May Introduction to Python class
Holden Web is pleased to announce the next run of its popular three-day Introduction to Python class in Washington DC on May 11-13, 2010. Further details of all current event listings are available from http://holdenweb.eventbrite.com/ regards Steve -- Steve Holden +1 571 484 6266 +1 800 494 3119 See PyCon Talks from Atlanta 2010 http://pycon.blip.tv/ Holden Web LLC http://www.holdenweb.com/ UPCOMING EVENTS:http://holdenweb.eventbrite.com/ -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
PyCon Australia CFP: One Day Left!
The Call For Proposals for PyCon Australia 2010 FINISHES TOMORROW! Presentation subjects may range from reports on open source, academic and commercial projects to tutorials and case studies. As long as a presentation is interesting and potentially useful to the Python community, it will be considered for inclusion in the program. We're especially interested in short presentations that will teach conference-goers something new and useful. Can you show attendees how to use a module? Explore a Python language feature? Package an application? Submit your proposal here: http://pycon-au.org/cfp As always, please pass this message on to people you feel will find it interesting. Richard Jones PyCon Australia 2010 http://pycon-au.org/ -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
SWIG + expy
Hi, Is it possible to use SWIG to parse C/C++, and provide an interface for me to generate some code? I thought it might be good to have SWIG help generate expy (see http://expy.sourceforge.net) files, then generate the python extension via expy. Yingjie -- http://mail.python.org/mailman/listinfo/python-list
Re: WIN32 - get the GUID of a Network Device
On 26/04/2010 22:07, Tim Roberts wrote:
Tim Golden wrote:
On 26/04/2010 09:49, Richard Lamboj wrote:
thanks for your response. No, i don't mean the MAC Address. I mean
the GUID -
Sample: {1E2428C1-9F2C-48D7-AB53-3229DFB7E217}
I want to change TcpAckFrequency and TcpDelTicks of a Network
Interface. I Try
to change it over the Registry, but maybe there is another way?
OK; I'm going to hope that Tim Roberts or someone equally
knowledgeable can
kick in here as devices really isn't my area. However this looks like
it *might*
be doing what you want:
code
import wmi
for nic in c.Win32_NetworkAdapter (MACAddress=i.MACAddress):
for pnp in c.Win32_PNPEntity (DeviceID=nic.PNPDeviceID):
print pnp.Caption, =, pnp.ClassGuid
/code
No, the PnP class GUID is the Class line from the top of the INF
file. That will be the same for all network cards.
You can look up the network interface GUID in the registry, in
HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\NetworkCards. There's
one subkey for each interface, containing a Description and a
ServiceName. The ServiceName is the interface GUID.
Thanks, Tim. I was sure you'd be in the know :)
TJG
--
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Re: Detect OS shutdown or user logout across different operating systems
On 27/04/2010 03:09, pyt...@bdurham.com wrote: Is there a OS portable way to have a Python script detect when its operating system is shutting down or a user is logging out? If not, any Windows specific tips on how to detect these events? Thank you, Malcolm Doubt v. much if there's anything x-platform. I recently wrote-up the work done my Klaas Tjebbes (sp?) which I think will do what you want: http://timgolden.me.uk/python/win32_how_do_i/track-session-events.html TJG -- http://mail.python.org/mailman/listinfo/python-list
Re: SWIG + expy
Yingjie Lan, 27.04.2010 08:30: Is it possible to use SWIG to parse C/C++, and provide an interface for me to generate some code? I thought it might be good to have SWIG help generate expy files, then generate the python extension via expy. There have been similar discussions on the Cython mailing list (you might want to search the archives). The main theme seems to be that clang provides a suitable parser, and several people have used it to write up a code generator for their specific needs (you might want to look at those). Stefan -- http://mail.python.org/mailman/listinfo/python-list
Re: chr(i) ASCII under Python 3
Le Mon, 26 Apr 2010 22:26:28 +0200, Alf P. Steinbach a écrit : On 26.04.2010 22:12, * Dodo: Hi all, Under python 2.6, chr() Return a string of one character whose ASCII code is the integer i. (quoted from docs.python.org) Under python 3.1, chr() Return the string of one character whose Unicode codepoint is the integer i. I want to convert a ASCII code back to a character under python 3, not Unicode. How can I do that? Just use chr(). Or, if you want a bytes object, just use the bytes constructor: bytes([65]) b'A' Regards Antoine. -- http://mail.python.org/mailman/listinfo/python-list
Re: Some objects missing from tkinter
Lie Ryan wrote: In fact, never trust IDLE. IDLE is a nice IDE when the alternative is Notepad; but for serious work, you need a real IDE or a programmer's text editor (vim or emacs, whichever side you're in). Some people, when confronted with a problem, think I know, I'll use emacs. Now they have two problems. More seriously, the subset of emacs I am using is probably supported by idle, too. That's why I sympathize with the OP's decision to stick with idle. Peter -- http://mail.python.org/mailman/listinfo/python-list
keyboard shortcuts glade+python
How to use keyboard shortcuts like ctrl+o for opening a file from menubar menuitm OPEN in python+GLADE? -- Varnika Tewari -- http://mail.python.org/mailman/listinfo/python-list
KeyboardInterrupt and DiskIO
DiskIO appears to not be interruptable. For example:
open('bighugefile.sql').read()
Pressing Ctrl-C (on Linux with python 2.6.4) will not interrupt the
command. I believe that it used to in previous versions of python but
I may be mistaken. Is it supposed to be that way? The behavior is
annoying and in other environments ctrl-c interrupts disk io.
--
mvh Björn
--
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Open Source Pivot table (OLAP cube?)
Hi All, I'm planning to create a new visual component for wxPython, for designing, creating and printing pivot tables. Also known as: decision cube, OLAP cube. I was searching on the internet for something similar, but I could not find any open source version (or free to use, at least). The only available free program was jmagallanes ( http://jmagallanes.sourceforge.net/en/ ) but it is a stand alone application. I would like to create something that has Python bindings (more preferably, written in Python and is extensible). Before I start on this project, can you please confirm that there is no such thing available? I do not want to work on something that is already there. Thanks, Laszlo -- http://mail.python.org/mailman/listinfo/python-list
Re: chr(i) ASCII under Python 3
Dodo wrote: Hi all, Under python 2.6, chr() Return a string of one character whose ASCII code is the integer i. (quoted from docs.python.org) Under python 3.1, chr() Return the string of one character whose Unicode codepoint is the integer i. I want to convert a ASCII code back to a character under python 3, not Unicode. How can I do that? Dorian Like a lot of things, it depends on why you're asking what you are. Characters are in Unicode on Python 3.x, by definition. That's not a problem, it's a feature. Such a character is 16 bits, and if it's an ASCII value, the bottom 7 bits exactly match ASCII, and the remaining ones are zero. However, sometimes you don't really want strings of characters, you want an array of 8 bit values, and you're used to the equivalence that earlier versions of Python give you. In those cases, sometimes a string (Unicode) works transparently, and sometimes you really want a byte array. Simplest example is when you're calling a DLL written in another language. The types bytes and bytearray are considered sequences of integers (each of range 0 to 255), rather than characters. And there are ways to convert back and forth between those and real strings. DaveA -- http://mail.python.org/mailman/listinfo/python-list
Re: Some objects missing from tkinter
On 04/27/10 18:01, Peter Otten wrote: Lie Ryan wrote: In fact, never trust IDLE. IDLE is a nice IDE when the alternative is Notepad; but for serious work, you need a real IDE or a programmer's text editor (vim or emacs, whichever side you're in). Some people, when confronted with a problem, think I know, I'll use emacs. Now they have two problems. More seriously, the subset of emacs I am using is probably supported by idle, too. That's why I sympathize with the OP's decision to stick with idle. It's not about IDLE's text editing capability, which is perfectly fine. It's about IDLE mangling your program's execution due to IDLE being written in Python itself. It's often the case your program would run fine inside IDLE but crashes badly outside; that's why if you need to use IDLE, test your program in command line as well. Otherwise you're going to be surprised. -- http://mail.python.org/mailman/listinfo/python-list
Re: Download Proprietary Microsoft Products Now
On 04/27/10 08:41, Andrej Mitrovic wrote: Although I agree, moving away from VS would be nice. Since Unladen Swallow will eventually be merged with Python, will the dev team consider trying out Clang as an alternative to VS? What would Unladen Swallow brings that would allow the development of CPython to move away from VS? Isn't Unladen Swallow's goal is only to speed up CPython. Do you mean PyPy? -- http://mail.python.org/mailman/listinfo/python-list
Python compiled modules are too big in size (even after strip)
Hi, I have just compiled python 2.6.5 from sources on ubuntu hardy 8.04. I have used a simple script to do everything in one go: ./configure --enable-shared make make install Python is compiled and installed successfully. However the modules(_socket.so, _random.so etc) are two big in terms of file size. They are around 4.5-5.0 mb each. I have used strip strip-all *.so, but still size is around 1.5 mb each. This is still too big compare to size of modules on ubuntu karmic's pre installed python 2.6.5. Am I missing something here? Do I have to re-configure or re-compile the python again from sources? Regards Prashant -- http://mail.python.org/mailman/listinfo/python-list
Re: Some objects missing from tkinter
Peter Otten __pete...@web.de writes: Some people, when confronted with a problem, think I know, I'll use emacs. Now they have two problems. Probably you know this ... but the original form of this saying had regular expressions in place of emacs. Since Jamie Zawinski coined this saying and he was a significant contributor to XEmacs it's quite ironic to see it in the form you give :) -- http://mail.python.org/mailman/listinfo/python-list
Re: Engineering numerical format PEP discussion
On 04/27/10 10:36, Keith wrote:
I think it's worth making the print statement (or print function, as
the case may be) let us do engineering notation, just like it lets us
specify scientific notation.
The print statement/function does no magic at all in specifying how
numbers look like when. The apparently magical formatting is done by the
%-operator and for {}-style formatting, the obj.__format__().
If you're using the {}-format, you can override .__format__() to define
your own formatting mini-language.
If you need to, you can monkey patch format() so that it wraps int/float
in Engineer wrapper that defines Engineer.__format__() to whatever
formatting style you're using.
--
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Re: when should I explicitly close a file?
In message mailman.2162.1272018097.23598.python-l...@python.org, Adam Tauno Williams wrote: On Fri, 2010-04-23 at 16:29 +1200, Lawrence D'Oliveiro wrote: Any implementation that doesn’t do reference-counting is brain-damaged. Why? Because a) it uses extra memory needlessly, and b) waiting until an object has dropped out of cache before touching it again just slows things down. There are much better ways to do memory management / garbage collection; especially when dealing with large applications. Especially with large applications, the above considerations apply even more so. If you don’t agree, you might as well stick to Java. -- http://mail.python.org/mailman/listinfo/python-list
Re: Engineering numerical format PEP discussion
On 04/27/10 10:47, MRAB wrote: Mark Dickinson wrote: On Apr 26, 4:36 am, Keith keith.braff...@gmail.com wrote: I am considering writing a PEP for the inclusion of an engineering format specifier, and would appreciate input from others. [...] I am thinking that if we simply added something like %n (for eNgineer) to the list of format specifiers that we could make life easier for engineers: (%n % 12345) == 12.345e+03 (%n % 1234) == 1.234e+03 (%n % 123) == 123e+00 (%n % 1.2345e-5) == 12.345e+06 I don't think there's much chance of getting changes to old-style string formatting accepted; you might be better off aiming at the new- style string formatting. (And there, the 'n' modifier is already taken for internationalization, so you'd have to find something different. :) e is already used, n is already used, g is already used, etc t for powers of a thousand, perhaps? (Or m?) or perhaps as an extension to 'e', activated by '3e' (but that's occupied for adding spaces, need to think of another way...) -- http://mail.python.org/mailman/listinfo/python-list
Re: Engineering numerical format PEP discussion
Keith wrote: I kinda like m for the whole Greco- Roman angle, now that you point it out :-) I like m, too. -- Greg -- http://mail.python.org/mailman/listinfo/python-list
Re: Open Source Pivot table (OLAP cube?)
