Reminder: 6 days left for EuroPython 2010 talk submissions
The EuroPython 2010 call for papers closes this Friday on 30th April. We've already had many submissions covering Python 3, Python 2.7, IronPython, Game Programming, Testing, Behavior Driven Development, NoSQL, Accessiblilty and others. We still are looking for talks and tutorials on Django, PyPy, Twisted, HTML5, Unladen Swallow, Testing and whatever you wish to present. http://www.europython.eu/submission/ EuroPython -- This year EuroPython will be held from the 17th to 24th July in Birmingham, UK. It will include over 100 talks, tutorials, sprints and social events. Confirmed speakers so far include Guido van Rossum, Raymond Hettinger and Brett Cannon. http://www.europython.eu Registration Registration is open now. For the best registration rates, book early! Early Bird rate is open until 10th May. Speakers can attend at the discounted rate Speaker Rate. http://www.europython.eu/registration/ Help Us Out --- EuroPython is run by volunteers, like you! We could use a hand, and any contribution is welcome. Go to http://wiki.europython.eu/Helping to join us! Go to http://www.europython.eu/contact/ to contact us directly! Sponsors Sponsoring EuroPython is a unique opportunity to affiliate with this prestigious conference and to reach a large number of Python users from computing professionals to academics, from entrepreneurs to motivated and well-educated job seekers. http://www.europython.eu/sponsors/ Spread the Word --- We are a community-run not-for-profit conference. Please help to spread the word by distributing this announcement to colleagues, project mailing lists, friends, your blog, Web site, and through your social networking connections. Take a look at our publicity resources: http://wiki.europython.eu/Publicity General Information --- For more information about the conference, please visit the official site: http://www.europython.eu/ Looking forward to see you! The EuroPython Team -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
[ANN] pyjamas 0.7 released
pyjamas - the stand-alone python-to-javascript compiler, and separate GUI Widget Toolkit, has its 0.7 release, today. this has been much delayed, in order to allow the community plenty of time between the 0.7pre2 release and the final release, to review and test all the examples. pyjamas allows developers to create applications that will run either in any modern web browser (with no plugins required) or as a stand-alone cross-platform desktop application (like PyQT4 or PyGTK2), WITHOUT requiring modifications to the original python source. this concept is singularly unique in the free software python world, but is conceptually similar to Adobe AIR and Silverlight - without the massive plugins required. there has been significant improvements, features and libraries added in between 0.6 and 0.7: please see the README in the distribution for details. for fits and giggles, to show what's possible in only 400 lines of python, here is a game of asteroids, written by joe rumsey. yes, it runs under pyjamas-desktop too. http://pyjs.org/examples/asteroids/public/Space.html For more information, see: http://pyjs.org http://pyjs.org/FAQ.html http://pyjs.org/features.html http://groups.google.com/group/pyjamas-dev downloads: http://pypi.python.org/pypi/Pyjamas http://code.google.com/p/pyjamas http://sf.net/projects/pyjamas known major bugs: http://code.google.com/p/pyjamas/issues #391 (google chrome beta) #384 (text selection on opera 10.51) contributions and investigations by community members to fix these and other issues welcomed and encouraged. -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
Announcing Pyevolve 0.6rc1
Pyevolve is an evolutionary computation framework written in pure Python. This is the first release candidate before the 0.6 official release. See more information about this release on the official announce at (http://pyevolve.sourceforge.net/wordpress/?p=1164) or in the Documentation site at (http://pyevolve.sourceforge.net/0_6rc1/). -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
Re: NameError: how to get the name?
On Sat, Apr 24, 2010, Yingjie Lan lany...@yahoo.com wrote: On Sun, 4/25/10, Chris Rebert c...@rebertia.com wrote: On Sat, Apr 24, 2010, Yingjie Lan lany...@yahoo.com wrote: On Sat, 4/24/10, Gary Herron gher...@islandtraining.com wrote: Yingjie Lan wrote: On Sat, 4/24/10, Steven D'Aprano st...@--cybersource.com.au wrote: On Sat, 24 Apr 2010, Yingjie Lan wrote: I wanted to do something like this: while True: try: def fun(a, b=b, c=c): pass except NameError as ne: name = get_the_var_name(ne) locals()[name] = '' else: break This won't work. Writing to locals() does not actually change the local variables. Try it inside a function, and you will see it doesn't work: No it DOESN'T work, and both of you are precisely correct. Just for playing around, I substituted locals() by globals() and it worked as desired: snip Thanks for the information! BTW, why would locals() and globals() differ in this respect? The module-level (i.e. global) namespace is implemented by CPython using an actual dictionary; globals() returns a proxy to that dictionary and lets you manipulate it. In contrast, as an optimization, CPython implements local variables in functions using predetermined offsets into an array of predetermined length; the dictionary returned by locals() is dynamically constructed on-demand and does not affect the actual array used for the local variables (I suppose it could have been made to do so, but there's probably a complexity or optimization reason for why not). Thanks, that's good to know. The locals() behaves rather strangely, as can be demonstrated by the following two tests (the first one is from Steven, thanks Steve): #file: fun.py: def test(): x = 1 print (x) locals()['x'] = 2 print (x, locals()['x']) def test2(): locals()['x'] = 2 print (locals()['x']) print x test() test2() -And the output: python fun.py--- 1 (1, 1) 2 Traceback (most recent call last): File fun.py, line 21, in module test2() File fun.py, line 17, in test2 print x NameError: global name 'x' is not defined - I don't know how to make sense out of it. Any suggestions? My working theory is that attempting to modify a key in locals() corresponding to an extant variable has no effect, even on just the locals() dictionary itself, and is ignored, but adding or modifying other keys in locals() works like a normal dictionary. def test3(): x = 1 print x locals()['x'] = 2 locals()['y'] = 3 print x, locals()['x'], locals()['y'] print y $ python test3.py 1 1 1 3 Traceback (most recent call last): File Desktop/tmp.py, line 22, in module test3() File Desktop/tmp.py, line 7, in test3 print y NameError: global name 'y' is not defined As for why you get a NameError in test2() [assuming that's part of what's confusing you], there's no assignment to `x` in test2(), so Python reasons you must be referring to a global variable `x`. But there is no such global variable, hence the NameError. Cheers, Chris -- Your mail client's quoting style is a bit annoying. http://blog.rebertia.com -- http://mail.python.org/mailman/listinfo/python-list
Re: NameError: how to get the name?
