unicode object from a Unicode object. Doesn't
make any sense.
on 2.6? Without the 'u' prefix, 2.6 will just encode it as a normal
(byte) string and escape the backslash.
You are confusing encoding and decoding. unicode(str) = str.decode. To
print it you have to encode it again to a character set that the
terminal understands and that contains the desired character.
Thorsten
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Re: Why GIL? (was Re: what's the point of rpython?)
Bryan Olson wrote: Paul Rubin wrote: Bryan Olson fakeaddr...@nowhere.org writes: An object's __dict__ slot is *not* mutable; thus we could gain some efficiency by protecting the object and its dict with the same lock. I do not see a major win in Mr. Banks' point that we do not need to lock the object, just its dict. If the dict contents don't change often, maybe we could use an STM-like approach to eliminate locks when reading. That would of course require rework to just about every C function that accesses Python objects. I'm a fan of lock-free data structure and software transactional memory, but I'm also a realist. Heck, I'm one of this group's outspoken advocates of threaded architectures. Theoretical breakthroughs will happen, but in real world of today, threads are great but GIL-less Python is a loser. Wherever Python is going, let's recognize that a scripting language that rocks is better than any other kind of language that sucks. Guido, IIRC, has said that he's against any GIL-removal policy that lowers performance on single-processor systems. Personally I'd be happy if there were an *alternative* multi-processor implementation that was slower for single-processor architectures and faster for multi-processor, but I'm not about to start developing it. regards Steve -- Steve Holden+1 571 484 6266 +1 800 494 3119 Holden Web LLC http://www.holdenweb.com/ -- http://mail.python.org/mailman/listinfo/python-list
pyAA for Python2.5
Hi, I would like to obtain pyAA for Python 2.5. I went through their web site, but they provide the windows exe only for Python2.4. I tried compiling from source, but that also was to no avail - it errs out as follows: C:\Documents and Settings\Guest\pyAApython setup.py install running install running build running build_py file pyAAc.py (for module pyAAc) not found file pyAAc.py (for module pyAAc) not found running build_ext error: Python was built with Visual Studio 2003; extensions must be built with a compiler than can generate compatible binaries. Visual Studio 2003 was not found on this system. If you have Cygwin installed, you can try compiling with MingW32, by passing -c mingw32 to setup.py. C:\Documents and Settings\Guest\pyAApython setup.py install -c mingw32 usage: setup.py [global_opts] cmd1 [cmd1_opts] [cmd2 [cmd2_opts] ...] or: setup.py --help [cmd1 cmd2 ...] or: setup.py --help-commands or: setup.py cmd --help error: invalid command 'mingw32' Has anyone tried the same? Can anyone give any suggestions? -- http://mail.python.org/mailman/listinfo/python-list