On 27 Apr, 10:10, Laszlo Nagy gand...@shopzeus.com wrote: Hi All, I'm planning to create a new visual component for wxPython, for designing, creating and printing pivot tables. Also known as: decision cube, OLAP cube. I was searching on the internet for something similar, but I could not find any open source version (or free to use, at least). The only available free program was jmagallanes (http://jmagallanes.sourceforge.net/en/) but it is a stand alone application. I would like to create something that has Python bindings (more preferably, written in Python and is extensible). Before I start on this project, can you please confirm that there is no such thing available? I do not want to work on something that is already there. Thanks, Laszlo Please note: this is not a direct answer to your question. I would personally go for a client-server model; not worrying what the server is written in or how it works. For some reason I have a scary thought of your widget pulling in 100million records and cross-tabbing two dimensions :) Don't worry about python bindings or such, why not try and find something that can take an OLAP query, maintain aggregates/computations on a DB that can possibly return in XML/JSON/ WHATEVER then just have your widget render visually the response and send out XML/JSON/WHATEVER on click events. Basically your widget is a renderer and UI to update the MDX/whatever instructions in the OLAP server. Of course, for small datasets, just nested dicts-of-dicts rendered would probably do. hth, Jon. -- http://mail.python.org/mailman/listinfo/python-list
Re: running .py files on Linux
2010/4/27 Tingting HAN hihigh...@gmail.com I did as you say: hantingt...@tityro:~/Downloads$ ls hdfview_install_linux32.bin PythonPyTables triMC3D triMC3D_v1.0.0.tar.gz hantingt...@tityro:~/Downloads$ md5sum triMC3D_v1.0.0.tar.gz triMC3D.md5 hantingt...@tityro:~/Downloads$ ls hdfview_install_linux32.bin triMC3D triMC3D_v1.0.0.tar.gz PythonPyTables triMC3D.md5 hantingt...@tityro:~/Downloads$ md5sum -c triMC3D.md5 triMC3D_v1.0.0.tar.gz: OK hantingt...@tityro:~/Downloads$ tar zxvf triMC3D_v1.0.0.tar.gz So as it shows OK, the package is not corrupt. I extracted it and ran the .py files again, but there is still the same error as before: hantingt...@tityro:~/Downloads/triMC3D-1.0.0/python$ python gentest_empty.py Traceback (most recent call last): File gentest_empty.py, line 8, in module from tables import * File /usr/lib/python2.6/dist-packages/tables/__init__.py, line 76, in module from tables.file import File, openFile, copyFile File /usr/lib/python2.6/dist-packages/tables/file.py, line 44, in module from tables import hdf5Extension File hdf5Extension.pyx, line 11, in hdf5Extension ImportError: No module named utilsExtension I attach two .py files from the downloaded package in this email. Could you please try running them and see what is the problem? 2010/4/26 alex goretoy agore...@gmail.com make sure the tar, zip or package you downloaded isn't corrupt. verify it with a md5sum and then extract it. just a thought. Thank you, -Alex Goretoy http://launchpad.net/~a1g On Mon, Apr 26, 2010 at 11:05 AM, Tingting HAN hihigh...@gmail.comwrote: Dear Officer, I downloaded a C code packet which contains many .py files. When I try to run these.py files on my computer with Linux system, for every .py file the following error occurs: hantingt...@tityro:~/Downloads/triMC3D/python$ python Python 2.6.4 (r264:75706, Dec 7 2009, 18:43:55) [GCC 4.4.1] on linux2 Type help, copyright, credits or license for more information. [4]+ Stopped python hantingt...@tityro:~/Downloads/triMC3D/python$ python test_detector.py Traceback (most recent call last): File test_detector.py, line 9, in module from tables import * File /usr/lib/python2.6/dist-packages/tables/__init__.py, line 76, in module from tables.file import File, openFile, copyFile File /usr/lib/python2.6/dist-packages/tables/file.py, line 44, in module from tables import hdf5Extension File hdf5Extension.pyx, line 11, in hdf5Extension ImportError: No module named utilsExtension I downloaded the . I sincerely hope you could give me some advice to solve the problem. -- Best regards, HAN Tingting ETSI de Telecomunicación - office C-203-1 Dpto. Ingeniería Electrónica Ciudad Universitaria s/n Madrid 28040, Spain TEL: +34 65 232 4340 -- http://mail.python.org/mailman/listinfo/python-list -- Best regards, HAN Tingting ETSI de Telecomunicación - office C-203-1 Dpto. Ingeniería Electrónica Ciudad Universitaria s/n Madrid 28040, Spain TEL: +34 65 232 4340 Department of Photoelectric Information Engineering Zhejiang University Hangzhou 310027, P. R.China -- Best regards, HAN Tingting ETSI de Telecomunicación - office C-203-1 Dpto. Ingeniería Electrónica Ciudad Universitaria s/n Madrid 28040, Spain TEL: +34 65 232 4340 Department of Photoelectric Information Engineering Zhejiang University Hangzhou 310027, P. R.China configuration.py Description: Binary data gentest_empty.py Description: Binary data -- http://mail.python.org/mailman/listinfo/python-list
Python 2.X vs. 3.X - level of acceptance?
Hi! I've been using Python for a long while (certainly since it was 1.X), and I've taught some aspects of it in my lectures. I'm now thinking of preparing a new lecture where some of the theoretical concepts will be illustrated by implementations of e.g. automata and DPLL provers, preferably in Python. I'm so far only familiar with Python 2.X. Is Python 3 sucessful enough to make a switch worthwhile now? Or will students still face an infrastructure with mostly Python 2.X deployed in, say, 2 years time, when they graduate? Bye, Stephan -- -- It can be done! - Please email me as sch...@eprover.org (Stephan Schulz) -- http://mail.python.org/mailman/listinfo/python-list
Re: running .py files on Linux
On Tue, Apr 27, 2010 at 3:54 AM, Tingting HAN hihigh...@gmail.com wrote: snip gentest_empty.py Traceback (most recent call last): File gentest_empty.py, line 8, in module from tables import * File /usr/lib/python2.6/dist-packages/tables/__init__.py, line 76, in module from tables.file import File, openFile, copyFile File /usr/lib/python2.6/dist-packages/tables/file.py, line 44, in module from tables import hdf5Extension File hdf5Extension.pyx, line 11, in hdf5Extension ImportError: No module named utilsExtension I attach two .py files from the downloaded package in this email. Could you please try running them and see what is the problem? Seems like your version of PyTables may be outdated. Your error looks similar to that described in this (fixed) bug: http://www.pytables.org/trac/ticket/183 What version of PyTables do you have installed? Cheers, Chris -- http://blog.rebertia.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Open Source Pivot table (OLAP cube?)
Please note: this is not a direct answer to your question. I would personally go for a client-server model; not worrying what the server is written in or how it works. For some reason I have a scary thought of your widget pulling in 100million records and cross-tabbing two dimensions :) Don't worry about python bindings or such, why not try and find something that can take an OLAP query, maintain aggregates/computations on a DB that can possibly return in XML/JSON/ WHATEVER then just have your widget render visually the response and send out XML/JSON/WHATEVER on click events. Regarding the implementation, I was already thinking about separation of the data query and the rendering part. Your answer was particularly useful, because I was not thinking about MDX and a real client server model. Until now. :-) Can you tell something about the licence of the MDX language? Can I just make a new engine/library that uses MDX? Or do I need to develop a new query language in order to make it open source? It seems strange that several open source RDBMS exist (sqlite, postgresql, mysql) but none of them support multi dimensional queries. Is this a very difficult thing to implement? Even if we could only have a not-so-efficient implementation that works with smaller datasets (100 000 records or so), it would be nice to have it. Thanks Laszlo -- http://mail.python.org/mailman/listinfo/python-list
Python 2.5.x _winreg - rename a subkey
Hello, is there a way to rename a subkey? Kind Regards, Richi -- http://mail.python.org/mailman/listinfo/python-list
Re: Python 2.X vs. 3.X - level of acceptance?
Stephan Schulz, 27.04.2010 12:57: I've been using Python for a long while (certainly since it was 1.X), and I've taught some aspects of it in my lectures. I'm now thinking of preparing a new lecture where some of the theoretical concepts will be illustrated by implementations of e.g. automata and DPLL provers, preferably in Python. I'm so far only familiar with Python 2.X. Is Python 3 sucessful enough to make a switch worthwhile now? Or will students still face an infrastructure with mostly Python 2.X deployed in, say, 2 years time, when they graduate? Most likely, yes, although it will depend very much on the exact spot you look at. In two years time, I'd expect that the mass of open-source projects will have made the switch, many companies will have followed, but many others will still be using Py2. It depends on the size of their code base, the availability of truly required dependencies, the urge to keep using a well supported and future proof runtime, and various non-technical issues. Anyway, if you intend to use Python for teaching, I'd consider it worth teaching Py3 now, simply because it's a cleaner language that goes out of your way another little bit more than Py2. It's also less outdated cruft to talk about, e.g. old-style classes are gone, unicode issues are mostly gone or at least easier to explain (and worth explaining when they occur). It's just more fun to work with. :) Just my two €-cents... Stefan -- http://mail.python.org/mailman/listinfo/python-list
Re: Open Source Pivot table (OLAP cube?)
On 27 Apr, 12:16, Laszlo Nagy gand...@shopzeus.com wrote: Please note: this is not a direct answer to your question. I would personally go for a client-server model; not worrying what the server is written in or how it works. For some reason I have a scary thought of your widget pulling in 100million records and cross-tabbing two dimensions :) Don't worry about python bindings or such, why not try and find something that can take an OLAP query, maintain aggregates/computations on a DB that can possibly return in XML/JSON/ WHATEVER then just have your widget render visually the response and send out XML/JSON/WHATEVER on click events. Regarding the implementation, I was already thinking about separation of the data query and the rendering part. Your answer was particularly useful, because I was not thinking about MDX and a real client server model. Until now. :-) Can you tell something about the licence of the MDX language? Can I just make a new engine/library that uses MDX? Or do I need to develop a new query language in order to make it open source? IIRC it was MS' analysis services, but it seems so wide spread -- I'm not sure if there's an ISO standard on it or anything... I'm not a solicitor/lawyer-- GIYF. It seems strange that several open source RDBMS exist (sqlite, postgresql, mysql) but none of them support multi dimensional queries. Not strange at all! When was MD part of the SQL standard? :) One method would be to create a load of triggers that keep summary info. Depends on the DB and other stuff... Although then you're just duplicating work, and making the DB store meta-data, when something else should be doing that for it (in another DB maybe :) ) Is this a very difficult thing to implement? Even if we could only have a not-so-efficient implementation that works with smaller datasets (100 000 records or so), it would be nice to have it. Implement properly for small things (or at least acceptability), probably not. To do it properly waste your time and everyone else's -- oh yes. Let's put it this way -- would you write your own RDBMS from scratch? It also depends if you want immediate information, or if you're happy for the queried DB to be slightly out of sync with the main DB. So many options -- but I think this is getting OT for the python list. Thanks Laszlo Again, my humble opinion, Jon. -- http://mail.python.org/mailman/listinfo/python-list
Re: Python 2.X vs. 3.X - level of acceptance?