--- On Sun, 4/25/10, Chris Rebert c...@rebertia.com wrote: From: Chris Rebert c...@rebertia.com Subject: Re: NameError: how to get the name? To: Yingjie Lan lany...@yahoo.com Cc: python list python-list@python.org Date: Sunday, April 25, 2010, 10:09 AM On Sat, Apr 24, 2010, Yingjie Lan lany...@yahoo.com wrote: On Sun, 4/25/10, Chris Rebert c...@rebertia.com wrote: On Sat, Apr 24, 2010, Yingjie Lan lany...@yahoo.com wrote: On Sat, 4/24/10, Gary Herron gher...@islandtraining.com wrote: Yingjie Lan wrote: On Sat, 4/24/10, Steven D'Aprano st...@--cybersource.com.au wrote: On Sat, 24 Apr 2010, Yingjie Lan wrote: I wanted to do something like this: while True: try: def fun(a, b=b, c=c): pass except NameError as ne: name = get_the_var_name(ne) locals()[name] = '' else: break This won't work. Writing to locals() does not actually change the local variables. Try it inside a function, and you will see it doesn't work: No it DOESN'T work, and both of you are precisely correct. Just for playing around, I substituted locals() by globals() and it worked as desired: snip Thanks for the information! BTW, why would locals() and globals() differ in this respect? The module-level (i.e. global) namespace is implemented by CPython using an actual dictionary; globals() returns a proxy to that dictionary and lets you manipulate it. In contrast, as an optimization, CPython implements local variables in functions using predetermined offsets into an array of predetermined length; the dictionary returned by locals() is dynamically constructed on-demand and does not affect the actual array used for the local variables (I suppose it could have been made to do so, but there's probably a complexity or optimization reason for why not). Thanks, that's good to know. The locals() behaves rather strangely, as can be demonstrated by the following two tests (the first one is from Steven, thanks Steve): #file: fun.py: def test(): x = 1 print (x) locals()['x'] = 2 print (x, locals()['x']) def test2(): locals()['x'] = 2 print (locals()['x']) print x test() test2() -And the output: python fun.py--- 1 (1, 1) 2 Traceback (most recent call last): File fun.py, line 21, in module test2() File fun.py, line 17, in test2 print x NameError: global name 'x' is not defined - I don't know how to make sense out of it. Any suggestions? My working theory is that attempting to modify a key in locals() corresponding to an extant variable has no effect, even on just the locals() dictionary itself, and is ignored, but adding or modifying other keys in locals() works like a normal dictionary. def test3(): x = 1 print x locals()['x'] = 2 locals()['y'] = 3 print x, locals()['x'], locals()['y'] print y $ python test3.py 1 1 1 3 Traceback (most recent call last): File Desktop/tmp.py, line 22, in module test3() File Desktop/tmp.py, line 7, in test3 print y NameError: global name 'y' is not defined As for why you get a NameError in test2() [assuming that's part of what's confusing you], there's no assignment to `x` in test2(), so Python reasons you must be referring to a global variable `x`. But there is no such global variable, hence the NameError. Cheers, Chris -- Thanks, very nice observations. What's puzzling me is this: in the first test, it seems locals() ignores assignment, thus locals()['x'] == x holds True, but in the second one, as 'x' does not exists, it allows assignment. I might assume this: locals() keeps two mappings: one is the true locals, another is an ordinary dict (let's called the faked one). when you look up a value, it first looks into the true locals, then the faked one only if not found there. As for setting a value, it always works on the faked one. That's my best guess, anyway. It seems better to be explicit: simply throws an exception whenever one tries to set a value for locals()['x'] -- just say that locals() are unlike globals(), it is read only. Yingjie -- http://mail.python.org/mailman/listinfo/python-list
Re: how to debug python application crashed occasionally
could anyone help me? On Apr 21, 2:55 pm, jacky wang bugking.w...@gmail.com wrote: Hello recently, I met a problem with one python application running with python2.5 | debian/lenny adm64 system: it crashed occasionally in our production environment. The problem started to happen just after we upgraded the python application from python2.4 | debian/etch amd64. after configuring the system to enable core dump debugging with the core dumps by following the guide line fromhttp://wiki.python.org/moin/DebuggingWithGdb, I became more confused about that. The first crash case was happening in calling python-xml module, which is claimed as a pure python module, and it's not supposed to crash python interpreter. because the python application is relatively a big one, I can not show u guys the exact source code related with the crash, but only the piece of python modules. GDB shows it's crashed at string join operation: #0 string_join (self=0x7f7075baf030, orig=value optimized out) at ../Objects/stringobject.c:1795 1795 ../Objects/stringobject.c: No such file or directory. in ../Objects/stringobject.c and pystack macro shows the details: gdb) pystack /usr/lib/python2.5/StringIO.py (271): getvalue /usr/lib/python2.5/site-packages/_xmlplus/dom/minidom.py (62): toprettyxml /usr/lib/python2.5/site-packages/_xmlplus/dom/minidom.py (47): toxml at that time, we also found python-xml module has performance issue for our application, so we decided to use python-lxml to replace python-xml. After that replacement, the crash was gone. That's a bit weird for me, but anyway, it's gone. Unfortunately, another two 'kinds' of crashes happening after that, and the core dumps show they are not related with the replacement. One is crashed with Program terminated with signal 11, and the pystack macro shows it's crashed at calling the built-in id() function. #0 visit_decref (op=0x20200a3e22726574, data=0x0) at ../Modules/ gcmodule.c:270 270 ../Modules/gcmodule.c: No such file or directory. in ../Modules/gcmodule.c Another is crashed with Program terminated with signal 7, and the pystack macro shows it's crashed at the exactly same operation (string join) as the first one (python-xml), but in different library python- simplejson: #0 string_join (self=0x7f5149877030, orig=value optimized out) at ../Objects/stringobject.c:1795 1795 ../Objects/stringobject.c: No such file or directory. in ../Objects/stringobject.c (gdb) pystack /var/lib/python-support/python2.5/simplejson/encoder.py (367): encode /var/lib/python-support/python2.5/simplejson/__init__.py (243): dumps I'm not good at using gdb C programming, then I tried some other ways to dig further: * get the source code of python2.5, but can not figure out the crash reason :( * since Debian distribution provides python-dbg package, and I tried to use python2.5-dbg interpreter, but not the python2.5, so that I can get more debug information in the core dump file. Unfortunately, my python application is using a bunch of C modules, and not all of them provides -dbg package in Debian/Lenny. So it still doesn't make any progress yet. I will be really appreciated if somebody can help me about how to debug the python crashes. Thanks in advance! BR Jacky Wang -- http://mail.python.org/mailman/listinfo/python-list
Re: Deleting more than one element from a list
On Apr 21, 12:56 pm, candide cand...@free.invalid wrote: Is the del instruction able to remove _at the same_ time more than one element from a list ? For instance, this seems to be correct : z=[45,12,96,33,66,'c',20,99] del z[2], z[6],z[0] z [12, 33, 66, 'c', 20] However, the following doesn't work : z=[45,12,96,33,66,'c',20,99] del z[2], z[3],z[6] Traceback (most recent call last): File stdin, line 1, in module IndexError: list assignment index out of range Does it mean the instruction del z[2], z[3],z[6] to be equivalent to the successive calls del z[2] del z[3] del z[6] ? Looks like you got a lot of good answers to the question as asked. FWIW, successive delete operations on a list are dog slow. It is better to delete all of the entries in one pass. There are several ways to do it. Here's one: z=[45,12,96,33,66,'c',20,99] targets = [2, 3, 6] PLACEHOLDER = object() for i in targets: ... z[i] = PLACEHOLDER z[:] = [elem for elem in z if elem is not PLACEHOLDER] Here's another: z=[45,12,96,33,66,'c',20,99] targets = set([2, 3, 6]) z[:] = [elem for i, elem in enumerate(z) if i not in targets] Besides being scaleable, these two examples have some nice learning points. Hopefully, you will find them useful. Raymond -- http://mail.python.org/mailman/listinfo/python-list
Re: [Python3] Reading a binary file and wrtiting the bytes verbatim?in an utf-8 file
Another possibility is to open the file in binary mode and do the encoding yourself when writing text. This might actually be a better solution, since I'm not sure RTF uses utf-8 by default. Yes, thanks for this suggestion, it seems the best to me. Actually RTF is not UTF-8 encoded, it's 8-bit and maybe even ASCII only. Every unicode char has to be encoded as an escape sequence (\u2022 for example). Thanks again. -- Fabrice DELENTE -- http://mail.python.org/mailman/listinfo/python-list
exceptions from daemon threads which access the global namespace at interpreter shutdown (how to squelch output?)