Stephan Schulz wrote: I've been using Python for a long while (certainly since it was 1.X), and I've taught some aspects of it in my lectures. I'm now thinking of preparing a new lecture where some of the theoretical concepts will be illustrated by implementations of e.g. automata and DPLL provers, preferably in Python. I'm so far only familiar with Python 2.X. Is Python 3 sucessful enough to make a switch worthwhile now? Or will students still face an infrastructure with mostly Python 2.X deployed in, say, 2 years time, when they graduate? I think you can make the decision light-heartedly, based on the current availability of libraries you'd like your students to use. The difficulty of switching between 2.x and 3.x in whatever direction is likely several magnitudes smaller than grokking the contents of your lecture. That said, I expect 2.x to dominate for the next five rather than two years. Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: running .py files on Linux
I apologize that I am new to Linux. I find this in my computer: /usr/lib/python2.6/dist-packages/tables$ How should I know which version of PyTables has been installed? What is the command? Which version should I download to solve the problem? And could you please give me the website link to download it because I am afraid I can not find the right place exactly. 2010/4/27 Chris Rebert c...@rebertia.com On Tue, Apr 27, 2010 at 3:54 AM, Tingting HAN hihigh...@gmail.com wrote: snip gentest_empty.py Traceback (most recent call last): File gentest_empty.py, line 8, in module from tables import * File /usr/lib/python2.6/dist-packages/tables/__init__.py, line 76, in module from tables.file import File, openFile, copyFile File /usr/lib/python2.6/dist-packages/tables/file.py, line 44, in module from tables import hdf5Extension File hdf5Extension.pyx, line 11, in hdf5Extension ImportError: No module named utilsExtension I attach two .py files from the downloaded package in this email. Could you please try running them and see what is the problem? Seems like your version of PyTables may be outdated. Your error looks similar to that described in this (fixed) bug: http://www.pytables.org/trac/ticket/183 What version of PyTables do you have installed? Cheers, Chris -- http://blog.rebertia.com -- Best regards, HAN Tingting ETSI de Telecomunicación - office C-203-1 Dpto. Ingeniería Electrónica Ciudad Universitaria s/n Madrid 28040, Spain TEL: +34 65 232 4340 Department of Photoelectric Information Engineering Zhejiang University Hangzhou 310027, P. R.China -- http://mail.python.org/mailman/listinfo/python-list
May Introduction to Python class
Holden Web is pleased to announce the next run of its popular three-day Introduction to Python class in Washington DC on May 11-13, 2010. Further details of all current event listings are available from http://holdenweb.eventbrite.com/ regards Steve -- Steve Holden +1 571 484 6266 +1 800 494 3119 See PyCon Talks from Atlanta 2010 http://pycon.blip.tv/ Holden Web LLC http://www.holdenweb.com/ UPCOMING EVENTS:http://holdenweb.eventbrite.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Python compiled modules are too big in size (even after strip)
On 27 Apr, 10:43, King animator...@gmail.com wrote: Hi, I have just compiled python 2.6.5 from sources on ubuntu hardy 8.04. I have used a simple script to do everything in one go: ./configure --enable-shared make make install Python is compiled and installed successfully. However the modules(_socket.so, _random.so etc) are two big in terms of file size. They are around 4.5-5.0 mb each. I have used strip strip-all *.so, but still size is around 1.5 mb each. This is still too big compare to size of modules on ubuntu karmic's pre installed python 2.6.5. Am I missing something here? Do I have to re-configure or re-compile the python again from sources? Regards Prashant Err, the common install on karmic is 2.6.4... IIRC (and probably not) the default was 2.6.2 on hardy Obviously doesn't help where you're finding large sized shared libs, but anyway... Jon. -- http://mail.python.org/mailman/listinfo/python-list
Re: running .py files on Linux
2010/4/27 Chris Rebert c...@rebertia.com On Tue, Apr 27, 2010 at 3:54 AM, Tingting HAN hihigh...@gmail.com wrote: snip gentest_empty.py Traceback (most recent call last): File gentest_empty.py, line 8, in module from tables import * File /usr/lib/python2.6/dist-packages/tables/__init__.py, line 76, in module from tables.file import File, openFile, copyFile File /usr/lib/python2.6/dist-packages/tables/file.py, line 44, in module from tables import hdf5Extension File hdf5Extension.pyx, line 11, in hdf5Extension ImportError: No module named utilsExtension I attach two .py files from the downloaded package in this email. Could you please try running them and see what is the problem? Seems like your version of PyTables may be outdated. Your error looks similar to that described in this (fixed) bug: http://www.pytables.org/trac/ticket/183 What version of PyTables do you have installed? On Tue, Apr 27, 2010 at 5:06 AM, Tingting HAN hihigh...@gmail.com wrote: I apologize that I am new to Linux. I find this in my computer: /usr/lib/python2.6/dist-packages/tables$ How should I know which version of PyTables has been installed? What is the command? Well, there are more generic ways depending on how you installed it, but for this particular package: python -c 'from tables.table import obversion; print obversion' Which version should I download to solve the problem? Dunno exactly, but based on the dates, it was fixed before 2.1.2 And could you please give me the website link to download it because I am afraid I can not find the right place exactly. Might as well just go for the latest version: http://www.pytables.org/download/preliminary/pytables-2.2b3/tables-2.2b3.tar.gz Cheers, Chris -- http://blog.rebertia.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Python 2.5.x _winreg - rename a subkey
On 27/04/2010 12:23, Richard Lamboj wrote: is there a way to rename a subkey? This is essentially a Windows question, since the _winreg module is a lightweight wrapper around (some of) the MS Reg functions: http://msdn.microsoft.com/en-us/library/ms724875%28v=VS.85%29.aspx And: no, there isn't a rename key function. Which isn't to say you can't reproduce the effect by using SaveKey and LoadKey followed by deleting the original key. The transactional functions which are available from Vista onwards aren't exposed by Python altho' some are available via the win32api module of the pywin32 packages: http://timgolden.me.uk/pywin32-docs/win32api.html TJG -- http://mail.python.org/mailman/listinfo/python-list
Re: dictionary
On Apr 26, 2010, at 8:04 PM, gopi krishna wrote: When I give a dictionary with key and value in order how can get back iy in same order I use YAML a lot, which supports ordered dicts, and these are interpreted as lists of pairs by Python, so that might be a good choice. -- http://mail.python.org/mailman/listinfo/python-list
Re: Engineering numerical format PEP discussion
On Apr 27, 2:16 am, Keith keith.braff...@gmail.com wrote: On Apr 26, 8:47 pm, MRAB pyt...@mrabarnett.plus.com wrote: t for powers of a thousand, perhaps? (Or m?) Both of those letters are fine. I kinda like m for the whole Greco- Roman angle, now that you point it out :-) By the way, there's already a feature request open for this: http://bugs.python.org/issue8060 That might be a good place to hash out the precise semantics. If you could provide unit tests and/or an implementation that would likely help move the issue along. Mark -- http://mail.python.org/mailman/listinfo/python-list
Problems with extra blank line when using csv.writer in Python 3.1
I’m experiencing a problem with the csv module in Python 3.1.2, and
would greatly appreciate any help anyone can offer me. When writing
csv files in Python 2.6, I open the output file as 'wb' to prevent a
blank line being inserted after every line. Works like a charm. But I
get an error if I do the same in 3.1; i.e if type the following
sequence of commands:
import csv
outfile = open('c:/temp/test.csv', 'wb')
writer = csv.writer(outfile)
line = [1, 2, 3, 4]
writer.writerow(line)
Traceback (most recent call last):
File pyshell#26, line 1, in module
writer.writerow(line)
TypeError: must be bytes or buffer, not str
Switching to
outfile = open('c:/temp/test.csv', 'w')
makes it work, but I now have a blank line after each line when I open
the file using Excel. Any thoughts or guidance on what I ought to be
doing in 3.1 to fix the extra blank line problem?
Thank you in advance
Thomas Philips
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Pointers in Python
Hi, I can't figure out how can I change the variable type in function.
In C I could do that easily by changing pointer.
Code:
def add(b):
b = {}
print type(b)
a = []
print type(a)
add(a)
print type(a)
Output:
type 'list'
type 'dict'
type 'list'
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Re: Pointers in Python
On Tue, Apr 27, 2010 at 6:09 AM, Anton Shishkov
anton.shish...@gmail.com wrote:
Hi, I can't figure out how can I change the variable type in function.
In C I could do that easily by changing pointer.
Code:
def add(b):
b = {}
print type(b)
a = []
print type(a)
add(a)
print type(a)
Output:
type 'list'
type 'dict'
type 'list'
Python uses call-by-object
(http://effbot.org/zone/call-by-object.htm), so what you're trying to
do isn't possible.
One would normally just return the new object as a result instead.
If you have a more concrete example, someone might be able to suggest
a better approach.
Cheers,
Chris
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Re: Pointers in Python
Hi, I can't figure out how can I change the variable type in function.
In C I could do that easily by changing pointer.
Please read about mutable and immutable objects in Python. If you
understand the difference between them, you will get the idea. I'll
explain program anyway, showing you need to think differently.
Code:
def add(b):
b = {}
Here you create a new dict objects, and rebind the local name 'b' to
this newly created object.
print type(b)
a = []
Here you create a new list object, and bind the global name 'a' to this
object.
print type(a)
add(a)
You call your function here, passing the list object you have previously
created. The list object won't be changed (and in fact, won't be used at
all).
print type(a)
Now, if try to rewrite your example like this:
def add(b):
b.append(10) # Call append() on b - change its state!
a = []
print a
add(a)
print a # Prints [10]
Look how the list object was changed.
If you use an immutable object, it is totally different:
def add(b):
b = b + 2
a = 10
print a
add(a)
print a # Prints 10
It is because inside the add() function, you do not CHANGE the state of the
integer object. Instead of that, you create a new integer object, and rebind
that to a local variable name. State of certain objects cannot be changed at
all. They are called immutable. Integers, floats, strings are immutable. Other
objects are mutable: lists, dicts etc.
This is a big difference between C and Python. In C, variable names are just pointers to memory locations. In Python, they are references to objects.
I'm sure others will also answer your question...
Best,
Laszlo
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Re: Problems with extra blank line when using csv.writer in Python 3.1
tkp...@hotmail.com wrote:
I’m experiencing a problem with the csv module in Python 3.1.2, and
would greatly appreciate any help anyone can offer me. When writing
csv files in Python 2.6, I open the output file as 'wb' to prevent a
blank line being inserted after every line. Works like a charm. But I
get an error if I do the same in 3.1; i.e if type the following
sequence of commands:
import csv
outfile = open('c:/temp/test.csv', 'wb')
writer = csv.writer(outfile)
line = [1, 2, 3, 4]
writer.writerow(line)
Traceback (most recent call last):
File pyshell#26, line 1, in module
writer.writerow(line)
TypeError: must be bytes or buffer, not str
Switching to
outfile = open('c:/temp/test.csv', 'w')
makes it work, but I now have a blank line after each line when I open
the file using Excel. Any thoughts or guidance on what I ought to be
doing in 3.1 to fix the extra blank line problem?
Untested, because I don't have Windows available, but try
outfile = open(filename, w, newline=)
Peter
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Re: Pointers in Python
Anton Shishkov a écrit : Hi, I can't figure out how can I change the variable type in function. In C I could do that easily by changing pointer. (snip) Others already answered on this. Now, the real question is : why to you want to do such a thing ? Of one the most common use case for this idiom in C is to workaround the lack of multiple return values, so your function returns an error code *and* sets a value thru the pointer. This idiom makes no sense in Python since we have exception handling. FWIW, other use case are usually solved by tuple unpacking, ie: def fun(a, b): return a+b, a*b sum_, prod = fun(5, 4.5) HTH -- http://mail.python.org/mailman/listinfo/python-list
Re: running .py files on Linux
Well, another person in our lab solved it by using the command: python2.5 configuration.py I do not know exactly why python2.6 in my computer does not work. The code packet I dowloaded was was made in 2007, so maybe old versions of python should work. 2010/4/27 Chris Rebert creb...@ucsd.edu 2010/4/27 Chris Rebert c...@rebertia.com On Tue, Apr 27, 2010 at 3:54 AM, Tingting HAN hihigh...@gmail.com wrote: snip gentest_empty.py Traceback (most recent call last): File gentest_empty.py, line 8, in module from tables import * File /usr/lib/python2.6/dist-packages/tables/__init__.py, line 76, in module from tables.file import File, openFile, copyFile File /usr/lib/python2.6/dist-packages/tables/file.py, line 44, in module from tables import hdf5Extension File hdf5Extension.pyx, line 11, in hdf5Extension ImportError: No module named utilsExtension I attach two .py files from the downloaded package in this email. Could you please try running them and see what is the problem? Seems like your version of PyTables may be outdated. Your error looks similar to that described in this (fixed) bug: http://www.pytables.org/trac/ticket/183 What version of PyTables do you have installed? On Tue, Apr 27, 2010 at 5:06 AM, Tingting HAN hihigh...@gmail.com wrote: I apologize that I am new to Linux. I find this in my computer: /usr/lib/python2.6/dist-packages/tables$ How should I know which version of PyTables has been installed? What is the command? Well, there are more generic ways depending on how you installed it, but for this particular package: python -c 'from tables.table import obversion; print obversion' Which version should I download to solve the problem? Dunno exactly, but based on the dates, it was fixed before 2.1.2 And could you please give me the website link to download it because I am afraid I can not find the right place exactly. Might as well just go for the latest version: http://www.pytables.org/download/preliminary/pytables-2.2b3/tables-2.2b3.tar.gz Cheers, Chris -- http://blog.rebertia.com -- Best regards, HAN Tingting ETSI de Telecomunicación - office C-203-1 Dpto. Ingeniería Electrónica Ciudad Universitaria s/n Madrid 28040, Spain TEL: +34 65 232 4340 Department of Photoelectric Information Engineering Zhejiang University Hangzhou 310027, P. R.China -- http://mail.python.org/mailman/listinfo/python-list
Re: Python compiled modules are too big in size (even after strip)
Hi Jon, I do have a limited skill sets in c/c++ and also new on linux. I think I am missing some flags or anything when I am compiling python from sources. Still hoping that some one point me out the missing link. Cheers Prashant -- http://mail.python.org/mailman/listinfo/python-list
Re: Engineering numerical format PEP discussion
On Apr 25, 10:19 pm, Chris Rebert c...@rebertia.com wrote: On Sun, Apr 25, 2010 at 9:42 PM, Keith keith.braff...@gmail.com wrote: On Apr 26, 12:02 am, Chris Rebert c...@rebertia.com wrote: On Sun, Apr 25, 2010 at 8:36 PM, Keith keith.braff...@gmail.com wrote: I am considering writing a PEP for the inclusion of an engineering format specifier, and would appreciate input from others. snip Relevant related information: The Decimal datatype supports engineering format directly:http://docs.python.org/library/decimal.html#decimal.Decimal.to_eng_st... Thanks for pointing that out. Does the engineering community get by with the decimal module? Even though this uses the to_eng_string() function, and even though I am using the decimal.Context class: c = decimal.Context(prec=5) decimal.Decimal(1234567).to_eng_string(c) '1234567' That is not an engineering notation string. Apparently either you and the General Decimal Arithmetic spec differ on what constitutes engineering notation, there's a bug in the Python decimal library, or you're hitting some obscure part of the spec's definition. I don't have the expertise to know which is the case. The spec:http://speleotrove.com/decimal/decarith.pdf (to-engineering-string is on page 20 if you're interested) Cheers, Chris --http://blog.rebertia.com As has been pointed out, the Decimal implementation may not have all the features desired (i.e. forcing a particular exponent, or a particular number of significant digits). Perhaps it could be enhanced. The other concern is computational complexity - having to perform complex engineering calculations in Decimal form is presumably more burdensome than in floats. What I've done for years is to have a function that converts an arbitrary float into a string. The function has an optional parameter that specifies the number of digits of the output. Isn't as automatic, of course, probably showing its C origins. -f -- http://mail.python.org/mailman/listinfo/python-list
Re: running .py files on Linux
2010/4/27 Chris Rebert creb...@ucsd.edu 2010/4/27 Chris Rebert c...@rebertia.com On Tue, Apr 27, 2010 at 3:54 AM, Tingting HAN hihigh...@gmail.com wrote: snip gentest_empty.py Traceback (most recent call last): File gentest_empty.py, line 8, in module from tables import * File /usr/lib/python2.6/dist-packages/tables/__init__.py, line 76, in module from tables.file import File, openFile, copyFile File /usr/lib/python2.6/dist-packages/tables/file.py, line 44, in module from tables import hdf5Extension File hdf5Extension.pyx, line 11, in hdf5Extension ImportError: No module named utilsExtension I attach two .py files from the downloaded package in this email. Could you please try running them and see what is the problem? Seems like your version of PyTables may be outdated. Your error looks similar to that described in this (fixed) bug: http://www.pytables.org/trac/ticket/183 What version of PyTables do you have installed? On Tue, Apr 27, 2010 at 5:06 AM, Tingting HAN hihigh...@gmail.com wrote: I apologize that I am new to Linux. I find this in my computer: /usr/lib/python2.6/dist-packages/tables$ How should I know which version of PyTables has been installed? What is the command? Well, there are more generic ways depending on how you installed it, but for this particular package: python -c 'from tables.table import obversion; print obversion' Which version should I download to solve the problem? Dunno exactly, but based on the dates, it was fixed before 2.1.2 And could you please give me the website link to download it because I am afraid I can not find the right place exactly. Might as well just go for the latest version: http://www.pytables.org/download/preliminary/pytables-2.2b3/tables-2.2b3.tar.gz On Tue, Apr 27, 2010 at 8:12 AM, Tingting HAN hihigh...@gmail.com wrote: Well, another person in our lab solved it by using the command: python2.5 configuration.py I do not know exactly why python2.6 in my computer does not work. The code packet I dowloaded was was made in 2007, so maybe old versions of python should work. That's unsurprising. As stated in the bug, the problem is related to a language change that happened in Python 2.6; obviously using an older version of Python would fix that, although you're stuck without the other niceties of v2.6 over v2.5, and without whatever bug fixes have been applied to PyTables since the version you're using. At any rate, glad you got it working. Cheers, Chris -- http://blog.rebertia.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Problems with extra blank line when using csv.writer in Python 3.1
Worked like a charm! Thank you very much. -- http://mail.python.org/mailman/listinfo/python-list
Re: Problems with extra blank line when using csv.writer in Python 3.1
On 4/27/2010 9:05 AM, tkp...@hotmail.com wrote:
I’m experiencing a problem with the csv module in Python 3.1.2, and
would greatly appreciate any help anyone can offer me. When writing
csv files in Python 2.6, I open the output file as 'wb' to prevent a
blank line being inserted after every line. Works like a charm. But I
get an error if I do the same in 3.1; i.e if type the following
sequence of commands:
import csv
outfile = open('c:/temp/test.csv', 'wb')
writer = csv.writer(outfile)
line = [1, 2, 3, 4]
writer.writerow(line)
Traceback (most recent call last):
File pyshell#26, line 1, inmodule
writer.writerow(line)
TypeError: must be bytes or buffer, not str
In 3.x, t vs b modes actually mean to read/write text (str (unicode)) vs
binary (bytes, for instance) objects.
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Re: Python 2.X vs. 3.X - level of acceptance?
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 On 04/27/2010 03:57 AM, Stephan Schulz wrote: Is Python 3 sucessful enough to make a switch worthwhile now? The language/interpreter is just fine. The biggest problem is 3rd party modules. My own module (APSW) has been available since the early betas of Python 3 and I make it available for Python 2.3 onwards. I have a release every month or two, and so you can see adoption trends for Windows users over time: http://code.google.com/p/apsw/downloads/list?can=1q=binary Python 2.6 is by far the most popular, but 3.1 is picking up. It is disturbing just many 2.3 users there still are though. Roger -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.10 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkvXFTUACgkQmOOfHg372QR7YwCgpZdsgkV9iBy/1/8eIBwxy3S4 Sy8AoI8vsivExNADG9Bmx+WbWTQN74VD =0lxT -END PGP SIGNATURE- -- http://mail.python.org/mailman/listinfo/python-list
Re: Download Visual Studio Express 2008 now
I've generally found it wise to grab the ISO images for the express editions collection, and save it somewhere in cold storage. Never have needed to compile Python on Windows, but some modules only support older versions (e.g. 2.4 or 2.5), which is irksome. So it's a good idea to have stuff setup for building extension modules by hand. -- http://mail.python.org/mailman/listinfo/python-list
Re: Engineering numerical format PEP discussion
On Apr 27, 9:03 am, Mark Dickinson dicki...@gmail.com wrote: On Apr 27, 2:16 am, Keith keith.braff...@gmail.com wrote: On Apr 26, 8:47 pm, MRAB pyt...@mrabarnett.plus.com wrote: t for powers of a thousand, perhaps? (Or m?) Both of those letters are fine. I kinda like m for the whole Greco- Roman angle, now that you point it out :-) By the way, there's already a feature request open for this: http://bugs.python.org/issue8060 That might be a good place to hash out the precise semantics. If you could provide unit tests and/or an implementation that would likely help move the issue along. Mark Oh nice! I don't know how I missed that. --Keith Brafford -- http://mail.python.org/mailman/listinfo/python-list
Re: Download Visual Studio Express 2008 now
Martin v. Loewis mar...@v.loewis.de writes: Microsoft has just released Visual Studio 2010, along with its free (of charge) Express edition. Following a tradition, they are likely to withdraw support and availability for VS 2008 Express some time in the future. Python 2.6, 2.7, and 3.1 are all built with that release (i.e. 2008). Because of another long tradition, Python extension modules must be built with the same compiler version (more specifically, CRT version) as Python itself. So to build extension modules for any of these releases, you need to have a copy of VS 2008 or VS 2008 Express. If you are planning to build Python extension modules in the next five years, I recommend that you obtain a copy of VS Express, just in case Microsoft removes it from their servers. As mentioned, it's free of charge. When downloading it for later use, it's probably best to get the offline ISO image release, available from http://www.microsoft.com/express/Downloads/#2008-All Disclaimer: I'm not connected with Microsoft or its release process. Any claim on future actions that Microsoft may take is purely hypothetical. I'm curious to know exactly the differences between the c/c++ compilers you get with various versions of VS and those you get with the (command line only) Windows SDK (formerly called the platform SDK). The windows sdk is a free download. Is the compiler you get the same as the one you get with the full paid version of VS? This web page seems to suggest it might be http://msdn.microsoft.com/en-us/windows/bb980924.aspx -- http://mail.python.org/mailman/listinfo/python-list
Re: Detect OS shutdown or user logout across different operating systems
Hi Tim, Doubt v. much if there's anything x-platform. I recently wrote-up the work done my Klaas Tjebbes (sp?) which I think will do what you want: http://timgolden.me.uk/python/win32_how_do_i/track-session-events.html Looks good - I'll study this code. Thanks for the help! Cheers, Malcolm -- http://mail.python.org/mailman/listinfo/python-list
Oddity with large dictionary (several million entries)
Hi,
I am trying to load files into a dictionary for analysis. the size of the
dictionary will grow quite large (several million entries) and as inserting
into a dictionary is roughly O(n) I figured if I loaded each file into it's
own dictionary it would speed things up. However it did not.