I've got an application which makes fairly heavy use of daemon threads to perform 'background' processing and various other long-running tasks that are likely to block. I originally thought I could safely fire off a daemon threading.Thread and essentially forget about managing the thread's lifecycle. My thinking was that from the main thread's perspective its safe to fire off a daemon thread to do background twiddling and let the threading machinery manage the thread's lifespan assuming that: 1. the 'background twiddling' is threadsafe and 2. the thread can safely 'die' at any point without requiring a shutdown procedure Some coding later and I learn this isn't exactly the case, as there as in an additional requirement to correctly use 'daemon' threads -- they can't reference anything in the global namespace else they may raise exceptions at interpreter shutdown. As part of the shutdown procedure, the interpreter sets all global variables to None, a daemon thread may run while this is occuring/after it occured and raise an exception. The exception may get printed if the interpreter catches/prints it before the process exits. I garnered this understanding from this problem description -- (although all mistakes in description are my own) http://bugs.python.org/issue1722344 In this bug report they discuss an interpreter problem which affects non-daemon threads -- I'm not attempting to claim that I'm being affected by an interpreter bug, I reference this link only because it contains good descriptions of the interpreter shutdown process as well as the additional requirements the interpreter shutdown process places on 'daemon' threads When Python begins to shutdown it takes each module and sets each variable in the global namespace to None. If a thread has not terminated before the interpreter terminates then the thread tries to use a global variable which has been set to None. This is not about to change since this occurs because of coding errors. You must make sure that either your thread is as safe as a __del__ method (which means no global namespace access) or you can't let the app exit until you are positive all of your threads have terminated, not just asked them to shutdown since this is all asynchronous. which means no global namespace access Does that mean that you cannot use len and range in a Thread? No, it means you have to be careful if you do. Shutting down properly will take care of things. Otherwise you need to save a reference locally (either on an object or as a local variable) and use that reference instead of relying on the one defined in the global namespace. Here's an example of a variable access from a daemon thread after interpreter shutdown started setting module globals to None: Exception in thread Thread-11 (most likely raised during interpreter shutdown): (pydev-2.6) ncohen$ In this run, the process exited before even one traceback finished printing but this will be timing dependent, -- sometimes I'll see tracebacks from many backgrounds threads and sometimes just snippets like this. They will typically be AttributeError's or TypeError's resulting from failed attempts to access variables from the global namespace. Here's a longer example from another run: Traceback (most recent call last): File /Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/threading.py, line 525, in __bootstrap_inner File /Users/ncohen/software/viis/viis/apps/permassh.py, line 184, in run File /Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/SocketServer.py, line 224, in serve_forever type 'exceptions.AttributeError': 'NoneType' object has no attribute 'select' Traceback (most recent call last): File /Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/threading.py, line 525, in __bootstrap_inner File /Users/ncohen/software/viis/viis/apps/permassh.py, line 184, in run File /Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/SocketServer.py, line 224, in serve_forever type 'exceptions.AttributeError': 'NoneType' object has no attribute 'select' Exception in thread Thread-7 (most likely raised during interpreter shutdown): Traceback (most recent call last): File /Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/threading.py, line 525, in __bootstrap_inner File /Users/ncohen/pydev-2.6/lib/python2.6/site-packages/paramiko/transport.py, line 1571, in run File /Users/ncohen/pydev-2.6/lib/python2.6/site-packages/paramiko/transport.py, line 1386, in _log File /Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/logging/__init__.py, line 1105, in log type 'exceptions.AttributeError': 'NoneType' object has no attribute 'IntType' (pydev-2.6)breathe-wifi:viis.webapp ncohen$ (pydev-2.6) ncohen$ My questions concern whether or not its 'safe' to use daemon threads this way -- is the 'no
Re: Wanted: Python solution for ordering dependencies
Chris Rebert wrote: On Sat, Apr 24, 2010 at 1:53 PM, Jonathan Fine jf...@pytex.org wrote: Hi I'm hoping to avoid reinventing a wheel (or other rolling device). I've got a number of dependencies and, if possible, I want to order them so that each item has its dependencies met before it is processed. I think I could get what I want by writing and running a suitable makefile, but that seems to be such a kludge. Does anyone know of an easily available Python solution? http://pypi.python.org/pypi/topsort/0.9 http://www.bitformation.com/art/python_toposort.html Thanks Chris. Most helpful. I think I'll use that code (which will save me at least half a day, and that for a solution that wouldn't be linear time). -- Jonathan -- http://mail.python.org/mailman/listinfo/python-list