So I decided to write a small test program (attached)
As you can see I am inserting one million entries a time into a map. I ran
the tests where I put all three million entries into one map and one where I
put one million each into it's own map.
What I would have expected is that if I insert one million into it's own map
the time to do that would be roughly constant for each map. Interestingly it
is not. It's about the same as if I load everything into one map.
Oh and I have 4G of RAM and the test consumes about 40% at it's max. I even
run the test on one of our servers with 64G of RAM, so I can rule out
swapping as the issue.
Can anyone explain this oddity? Any insight is highly appreciated.
Here's the output of the test runs:
$ ./dicttest.py -t 0
Inserting into one map
Inserting 100 keys lasted 0:00:26 (38019 1/s)
len(map) 100
Inserting 100 keys lasted 0:01:17 (12831 1/s)
len(map) 200
Inserting 100 keys lasted 0:02:23 (6972 1/s)
len(map) 300
total 300
$ ./dicttest.py -t 1
Inserting into three maps
Inserting 100 keys lasted 0:00:32 (30726 1/s)
len(map) 100
Inserting 100 keys lasted 0:01:29 (11181 1/s)
len(map) 100
Inserting 100 keys lasted 0:02:23 (6957 1/s)
len(map) 100
total 300
Thanks,
Lothar
,[ /home/lothar/tmp/dicttest.py ]
| #!/usr/bin/python
| # -*- coding: utf-8 -*-
|
| import datetime
| import optparse
| import sys
| import time
|
|
|
|
| def fillDict(map, nop, num, guid):
| before = time.time()
|
| for i in xrange(0, num):
| key = (i, guid)
| if not nop:
| map[key] = ([], {})
|
| after = time.time()
| elapsed = (after - before)
| if elapsed = 0:
| divide = 1.0
| else:
| divide = elapsed
| elapsedTime = datetime.timedelta(seconds=int(elapsed))
| print(Inserting %d keys lasted %s (%d 1/s) % (num, elapsedTime, (num /
| divide))) print(len(map) %d % (len(map)))
|
|
| def test0(nop, num):
| print(Inserting into one map)
| map = {}
| fillDict(map, nop, num, 0561c83c-9675-4e6f-bedc-86bcb6acfd71)
| fillDict(map, nop, num, 0561c83c-9675-4e6f-bedc-86bcb6acfd72)
| fillDict(map, nop, num, 0561c83c-9675-4e6f-bedc-86bcb6acfd73)
| print(total %d % (len(map)))
|
|
| def test1(nop, num):
| print(Inserting into three maps)
| map1 = {}
| map2 = {}
| map3 = {}
| fillDict(map1, nop, num, 0561c83c-9675-4e6f-bedc-86bcb6acfd71)
| fillDict(map2, nop, num, 0561c83c-9675-4e6f-bedc-86bcb6acfd72)
| fillDict(map3, nop, num, 0561c83c-9675-4e6f-bedc-86bcb6acfd73)
| total = 0
| for map in [map1, map2, map3]:
| total += len(map)
| print(total %d % (total))
|
|
|
| if __name__ == __main__:
| usage = USAGE: %prog [options]
| description=test
| version=%prog 1.0
|
| parser = optparse.OptionParser(usage=usage, version=version,
| description=description) parser.add_option(
| -t,
| --testnum,
| action=store,
| dest=testnum,
| help=the number of the test to execute,
| type=int,
| default=1
| )
| parser.add_option(
| -i,
| --iterations,
| action=store,
| dest=iterations,
| help=the number of iterations,
| type=int,
| default=100
| )
| parser.add_option(
| -n,
| --nop,
| action=store_true,
| dest=nop,
| help=don't store in the dictionary only load and parse,
| default=False
| )
|
| (options, args) = parser.parse_args()
|
| testmap = {
| 0:test0,
| 1:test1,
| }
|
| test = testmap[options.testnum]
|
| test(options.nop, options.iterations)
`
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Re: Oddity with large dictionary (several million entries)
Lothar Werzinger wrote: Hi, I am trying to load files into a dictionary for analysis. the size of the dictionary will grow quite large (several million entries) and as inserting into a dictionary is roughly O(n) I figured if I loaded each file into it's own dictionary it would speed things up. However it did not. So I decided to write a small test program (attached) As you can see I am inserting one million entries a time into a map. I ran the tests where I put all three million entries into one map and one where I put one million each into it's own map. What I would have expected is that if I insert one million into it's own map the time to do that would be roughly constant for each map. Interestingly it is not. It's about the same as if I load everything into one map. Oh and I have 4G of RAM and the test consumes about 40% at it's max. I even run the test on one of our servers with 64G of RAM, so I can rule out swapping as the issue. Can anyone explain this oddity? Any insight is highly appreciated. Here's the output of the test runs: $ ./dicttest.py -t 0 Inserting into one map Inserting 100 keys lasted 0:00:26 (38019 1/s) len(map) 100 Inserting 100 keys lasted 0:01:17 (12831 1/s) len(map) 200 Inserting 100 keys lasted 0:02:23 (6972 1/s) len(map) 300 total 300 $ ./dicttest.py -t 1 Inserting into three maps Inserting 100 keys lasted 0:00:32 (30726 1/s) len(map) 100 Inserting 100 keys lasted 0:01:29 (11181 1/s) len(map) 100 Inserting 100 keys lasted 0:02:23 (6957 1/s) len(map) 100 total 300 [snip] Inserting into a Python dict is O(1). -- http://mail.python.org/mailman/listinfo/python-list
Re: Oddity with large dictionary (several million entries)
Lothar Werzinger wrote: I am trying to load files into a dictionary for analysis. the size of the dictionary will grow quite large (several million entries) and as inserting into a dictionary is roughly O(n) I figured if I loaded each file into it's own dictionary it would speed things up. However it did not. So I decided to write a small test program (attached) As you can see I am inserting one million entries a time into a map. I ran the tests where I put all three million entries into one map and one where I put one million each into it's own map. What I would have expected is that if I insert one million into it's own map the time to do that would be roughly constant for each map. Interestingly it is not. It's about the same as if I load everything into one map. Oh and I have 4G of RAM and the test consumes about 40% at it's max. I even run the test on one of our servers with 64G of RAM, so I can rule out swapping as the issue. Can anyone explain this oddity? Any insight is highly appreciated. When you are creating objects like there is no tomorrow Python's cyclic garbage collections often takes a significant amount of time. The first thing I'd try is therefore switching it off with import gc gc.disable() Peter -- http://mail.python.org/mailman/listinfo/python-list
ANN: Intro+Intermediate Python course, SF, May 10-12
*** FINAL REMINDER *** Need to get up-to-speed with Python as quickly as possible? Come join me, Wesley Chun, author of Prentice-Hall's bestseller Core Python Programming, for a comprehensive Python course coming up this May in beautiful Northern California! I welcome new Python programmers as well as veterans who may have run into bugs that are difficult to explain and/or who want to learn more about objects, references, and Python's memory model. Come join us if you're looking for *more* than just a vanilla beginners class. Please pass on this note to whomever you think may be interested. I look forward to meeting you and your colleagues! feel free to pass around the flyer below. (Comprehensive) Introduction to Python Mon-Wed, 2010 May 10-12, 9am-5pm - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - (COMPREHENSIVE) INTRO+INTERMEDIATE PYTHON Although this course may appear to those new to Python, it is also perfect for those who have tinkered with it and want to fill in the gaps and/or want to get more in-depth formal training. It combines the best of both an introduction to the language as well as a Python Internals training course. We will immerse you in the world of Python in only a few days, showing you more than just its syntax (which you don't really need a book to learn, right?). Knowing more about how Python works under the covers, including the relationship between data objects and memory management, will make you a much more effective Python programmer coming out of the gate. 3 hands-on labs each day will help hammer the concepts home. Come find out why Google, Yahoo!, Disney, ILM/LucasFilm, VMware, NASA, Ubuntu, YouTube, and Red Hat all use Python. Users supporting or jumping to Plone, Zope, TurboGears, Pylons, Django, Google App Engine, Jython, IronPython, and Mailman will also benefit! PREVIEW 1: you will find (and can download) a video clip of a class session recorded live to get an idea of my lecture style and the interactive classroom environment at: http://cyberwebconsulting.com PREVIEW 2: Partnering with O'Reilly and Pearson, Safari Books Online has asked me to deliver a 1-hour webcast last Spring called What is Python?. This was an online seminar based on a session that I've delivered at numerous conferences in the past. It will give you an idea of lecture style as well as an overview of the material covered in the course. info:http://www.safaribooksonline.com/events/WhatIsPython.html download (reg req'd): http://www.safaribooksonline.com/Corporate/DownloadAndResources/webcastInfo.php?page=WhatIsPython - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - WHERE: near the San Francisco Airport (SFO/San Bruno), CA, USA WEB: http://cyberwebconsulting.com FLYER: http://starship.python.net/crew/wesc/flyerPP1may10.pdf LOCALS: easy freeway (101/280/380) with lots of parking plus public transit (BART and CalTrain) access via the San Bruno stations, easily accessible from all parts of the Bay Area VISITORS: free shuttle to/from the airport, free high-speed internet, free breakfast and regular evening receptions; fully-equipped suites See website for costs, venue info, and registration. Hope to see you there! -- wesley - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Python Web Development with Django, Addison Wesley, (c) 2009 http://withdjango.com wesley.j.chun :: wescpy-at-gmail.com python training and technical consulting cyberweb.consulting : silicon valley, ca http://cyberwebconsulting.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Python compiled modules are too big in size (even after strip)
Le Tue, 27 Apr 2010 02:43:19 -0700, King a écrit : Python is compiled and installed successfully. However the modules(_socket.so, _random.so etc) are two big in terms of file size. They are around 4.5-5.0 mb each. I have used strip strip-all *.so, but still size is around 1.5 mb each. This is way more than it should be. Even if debug mode, most extension modules should be around 100kB or smaller. Am I missing something here? Do I have to re-configure or re-compile the python again from sources? I would suggest to check the compile options gcc gets (look at make output), and try changing them. -- http://mail.python.org/mailman/listinfo/python-list
Re: Oddity with large dictionary (several million entries)
Peter Otten wrote: Lothar Werzinger wrote: Can anyone explain this oddity? Any insight is highly appreciated. When you are creating objects like there is no tomorrow Python's cyclic garbage collections often takes a significant amount of time. The first thing I'd try is therefore switching it off with import gc gc.disable() Peter Wow, that really MAKES a difference! Thanks a lot! $ ~/tmp/dicttest.py -t 0 Inserting into one map Inserting 100 keys lasted 0:00:01 (960152 1/s) len(map) 100 Inserting 100 keys lasted 0:00:01 (846416 1/s) len(map) 200 Inserting 100 keys lasted 0:00:04 (235241 1/s) len(map) 300 total 300 $ ~/tmp/dicttest.py -t 1 Inserting into three maps Inserting 100 keys lasted 0:00:01 (973344 1/s) len(map) 100 Inserting 100 keys lasted 0:00:00 (1011303 1/s) len(map) 100 Inserting 100 keys lasted 0:00:00 (1021796 1/s) len(map) 100 total 300 ~/beacon Thanks! -- Lothar -- http://mail.python.org/mailman/listinfo/python-list
Re: pyjamas 0.7 released
On Apr 26, 11:25 pm, Patrick Maupin pmau...@gmail.com wrote: On Apr 26, 4:12 pm, lkcl luke.leigh...@googlemail.com wrote: and, given that you can use AJAX (e.g. JSONRPC) to communicate with a server-side component, installed on 127.0.0.1 and effectively do the exact same thing, nobody bothers. I suppose, but again, that pushes off the security thing. There are a lot of obvious ways to make unintended security holes in a 127.0.0.1 application, not to an experienced web developer. by starting the browser at a URL which can only used once, you can effectively do the same trick that X-Server X-Auth magic cookies does. so I'm sure there are also a lot of ways that would be unobvious to this security non-expert. And, of course, the real dealbreaker is, it still requires a separate install. not necessarily. luis pamirez created pygtkweb (a reimplementation of gtk widgets, to be compiled to javascript, to run in a web browser) and he created it as a stand-alone app that 1) fired off a web browser 2) ran a small cgi-bin-esque web service 3) served static (pre- compiled) pages 4) served AJAX to the compiled app. with pyjd, that step 1 can be bypassed or more specifically step 1 and 2 can be combined into the _one_ python app (two threads / processes); you effectively combine the start the window with the browser engine in it step with the start a mini web server step. so it can be done: it's just not immediately obvious. l. -- http://mail.python.org/mailman/listinfo/python-list
How to check what is holding reference to object
Hi I've just found out that one of objects is not destroyed when it should be. This means that something was holding reference to this object or part of it (i.e. method). Is there any way to check what holds that reference? I am unable to do that just looking to the code or debugging it because it is pretty complicated, but I am able to invoke this situation again. Regards Michal M. -- http://mail.python.org/mailman/listinfo/python-list
Re: How to check what is holding reference to object
Michal, May I ask why do you care about the object's management? Let Python worry about that. What's your use case? -- http://mail.python.org/mailman/listinfo/python-list
Re: How to check what is holding reference to object
I've just found out that one of objects is not destroyed when it should be. This means that something was holding reference to this object or part of it (i.e. method). Is there any way to check what holds that reference? I am unable to do that just looking to the code or debugging it because it is pretty complicated, but I am able to invoke this situation again. I don't think that's possible, since that would mean Python would need to keep a reference to the object holding the reference, which seems pretty awkward. You can however, obtain the number of referencing objects using sys.getrefcount(object). You have to subtract 1 from the result, as the function itself of course holds a reference to at the moment it is being called. Almar -- http://mail.python.org/mailman/listinfo/python-list
Re: How to check what is holding reference to object
On Tue, Apr 27, 2010 at 1:45 PM, Michal M mich.mier...@googlemail.com wrote: I've just found out that one of objects is not destroyed when it should be. This means that something was holding reference to this object or part of it (i.e. method). Is there any way to check what holds that reference? I am unable to do that just looking to the code or debugging it because it is pretty complicated, but I am able to invoke this situation again. gc.get_referrers(your_object) ? Docs: http://docs.python.org/library/gc.html#gc.get_referrers Cheers, Chris -- Thanks for having me learn something new today! http://blog.rebertia.com -- http://mail.python.org/mailman/listinfo/python-list
Re: How to check what is holding reference to object
Michal M mich.mier...@googlemail.com wrote: Hi I've just found out that one of objects is not destroyed when it should be. This means that something was holding reference to this object or part of it (i.e. method). Is there any way to check what holds that reference? I am unable to do that just looking to the code or debugging it because it is pretty complicated, but I am able to invoke this situation again. See if this code helps: http://groups.google.com/group/comp.lang.python/browse_thread/thread/394ba5b48f83ebfb/237dc92f3629dd9a#237dc92f3629dd9a It's pretty old so it may need some adjustment, but I wrote it to figure out exactly that sort of problem. -- http://mail.python.org/mailman/listinfo/python-list
Re: How to check what is holding reference to object
On 27 Kwi, 23:21, Duncan Booth duncan.bo...@invalid.invalid wrote: Michal M mich.mier...@googlemail.com wrote: Hi I've just found out that one of objects is not destroyed when it should be. This means that something was holding reference to this object or part of it (i.e. method). Is there any way to check what holds that reference? I am unable to do that just looking to the code or debugging it because it is pretty complicated, but I am able to invoke this situation again. See if this code helps: http://groups.google.com/group/comp.lang.python/browse_thread/thread/... It's pretty old so it may need some adjustment, but I wrote it to figure out exactly that sort of problem. Thanks you for answers. I tried to use gc.get_referrers(self) in point in code when according to me object should be destroyed earlier but I did not see anything interesting. Then just realised that gc will not destroy object even when itself holds reference to his own method. For example class A(object): def a(self): pass def b(self): self.method = self.a def __del__(self): print A object deleted a = A() del a A object delted a = A() a.b() del a ... nothing ... I thought gc would discover such circle loops but apparently it did not. -- http://mail.python.org/mailman/listinfo/python-list
Re: How to check what is holding reference to object
On Tue, Apr 27, 2010 at 2:42 PM, Michal M mich.mier...@googlemail.com wrote: On 27 Kwi, 23:21, Duncan Booth duncan.bo...@invalid.invalid wrote: Michal M mich.mier...@googlemail.com wrote: I've just found out that one of objects is not destroyed when it should be. This means that something was holding reference to this object or part of it (i.e. method). Is there any way to check what holds that reference? I am unable to do that just looking to the code or debugging it because it is pretty complicated, but I am able to invoke this situation again. See if this code helps: http://groups.google.com/group/comp.lang.python/browse_thread/thread/... It's pretty old so it may need some adjustment, but I wrote it to figure out exactly that sort of problem. Thanks you for answers. I tried to use gc.get_referrers(self) in point in code when according to me object should be destroyed earlier but I did not see anything interesting. Then just realised that gc will not destroy object even when itself holds reference to his own method. For example class A(object): def a(self): pass def b(self): self.method = self.a def __del__(self): print A object deleted a = A() del a A object delted a = A() a.b() del a ... nothing ... I thought gc would discover such circle loops but apparently it did not. No, it does, you just didn't give it long enough; for performance reasons, cyclical GC is only done every so often: from weakref import ref class A(object): ... def a(self): ...pass ... def b(self): ...self.method = self.a ... a = A() def bye(x): print BYE:, x ... b = ref(a, bye) del a BYE: weakref at 0x377990; dead a = A() b = ref(a, bye) a.b() del a #indeed, it didn't get GC-ed immediately from gc import collect collect() #but if we force a cyclical GC run... BYE: weakref at 0x4441b0; dead Cheers, Chris -- http://blog.rebertia.com -- http://mail.python.org/mailman/listinfo/python-list
Re: How to check what is holding reference to object
On Tue, Apr 27, 2010 at 2:58 PM, Chris Rebert c...@rebertia.com wrote: On Tue, Apr 27, 2010 at 2:42 PM, Michal M mich.mier...@googlemail.com wrote: On 27 Kwi, 23:21, Duncan Booth duncan.bo...@invalid.invalid wrote: Michal M mich.mier...@googlemail.com wrote: I've just found out that one of objects is not destroyed when it should be. This means that something was holding reference to this object or part of it (i.e. method). Is there any way to check what holds that reference? I am unable to do that just looking to the code or debugging it because it is pretty complicated, but I am able to invoke this situation again. See if this code helps: http://groups.google.com/group/comp.lang.python/browse_thread/thread/... It's pretty old so it may need some adjustment, but I wrote it to figure out exactly that sort of problem. Thanks you for answers. I tried to use gc.get_referrers(self) in point in code when according to me object should be destroyed earlier but I did not see anything interesting. Then just realised that gc will not destroy object even when itself holds reference to his own method. For example class A(object): def a(self): pass def b(self): self.method = self.a def __del__(self): print A object deleted a = A() del a A object delted a = A() a.b() del a ... nothing ... I thought gc would discover such circle loops but apparently it did not. No, it does, you just didn't give it long enough; for performance reasons, cyclical GC is only done every so often: Addendum: Also, defining __del__ in your example was likely problematic: See http://docs.python.org/library/gc.html#gc.garbage - Chris -- http://mail.python.org/mailman/listinfo/python-list
Re: Cross-platform way to retrieve the current (Operative system) DNS server IP address in python
On 24 Abr, 14:50, DarkBlue pict...@gmail.com wrote:
On Apr 22, 4:55 pm, joamag joa...@gmail.com wrote:
Does anybody know a cross platform way to retrieve the default DNS
server IP address in python ?
Thanks !
João
import os,urllib2,re
def getIpAddr():
Function for parsing external ip adress by pinging dyndns.com
External_IP=urllib2.urlopen('http://checkip.dyndns.com/').read()
m = re.search(r(([0-9]+\.){3}[0-9]+), External_IP)
my_IP= m.group(1)
return my_IP
print('Current Ip from DynDns : %s ') % getIpAddr()
this gets you your ip address
hope it helps.
Hi,
It's not my ip address that I want to discover... I want to discover
my default dns server ip address.
This ip is stored in an operative system basis.
Dos anyone know how to get it ?
--
http://mail.python.org/mailman/listinfo/python-list
Re: Download Visual Studio Express 2008 now
I'm curious to know exactly the differences between the c/c++ compilers you get with various versions of VS and those you get with the (command line only) Windows SDK (formerly called the platform SDK). The windows sdk is a free download. Is the compiler you get the same as the one you get with the full paid version of VS? This web page seems to suggest it might be http://msdn.microsoft.com/en-us/windows/bb980924.aspx The primary difference is the CRT version that it ships with. Also, one difference is whether it ships with a compiler at all. For a long time, the SDK didn't include a compiler at all. Then, for several years, it included an Itanium compiler and an AMD64 compiler, but no x86 compiler. Now it does, and I don't know what CRT version it links with (at some point, the SDK would link with crtdll.dll, then msvcrt.dll, but it's some other version now). In any case, AFAIK, the SDK binaries will be linked with one specific version of the CRT, which may or may not be the same as the one used in one specific version of Visual Studio. HTH, Martin -- http://mail.python.org/mailman/listinfo/python-list
How to use a class property to store function variables?