How to choose a debugger
Hi, I want to debug my c++blocks which are dynamically loaded into python for execution. I am using wingide for debugging python. But its limitation is that when c++module is called in python script it doent take me into c++ module. What I want is that I should be able to visually see the c++ code (unlike gdb) when it is called from the python script and I should be able to debug it ( step out, step into etc).And when c++ module ends it should take me back into the python module. In other words, I want to follow my program line by line. Please guide me. Thank you. Regards, Sanam _ Hotmail: Powerful Free email with security by Microsoft. https://signup.live.com/signup.aspx?id=60969-- http://mail.python.org/mailman/listinfo/python-list
(snmp code) perl to python
hi hope all are doing good, i have code written in perl which quries too many devices and then stores the result in mysqldb, whiel shifting to python and googling i heared of and studied google asynch python code, now i wanted to use it n convert my perl code to it but i have some problem. 1. this class creates forks every snmp query and returns un ordered result without any information that which oid returned which result, where as in my code i query all only if a parent oid returns true, now i dont know how to read specific oid. algo of perl code, read all the ips and communities from mysql then fork function for every router so that all the equipment are queried at once, it creates that much saperate process of equipment ips, function that is forked: loop for all the interfaces: check if the inteface is up - if so read the interface ips. - save result in mysql tables. kindly help me convert this code to python or make this logic in python. -- http://mail.python.org/mailman/listinfo/python-list
Fix bugs without breaking down existing code
Say, a Standard Library function works in a way it was not supposed to. Developers (who use Python) handle this issue themselves. And then, you (a python-core developer) fix the behavior of the function. Although you have “fixed” the bug, anyone who upgrades, will be in trouble. Their code may no longer work. How do you go about this issue? How do you fix things without breaking down existing systems? -- http://mail.python.org/mailman/listinfo/python-list
Re: csv.py sucks for Decimal
On Apr 23, 9:23 am, Phlip phlip2...@gmail.com wrote: When I use the CSV library, with QUOTE_NONNUMERIC, and when I pass in a Decimal() object, I must convert it to a string. Why must you? What unwanted effect do you observe when you don't convert it? the search for an alternate CSV module, without this bug, will indeed begin very soon! What bug? I'm pointing out that QUOTE_NONNUMERIC would work better with an option to detect numeric-as-string, and absolve it. That would allow Decimal() to do its job, unimpeded. Decimal()'s job is to create an instance of the decimal.Decimal class; how is that being impeded by anything in the csv module? -- http://mail.python.org/mailman/listinfo/python-list
Re: Wanted: Python solution for ordering dependencies
Aahz wrote: In article u_idnaxonvb9x07wnz2dnuvz8kmdn...@brightview.co.uk, Jonathan Fine jf...@pytex.org wrote: I'm hoping to avoid reinventing a wheel (or other rolling device). I've got a number of dependencies and, if possible, I want to order them so that each item has its dependencies met before it is processed. I think I could get what I want by writing and running a suitable makefile, but that seems to be such a kludge. scons? Thanks for the pointer. Looks interesting, but it may be a bit heavyweight for what I need. -- Jonathan -- http://mail.python.org/mailman/listinfo/python-list
ANN: Oktest-0.2.2 - a new-style testing library
Hi,
I released Oktest 0.2.2.
http://packages.python.org/Oktest/
http://pypi.python.org/pypi/Oktest/
Overview
Oktest is a new-style testing library for Python.
::
from oktest import ok
ok (x) 0 # same as assert_(x 0)
ok (s) == 'foo'# same as assertEqual(s, 'foo')
ok (s) != 'foo'# same as assertNotEqual(s, 'foo')
ok (f).raises(ValueError) # same as assertRaises(ValueError, f)
ok (u'foo').is_a(unicode) # same as assert_(isinstance(u'foo', unicode))
not_ok (u'foo').is_a(int) # same as assert_(not isinstance(u'foo', int))
ok ('A.txt').is_file() # same as assert_(os.path.isfile('A.txt'))
not_ok ('A.txt').is_dir() # same as assert_(not os.path.isdir('A.txt'))
You can use ok() instead of 'assertXxx()' in unittest.
Oktest requires Python 2.3 or later. Oktest is ready for Python 3.
NOTICE!! Oktest is a young project and specification may change in the future.
See http://packages.python.org/Oktest/ for details.
Changes
---
* Enhanced to set 'f.exception' after 'ok (f).raises(Exception)'
to get raised exception object. For example::
def f():
int('foobar')
ok (f).raises(ValueError)
ok (f.exception.message) == invalid literal for int() with base
10: 'foobar'
* Changed to flush output after '.'/'f'/'E' printed
* Change to get exception message by 'str(ex)' instead of 'ex.message'
Have fun!
--
regards,
makoto kuwata
--
http://mail.python.org/mailman/listinfo/python-list
Re: Wanted: Python solution for ordering dependencies
On Sun, Apr 25, 2010 at 5:53 AM, Jonathan Fine jf...@pytex.org wrote:
I'm hoping to avoid reinventing a wheel (or other rolling device). I've got
a number of dependencies and, if possible, I want to order them so that each
item has its dependencies met before it is processed.
I think I could get what I want by writing and running a suitable makefile,
but that seems to be such a kludge.