I want to store a reference to a function into a class property. So I am expecting that: class A: fn = lambda x: x fn = A.fn fn(1) Traceback (most recent call last): File string, line 1, in string TypeError: unbound method lambda() must be called with A instance as first argument (got int instance instead) The problem is that A.fn is treated as a bounded method. I really want A.fn to be a variable that stores a reference to a function. Is there any way to achieve this? Thanks, GZ -- http://mail.python.org/mailman/listinfo/python-list
Re: How to use a class property to store function variables?
On Tue, Apr 27, 2010 at 4:36 PM, GZ zyzhu2...@gmail.com wrote: I want to store a reference to a function into a class property. So I am expecting that: class A: fn = lambda x: x fn = A.fn fn(1) Traceback (most recent call last): File string, line 1, in string TypeError: unbound method lambda() must be called with A instance as first argument (got int instance instead) The problem is that A.fn is treated as a bounded method. I really want A.fn to be a variable that stores a reference to a function. Is there any way to achieve this? Use the staticmethod() decorator: class A(object): @staticmethod def fn(x): return x #rest same as before Cheers, Chris -- http://blog.rebertia.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Cross-platform way to retrieve the current (Operative system) DNS server IP address in python
maybe this helps you:
http://pypi.python.org/pypi/netifaces/0.3
best regards,
Katcipis
On Tue, Apr 27, 2010 at 7:49 PM, joamag joa...@gmail.com wrote:
On 24 Abr, 14:50, DarkBlue pict...@gmail.com wrote:
On Apr 22, 4:55 pm, joamag joa...@gmail.com wrote:
Does anybody know a cross platform way to retrieve the default DNS
server IP address in python ?
Thanks !
João
import os,urllib2,re
def getIpAddr():
Function for parsing external ip adress by pinging dyndns.com
External_IP=urllib2.urlopen('http://checkip.dyndns.com/').read(http://checkip.dyndns.com/%27%29.read%28
)
m = re.search(r(([0-9]+\.){3}[0-9]+), External_IP)
my_IP= m.group(1)
return my_IP
print('Current Ip from DynDns : %s ') % getIpAddr()
this gets you your ip address
hope it helps.
Hi,
It's not my ip address that I want to discover... I want to discover
my default dns server ip address.
This ip is stored in an operative system basis.
Dos anyone know how to get it ?
--
http://mail.python.org/mailman/listinfo/python-list
--
http://mail.python.org/mailman/listinfo/python-list
PyCon Australia CFP: One Day Left!
The Call For Proposals for PyCon Australia 2010 FINISHES TOMORROW! Presentation subjects may range from reports on open source, academic and commercial projects to tutorials and case studies. As long as a presentation is interesting and potentially useful to the Python community, it will be considered for inclusion in the program. We're especially interested in short presentations that will teach conference-goers something new and useful. Can you show attendees how to use a module? Explore a Python language feature? Package an application? Submit your proposal here: http://pycon-au.org/cfp As always, please pass this message on to people you feel will find it interesting. Richard Jones PyCon Australia 2010 http://pycon-au.org/ -- http://mail.python.org/mailman/listinfo/python-list
Re: How to use a class property to store function variables?
On 4/27/2010 7:36 PM, GZ wrote: I want to store a reference to a function into a class property. So I am expecting that: class A: fn = lambda x: x fn = A.fn fn(1) Traceback (most recent call last): File string, line 1, instring TypeError: unbound methodlambda() must be called with A instance as first argument (got int instance instead) The problem is that A.fn is treated as a bounded method. I really want A.fn to be a variable that stores a reference to a function. Is there any way to achieve this? Use 3.1, though you will have the same issue when calling it and same fix that Chris gave. Terry Jan Reedy -- http://mail.python.org/mailman/listinfo/python-list
Re: Oddity with large dictionary (several million entries)
Lothar Werzinger lothar at tradescape.biz writes: Wow, that really MAKES a difference! Thanks a lot! You should also try Python 2.7 or 3.1. We've recently optimized the garabage collector for situations where many objects are being created. -- http://mail.python.org/mailman/listinfo/python-list
Re: How to use a class property to store function variables?
Hi Chris, On Apr 27, 6:43 pm, Chris Rebert c...@rebertia.com wrote: On Tue, Apr 27, 2010 at 4:36 PM, GZ zyzhu2...@gmail.com wrote: I want to store a reference to a function into a class property. So I am expecting that: class A: fn = lambda x: x fn = A.fn fn(1) Traceback (most recent call last): File string, line 1, in string TypeError: unbound method lambda() must be called with A instance as first argument (got int instance instead) The problem is that A.fn is treated as a bounded method. I really want A.fn to be a variable that stores a reference to a function. Is there any way to achieve this? Use the staticmethod() decorator: class A(object): @staticmethod def fn(x): return x #rest same as before Cheers, Chris --http://blog.rebertia.com- Hide quoted text - - Show quoted text - I do not think it will help me. I am not trying to define a function fn() in the class, but rather I want to make it a function reference so that I can initialize it any way I like later. For example, I want to be able to write the following: A.fn = lambda x : x*x f = A.fn f(1) A.fn = lambda x : x^2 f= A.fn f(2) In other words, I want to make A.fn a reference to a function not known to me at the time I define class A. I want to be able to initialize it later. -- http://mail.python.org/mailman/listinfo/python-list
Ignoring XML Namespaces with cElementTree
Is there any way to configure cElementTree to ignore the XML root namespace? Default cElementTree (Python 2.6.4) appears to add the XML root namespace URI to _every_ single tag. I know that I can strip URIs manually, from every tag, but it is a rather idiotic thing to do (performance wise). -- http://mail.python.org/mailman/listinfo/python-list
Simple game like graphics
I am working on a simulation of a bicycle race. I would like a very simple real time graphic of the position of the bicycles during the simulation and a few of the key values. I will not be iterating with the simulation while it is running. I am not really sure where to start. Currently to watch the values of the variables I just print them at intervals. I know there are many option to do this. For me, I would like the option that would be quick, easy and few lines of code. I am not sure of a better way to describe my requirements. Any suggestions would be great especially if you have a tutorial/documentation you would recommend. Thanks *Vincent Davis 720-301-3003 * vinc...@vincentdavis.net my blog http://vincentdavis.net | LinkedInhttp://www.linkedin.com/in/vincentdavis -- http://mail.python.org/mailman/listinfo/python-list
Re: How to use a class property to store function variables?
Terry Reedy wrote: On 4/27/2010 7:36 PM, GZ wrote: I want to store a reference to a function into a class property. So I am expecting that: class A: fn = lambda x: x fn = A.fn fn(1) Traceback (most recent call last): File string, line 1, instring TypeError: unbound methodlambda() must be called with A instance as first argument (got int instance instead) The problem is that A.fn is treated as a bounded method. I really want A.fn to be a variable that stores a reference to a function. Is there any way to achieve this? Use 3.1, though you will have the same issue when calling it and same fix that Chris gave. Python 3.1.1 (r311:74483, Aug 17 2009, 17:02:12) [MSC v.1500 32 bit (Intel)] on win32 Type copyright, credits or license() for more information. class A: fn = lambda x: x fn = A.fn fn(1) 1 -- http://mail.python.org/mailman/listinfo/python-list
assigning multi-line strings to variables
Hi, This is undoubtedly a newbie question. How doI assign variables multiline strings? If I try this i get what's cited below. Thanks. d=d d d Traceback (most recent call last): File interactive input, line 1, in module NameError: name 'd' is not defined -- http://mail.python.org/mailman/listinfo/python-list
Re: How to use a class property to store function variables?
GZ zyzhu2...@gmail.com wrote: I do not think it will help me. I am not trying to define a function fn() in the class, but rather I want to make it a function reference so that I can initialize it any way I like later. It always helps to try an idea out before dismissing it out of hand. Experimentation in the interpreter is cheap and easy. class A(object): ... fn = staticmethod(lambda x: x*x) ... A.fn(10) 100 A.fn = staticmethod(lambda x: x**x) A.fn(3) 27 def third(x): return x/3 ... A.fn = staticmethod(third) A.fn(9) 3 However, I'm assuming you're wanting to do something like this: class B(object): ... def act(self): ... print self.fn() That is, providing a hook in .act() that you can redefine on demand. If so, note that you only need to decorate functions as staticmethods if you're assigning them to the class. If you intend on overriding on _instances_, you don't: B.fn = staticmethod(lambda: 'one') # assign on class b = B() # instantiate b.act() # act on instance one B.fn = staticmethod(lambda: 'two') # assign on class b.act() # existing instance calls new version on class two b.fn = staticmethod(lambda: 'three') # assign on instance b.act() Traceback (most recent call last): File stdin, line 1, in module File stdin, line 3, in act TypeError: 'staticmethod' object is not callable b.fn = lambda: 'three' # look Ma, no staticmethod! b.act() three Incidentally, this is known as the Strategy pattern, and you can see a simple example of it in Python here: http://en.wikipedia.org/wiki/Strategy_pattern#Python Hope this helps. -- http://mail.python.org/mailman/listinfo/python-list
Re: assigning multi-line strings to variables
goldtech wrote: Hi, This is undoubtedly a newbie question. How doI assign variables multiline strings? If I try this i get what's cited below. Thanks. d=d d d Traceback (most recent call last): File interactive input, line 1, in module NameError: name 'd' is not defined Use a triple-quoted string literal: d = d ... d d 'd\nd' -- http://mail.python.org/mailman/listinfo/python-list
Re: assigning multi-line strings to variables
On Apr 27, 7:20 pm, goldtech goldt...@worldpost.com wrote: Hi, This is undoubtedly a newbie question. How doI assign variables multiline strings? If I try this i get what's cited below. Thanks. d=d d d Traceback (most recent call last): File interactive input, line 1, in module NameError: name 'd' is not defined d = d\ d or d = dd\ dd You don't need the trailing slash in the first example if you are writing this in a script, python assumes it. -- http://mail.python.org/mailman/listinfo/python-list
Re: Python 2.X vs. 3.X - level of acceptance?