Does anyone know of an easily available Python solution?
If you are looking for alternatives of Make or Ant, try pyKook.
pyKook is a pure-Python tool similar to Make, Ant, or Rake.
http://www.kuwata-lab.com/kook/pykook-users-guide.html
http://pypi.python.org/pypi/Kook/
example (Kookbook.py):
CC = prop('CC', 'gcc')
CFLAGS = prop('CFLAGS', '-g -O2')
@recipe
@ingreds('hello.o')
def task_all(c):
compile all *.o# recipe description
pass
@recipe
@product(*.o)
@ingreds($(1).c, if_exists($(1).h))
def file_o(c):
compile '*.c' and '*.h' into '*.o' # recipe description
system(c%$(CC) $(CFLAGS) -c $(ingred))
example of command-line:
~/tmp kk all
### ** hello.o (recipe=file_o)
$ gcc -g -O2 -c hello.c
### * all (recipe=task_all)
--
regards,
makoto kuwata
--
http://mail.python.org/mailman/listinfo/python-list
[ANN] pyjamas 0.7 released
pyjamas - the stand-alone python-to-javascript compiler, and separate GUI Widget Toolkit, has its 0.7 release, today. this has been much delayed, in order to allow the community plenty of time between the 0.7pre2 release and the final release, to review and test all the examples. pyjamas allows developers to create applications that will run either in any modern web browser (with no plugins required) or as a stand-alone cross-platform desktop application (like PyQT4 or PyGTK2), WITHOUT requiring modifications to the original python source. this concept is singularly unique in the free software python world, but is conceptually similar to Adobe AIR and Silverlight - without the massive plugins required. there has been significant improvements, features and libraries added in between 0.6 and 0.7: please see the README in the distribution for details. for fits and giggles, to show what's possible in only 400 lines of python, here is a game of asteroids, written by joe rumsey. yes, it runs under pyjamas-desktop too. http://pyjs.org/examples/asteroids/public/Space.html For more information, see: http://pyjs.org http://pyjs.org/FAQ.html http://pyjs.org/features.html http://groups.google.com/group/pyjamas-dev downloads: http://pypi.python.org/pypi/Pyjamas http://code.google.com/p/pyjamas http://sf.net/projects/pyjamas known major bugs: http://code.google.com/p/pyjamas/issues #391 (google chrome beta) #384 (text selection on opera 10.51) contributions and investigations by community members to fix these and other issues welcomed and encouraged. -- http://mail.python.org/mailman/listinfo/python-list
Re: Fix bugs without breaking down existing code
On 10:02 am, elvismoodbi...@gmail.com wrote: Say, a Standard Library function works in a way it was not supposed to. Developers (who use Python) handle this issue themselves. And then, you (a python-core developer) fix the behavior of the function. Although you have 1Cfixed 1D the bug, anyone who upgrades, will be in trouble. Their code may no longer work. How do you go about this issue? How do you fix things without breaking down existing systems? CPython itself has no policy about such things. Each case is handled independently by whomever is working on it. http://twistedmatrix.com/trac/wiki/CompatibilityPolicy might be interesting, though. The general idea there (and I'm not sure how well it's actually expressed there) is that if you want new behavior, then (with a few exceptions) you add a new API: you don't change an existing API. Jean-Paul -- http://mail.python.org/mailman/listinfo/python-list
Re: Wanted: Python solution for ordering dependencies
On Sun, Apr 25, 2010 at 4:53 AM, Jonathan Fine jf...@pytex.org wrote: Hi I'm hoping to avoid reinventing a wheel (or other rolling device). I've got a number of dependencies and, if possible, I want to order them so that each item has its dependencies met before it is processed. I think I could get what I want by writing and running a suitable makefile, but that seems to be such a kludge. Does anyone know of an easily available Python solution? http://pypi.python.org/pypi/doit -- http://mail.python.org/mailman/listinfo/python-list
Need help with basic DOM XML tree traversing
Hi,
This is my first try at XML with Python, and though I tried to read on the web,
I'm unable to traverse a DOM tree, as my top element seems to be DOCUMENT_NODE
and I cannot find a way to get to the nodes below it.
Below is a sample data, script and execution.
Could you point to where I'm doing wrong ?
Thanks,
Ron.