Roger Binns wrote: On 04/27/2010 03:57 AM, Stephan Schulz wrote: Is Python 3 sucessful enough to make a switch worthwhile now? The language/interpreter is just fine. The biggest problem is 3rd party modules. Indeed. Python 3 is a good language, and the CPython interpreter is in good shape, but many key modules aren't ready for prime time under Python 3 yet. For teaching purposes, I'd teach Python 3. Most Python 3 code will run in 2.6/2.7, more or less. I have a Python 3.1 installed for fun, but I can't actually do much useful with it until the MySQLdb module fully supports it. John Nagle -- http://mail.python.org/mailman/listinfo/python-list
Re: assigning multi-line strings to variables
On Apr 27, 7:31 pm, Brendan Abel 007bren...@gmail.com wrote: On Apr 27, 7:20 pm, goldtech goldt...@worldpost.com wrote: Hi, This is undoubtedly a newbie question. How doI assign variables multiline strings? If I try this i get what's cited below. Thanks. d=d d d Traceback (most recent call last): File interactive input, line 1, in module NameError: name 'd' is not defined d = d\ d or d = dd\ dd You don't need the trailing slash in the first example if you are writing this in a script, python assumes it. Thanks but what if the string is 500 lines. Seems it would be hard to put a \ manually at the end of every line. How could i do that? -- http://mail.python.org/mailman/listinfo/python-list
Re: assigning multi-line strings to variables
On Apr 27, 7:33 pm, MRAB pyt...@mrabarnett.plus.com wrote: goldtech wrote: Hi, This is undoubtedly a newbie question. How doI assign variables multiline strings? If I try this i get what's cited below. Thanks. d=d d d Traceback (most recent call last): File interactive input, line 1, in module NameError: name 'd' is not defined Use a triple-quoted string literal: d = d ... d d 'd\nd' Only seems to work when there's a '... ' on the 2nd line. I need a way to assign large blocks of text to a variable w/out special formatting. Thanks. -- http://mail.python.org/mailman/listinfo/python-list
Re: assigning multi-line strings to variables
On Tue, Apr 27, 2010 at 10:51 PM, goldtech goldt...@worldpost.com wrote: On Apr 27, 7:33 pm, MRAB pyt...@mrabarnett.plus.com wrote: goldtech wrote: Hi, This is undoubtedly a newbie question. How doI assign variables multiline strings? If I try this i get what's cited below. Thanks. d=d d d Traceback (most recent call last): File interactive input, line 1, in module NameError: name 'd' is not defined Use a triple-quoted string literal: d = d ... d d 'd\nd' Only seems to work when there's a '... ' on the 2nd line. I need a way to assign large blocks of text to a variable w/out special formatting. Thanks. -- Neither the '...' or the '' on the other lines have anything to do with Python, it's just a convenience thing when you're using the interactive shell. means you're on the first line of an expression and ... means you're in the middle of a multi-line block. When you actually write scripts, they aren't there. $ cat test.py d = dd ddd ddd ddd print d $ python test.py dd ddd ddd ddd http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: assigning multi-line strings to variables
On Tue, Apr 27, 2010 at 10:51 PM, goldtech goldt...@worldpost.com wrote: On Apr 27, 7:33 pm, MRAB pyt...@mrabarnett.plus.com wrote: goldtech wrote: Hi, This is undoubtedly a newbie question. How doI assign variables multiline strings? If I try this i get what's cited below. Thanks. d=d d d Traceback (most recent call last): File interactive input, line 1, in module NameError: name 'd' is not defined Use a triple-quoted string literal: d = d ... d d 'd\nd' Only seems to work when there's a '... ' on the 2nd line. I need a way to assign large blocks of text to a variable w/out special formatting. Thanks. The '...' is the interpreter's way of telling you that you are in a block, e.g. a function definition, with statement, etc. The '\n' you see in the middle of the string is the newline character. If you try to print the string, the expected happens: d = ... ddd d '\nddd' print(d) ddd Geremy Condra -- http://mail.python.org/mailman/listinfo/python-list
Re: assigning multi-line strings to variables
goldtech wrote: On Apr 27, 7:33 pm, MRAB pyt...@mrabarnett.plus.com wrote: goldtech wrote: Hi, This is undoubtedly a newbie question. How doI assign variables multiline strings? If I try this i get what's cited below. Thanks. d=d d d Traceback (most recent call last): File interactive input, line 1, in module NameError: name 'd' is not defined Use a triple-quoted string literal: d = d ... d d 'd\nd' Only seems to work when there's a '... ' on the 2nd line. I need a way to assign large blocks of text to a variable w/out special formatting. Thanks. I copied it from an interactive session in IDLE. In an actual script I would write: text = first line second line third line -- http://mail.python.org/mailman/listinfo/python-list
Re: assigning multi-line strings to variables
goldtech goldt...@worldpost.com writes: Only seems to work when there's a '... ' on the 2nd line. You seem to be confused by the presentation of the interactive interpreter. That text is a prompt. I need a way to assign large blocks of text to a variable w/out special formatting. That's what triple-quoted string syntax is for. You would do well to work through the entirety of the Python tutorial URL:http://docs.python.org/tutorial/. Take the time to actually perform each exercise and experiment until you understand the concept being presented, before moving on. -- \ “I find the whole business of religion profoundly interesting. | `\ But it does mystify me that otherwise intelligent people take | _o__)it seriously.” —Douglas Adams | Ben Finney -- http://mail.python.org/mailman/listinfo/python-list
Re: SWIG + expy
From: Stefan Behnel stefan...@behnel.de Subject: Re: SWIG + expy To: python-list@python.org Date: Tuesday, April 27, 2010, 11:57 AM Yingjie Lan, 27.04.2010 08:30: Is it possible to use SWIG to parse C/C++, and provide an interface for me to generate some code? I thought it might be good to have SWIG help generate expy files, then generate the python extension via expy. There have been similar discussions on the Cython mailing list (you might want to search the archives). The main theme seems to be that clang provides a suitable parser, and several people have used it to write up a code generator for their specific needs (you might want to look at those). Thank you very much, I will take a look at this. BTW, is there a similar project going on for Cython? Yingjie -- http://mail.python.org/mailman/listinfo/python-list
Re: assigning multi-line strings to variables
Use triple quote: d = this is a sample text which does not mean anything goldtech goldt...@worldpost.com wrote in message news:4e25733e-eafa-477b-a84d-a64d139f7...@u34g2000yqu.googlegroups.com... On Apr 27, 7:31 pm, Brendan Abel 007bren...@gmail.com wrote: On Apr 27, 7:20 pm, goldtech goldt...@worldpost.com wrote: Hi, This is undoubtedly a newbie question. How doI assign variables multiline strings? If I try this i get what's cited below. Thanks. d=d d d Traceback (most recent call last): File interactive input, line 1, in module NameError: name 'd' is not defined d = d\ d or d = dd\ dd You don't need the trailing slash in the first example if you are writing this in a script, python assumes it. Thanks but what if the string is 500 lines. Seems it would be hard to put a \ manually at the end of every line. How could i do that? -- http://mail.python.org/mailman/listinfo/python-list
Re: assigning multi-line strings to variables
On 28.04.2010 07:11, * Sagar K: Use triple quote: d = this is a sample text which does not mean anything goldtechgoldt...@worldpost.com wrote in message news:4e25733e-eafa-477b-a84d-a64d139f7...@u34g2000yqu.googlegroups.com... On Apr 27, 7:31 pm, Brendan Abel007bren...@gmail.com wrote: On Apr 27, 7:20 pm, goldtechgoldt...@worldpost.com wrote: Hi, This is undoubtedly a newbie question. How doI assign variables multiline strings? If I try this i get what's cited below. Thanks. d=d d d Traceback (most recent call last): File interactive input, line 1, inmodule NameError: name 'd' is not defined d = d\ d or d = dd\ dd You don't need the trailing slash in the first example if you are writing this in a script, python assumes it. Thanks but what if the string is 500 lines. Seems it would be hard to put a \ manually at the end of every line. How could i do that? That depends. You can put the string in a separate text file and read the file, or you can have it as a literal. For the latter your editor should provide you with the tools to format the string any which way you want, and if not, then just a write a Python script to format it for you. Consider this little example[1]: code file=jabberwocky.py The Jabberwocky poem, by Lewis Carrol text = ( 'Twas brillig, and the slithy toves\n Did gyre and gimble in the wabe;\n All mimsy were the borogoves,\n And the mome raths outgrabe.\n \n \Beware the jabberwock, my son!\n The jaws that bite, the claws that catch!\n Beware the jubjub bird, and shun\n The frumious bandersnatch!\\n \n He took his vorpal sword in hand:\n Long time the manxome foe he sought--\n So rested he by the tumtum tree,\n And stood awhile in thought.\n \n And as in uffish thought he stood,\n The jabberwock, with eyes of flame,\n Came whiffling through the tulgey wood,\n And burbled as it came!\n \n One, two! one, two! and through and through\n The vorpal blade went snicker-snack!\n He left it dead, and with its head\n He went galumphing back.\n \n \And hast thou slain the jabberwock?\n Come to my arms, my beamish boy!\n O frabjous day! callooh! callay!\\n He chortled in his joy.\n \n 'Twas brillig, and the slithy toves\n Did gyre and gimble in the wabe;\n All mimsy were the borogoves,\n And the mome raths outgrabe. ) /code This defines /one/ string value, using compile time concatenation (any adjacent string literals are concatenated at compile time, in Python[2] and in C++). The text was just copied and pasted from Wikipedia, and subjected to a few well chosen keystrokes in an editor. As a hopefully illuminating exercise, consider a Python program that uses this string (just import the above module and use its 'text') and generates the above source code as output. Cheers hth., - Alf Notes: [1] From an example at the end of chapter 2 at url: http://tinyurl.com/programmingbookP3. [2] I'm not sure how well that plays with Python doc strings; haven't tried. -- http://mail.python.org/mailman/listinfo/python-list
[issue8545] i didn't get rqrd output for programme in python?(plz... help)
Georg Brandl ge...@python.org added the comment: Please use python-h...@python.org or comp.lang.python for usage questions, not the tracker. -- nosy: +georg.brandl resolution: - invalid status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8545 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue1462525] URI parsing library
Paul Jimenez p...@place.org added the comment: Since no one else has commented on this in over a year, and the new (2.6+) code works fine, I'll just close this to help clean things up. -- status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue1462525 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8128] String interpolation with unicode subclass fails to call __str__
Georg Brandl ge...@python.org added the comment:
In Python 2.x, __unicode__ is called instead of __str__. Whether that's
correct behavior, I'm not sure, but at least it is consistent with
{}.format(K()).
In Python 3.x, __unicode__ doesn't exist and __str__ isn't called; but for
{}.format(K()), it is. Therefore I think here a fix should be made in any
case.
Benjamin, what do you think?
--
assignee: - benjamin.peterson
nosy: +benjamin.peterson, georg.brandl
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http://bugs.python.org/issue8128
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[issue4037] doctest.py should include method descriptors when looking inside a class __dict__
Georg Brandl ge...@python.org added the comment: So for staticmethods and classmethods, valname doesn't need to be reassigned? -- nosy: +georg.brandl ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue4037 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8546] The parameter buffering in _pyio.open doesn't work the same as in the builtin open
New submission from Patrick Sabin patricksa...@gmx.at: As far as I understand the _pyio.open function should resemble the builtin open, but in case of the buffering parameter, it doesn't. The builtin version doesn't allow None as argument, but this is the default in the _pyio.open signature. I attached a patch, which changes the default value of the buffering parameter to -1, which is the default in the builtin version. -- assignee: d...@python components: Documentation, Library (Lib) files: change_pyio_open_buffering_parameter.diff keywords: patch messages: 104301 nosy: d...@python, pyfex priority: normal severity: normal status: open title: The parameter buffering in _pyio.open doesn't work the same as in the builtin open type: behavior versions: Python 3.1, Python 3.2, Python 3.3 Added file: http://bugs.python.org/file17103/change_pyio_open_buffering_parameter.diff ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8546 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7384] curses crash on FreeBSD
Stefan Krah stefan-use...@bytereef.org added the comment: Roumen Petrov rep...@bugs.python.org wrote: Yes , I understand . For the protocol did gcc on FreeBSD warn if library order is -lncursesw -lreadline ? No. P.S. Issue with readline library linked to termcap compatible library on system that distribute more then one termcap compatible library is about 10 years old. I didn't want to touch the termcap logic. There's potential for breakage, and a real investigation would be time consuming. (There's a needless warning on Tiger about /usr/lib/termcap that could be fixed in another issue.) -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7384 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