$ python -u xml_parse.py
node: xml.dom.minidom.DocumentType instance at 0x00DE25A8
dom2.nodeType: 9
dom2.nodeName: #document
node is DOCUMENT_NODE: xml.dom.minidom.DocumentType instance at 0x00DE25A8
node: DOM Element: database at 0xde2698
dom2.nodeType: 9
dom2.nodeName: #document
node is DOCUMENT_NODE: DOM Element: database at 0xde2698
('dom2._get_childNodes():', [xml.dom.minidom.DocumentType instance at
0x00DE25A8, DOM Element: database at 0xde2698])
Traceback (most recent call last):
File xml_parse.py, line 26, in module
print(child_nodes._get_childNodes():,child_nodes._get_childNodes())
AttributeError: 'NodeList' object has no attribute '_get_childNodes'
$ cat xml_parse.py
#!/usr/bin/env python
from xml.dom.minidom import parse, parseString
xml_file_path ='example.xml'
in_xml = open(xml_file_path)
tmp = in_xml.read()
doctype_loc = tmp.rfind(!DOCTYPE)
open_squere_par_loc = tmp.find([,doctype_loc)
first_part = tmp[:open_squere_par_loc + 1]
close_squere_par_loc = tmp.find(],doctype_loc)
last_part = tmp[close_squere_par_loc:]
xml_string = %s%s % (first_part, last_part)
dom2 = parseString(xml_string)
for node in dom2.childNodes:
print node:,node
print dom2.nodeType:,dom2.nodeType
print dom2.nodeName:,dom2.nodeName
if dom2.nodeType == dom2.ELEMENT_NODE:
print node is ELEMENT_NODE:,node
elif dom2.nodeType == dom2.DOCUMENT_NODE:
print node is DOCUMENT_NODE:,node
child_nodes = dom2._get_childNodes()
print(dom2._get_childNodes():,dom2._get_childNodes())
print(child_nodes._get_childNodes():,child_nodes._get_childNodes())
dom2.unlink()
$ cat example.xml
?xml version=1.0 encoding=UTF-8?
!DOCTYPE database [
!ELEMENT database (DbPortCharacteristic*, DbDpmPersonality*, DbHostMode*,
DbGlobalSettings*, DbSimulatedDisk*, DbUserPermission*, DbUser*,
DbUserSession*, DbUserGroup*, DbLicenseKey*, DbObjectBase*,
DbFolderQueryMetadata*, DbFolder*, DbVDevAccessPermissions*,
DbApplicationType*, DbPReserve*, DbVDevAgentBroadcastMsg*, DbVDev*,
DbConsistencyGroup*, DbVolume*, DbPit*, DbView*, DbStripeSegment*, DbPool*,
DbStripe*, DbScsiAddress*, DbDisk*, DbHbaAccessPath*, DbHba*,
DbSubnodeGroupInfo*, DbSubnodeGroup*, DbHbaGroup*, DbPrRequest*, DbDomain*,
DbSvmInfo*, DbPermTemplate*, DbPersonality*, DbMessageGroup*, DbJobBase*,
DbMmJob*, DbMmRJob*, DbMcJob*, DbMcRJob*, DbGroupBase*, DbMmGroup*,
DbMmRGroup*, DbMcGroup*, DbMcRGroup*, DbLoadBalanceNode*, DbBrokenMmJobInfo*,
DbSmGroup*, DbSmJob*, DbDestVolInfo*, DbJobDestPermission*, DbVSSSnapshotSet*,
DbVSSSnapshot*, DbPoolAlertData*)
!ELEMENT DbPortCharacteristic (m_id, m_PortAddress, m_PortNumber, m_MtuActive,
m_MtuSupported, m_SpeedCurrent, m_SpeedMax, m_ScsiRoleInfo, m_FCPortTypeInfo,
m_InterfaceProtocolType, m_PortStatus, m_HbaGroup)
!ELEMENT m_id (#PCDATA)
]
database
DbPortCharacteristic id=9429
m_id2/m_id
m_PortAddress5001438102cfba20/m_PortAddress
m_PortNumber0/m_PortNumber
m_MtuActive2048/m_MtuActive
m_MtuSupported2048/m_MtuSupported
m_SpeedCurrent0/m_SpeedCurrent
m_SpeedMax4/m_SpeedMax
m_ScsiRoleInfo1/m_ScsiRoleInfo
m_FCPortTypeInfo1/m_FCPortTypeInfo
m_InterfaceProtocolType3/m_InterfaceProtocolType
m_PortStatus0/m_PortStatus
m_HbaGroupref id=8967//m_HbaGroup
/DbPortCharacteristic
/database
$ python -V
Python 2.6.4
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Re: Need help with basic DOM XML tree traversing
Barak, Ron, 25.04.2010 17:06:
This is my first try at XML with Python, and though I tried to read on the web,
I'm unable to traverse a DOM tree, as my top element seems to be DOCUMENT_NODE
and I cannot find a way to get to the nodes below it.
You might find the xml.etree.ElementTree package a lot easier to work with.
$ python -u xml_parse.py
node:xml.dom.minidom.DocumentType instance at 0x00DE25A8
dom2.nodeType: 9
dom2.nodeName: #document
node is DOCUMENT_NODE:xml.dom.minidom.DocumentType instance at 0x00DE25A8
node:DOM Element: database at 0xde2698
dom2.nodeType: 9
dom2.nodeName: #document
node is DOCUMENT_NODE:DOM Element: database at 0xde2698
('dom2._get_childNodes():', [xml.dom.minidom.DocumentType instance at
0x00DE25A8,DOM Element: database at 0xde2698])
Traceback (most recent call last):
File xml_parse.py, line 26, inmodule
print(child_nodes._get_childNodes():,child_nodes._get_childNodes())
AttributeError: 'NodeList' object has no attribute '_get_childNodes'
childNodes is a property, use it like
print(child_nodes.childNodes:, child_nodes.childNodes)
By convention, the underscore at the beginning of _get_childNodes
indicates that it is not considered a public method.
Stefan
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Re: Wanted: Python solution for ordering dependencies
Makoto Kuwata wrote: On Sun, Apr 25, 2010 at 5:53 AM, Jonathan Fine jf...@pytex.org wrote: I'm hoping to avoid reinventing a wheel (or other rolling device). I've got a number of dependencies and, if possible, I want to order them so that each item has its dependencies met before it is processed. I think I could get what I want by writing and running a suitable makefile, but that seems to be such a kludge. Does anyone know of an easily available Python solution? If you are looking for alternatives of Make or Ant, try pyKook. pyKook is a pure-Python tool similar to Make, Ant, or Rake. http://www.kuwata-lab.com/kook/pykook-users-guide.html http://pypi.python.org/pypi/Kook/ Thank you for this, Makoto. However, all I require is a means of ordering the items that respects the dependencies. This rest I can, and pretty much have to, manage myself. So probably something more lightweight would suit me. -- Jonathan -- http://mail.python.org/mailman/listinfo/python-list
Re: Wanted: Python solution for ordering dependencies
Eduardo Schettino wrote: On Sun, Apr 25, 2010 at 4:53 AM, Jonathan Fine jf...@pytex.org wrote: Hi I'm hoping to avoid reinventing a wheel (or other rolling device). I've got a number of dependencies and, if possible, I want to order them so that each item has its dependencies met before it is processed. I think I could get what I want by writing and running a suitable makefile, but that seems to be such a kludge. Does anyone know of an easily available Python solution? http://pypi.python.org/pypi/doit Thank you for this, Eduardo. However, all I require is a means of ordering the items that respects the dependencies. This rest I can, and pretty much have to, manage myself. So probably something more lightweight would suit me. -- Jonathan -- http://mail.python.org/mailman/listinfo/python-list
Re: ANN: Oktest-0.2.2 - a new-style testing library
Makoto Kuwata wrote:
Hi,
I released Oktest 0.2.2.
http://packages.python.org/Oktest/
http://pypi.python.org/pypi/Oktest/
Overview
Oktest is a new-style testing library for Python.
::
from oktest import ok
ok (x) 0 # same as assert_(x 0)
ok (s) == 'foo'# same as assertEqual(s, 'foo')
ok (s) != 'foo'# same as assertNotEqual(s, 'foo')
ok (f).raises(ValueError) # same as assertRaises(ValueError, f)
ok (u'foo').is_a(unicode) # same as assert_(isinstance(u'foo', unicode))
not_ok (u'foo').is_a(int) # same as assert_(not isinstance(u'foo', int))
ok ('A.txt').is_file() # same as assert_(os.path.isfile('A.txt'))
not_ok ('A.txt').is_dir() # same as assert_(not os.path.isdir('A.txt'))
You can use ok() instead of 'assertXxx()' in unittest.
Oktest requires Python 2.3 or later. Oktest is ready for Python 3.
NOTICE!! Oktest is a young project and specification may change in the future.
See http://packages.python.org/Oktest/ for details.
This reminds me a bit of my own in-progress work
http://bitbucket.org/jfine/python-testutil/
Here's an example of how it works:
def plus(a, b): return a + b
def minus(a, b): return a - b
def square(a): return a * a
x = TestScript(
... plus,
... (
... f(2, 2) == 5,
... )
... )
x.run()
[WrongValue(5, 4)]
y = TestScript(
... dict(f=plus, g=square, h=map),
... (
... f(2, 2) == 5,
... h(g, (1, 2, 3)) == [1, 3, 6],
... )
... )
y.run()
[WrongValue(5, 4), WrongValue([1, 3, 6], [1, 4, 9])]
But it's not yet ready for use.
--
Jonathan
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Re: Wanted: Python solution for ordering dependencies
On Sun, Apr 25, 2010 at 11:44 PM, Jonathan Fine jf...@pytex.org wrote:
Eduardo Schettino wrote:
On Sun, Apr 25, 2010 at 4:53 AM, Jonathan Fine jf...@pytex.org wrote:
Hi
I'm hoping to avoid reinventing a wheel (or other rolling device). I've
got
a number of dependencies and, if possible, I want to order them so that
each
item has its dependencies met before it is processed.
I think I could get what I want by writing and running a suitable
makefile,
but that seems to be such a kludge.
Does anyone know of an easily available Python solution?
http://pypi.python.org/pypi/doit
Thank you for this, Eduardo. However, all I require is a means of ordering
the items that respects the dependencies. This rest I can, and pretty much
have to, manage myself.
So probably something more lightweight would suit me.
you just want a function?
def order_tasks(tasks):
ADDING, ADDED = 0, 1
status = {} # key task-name, value: ADDING, ADDED
task_order = []
def add_task(task_name):
if task_name in status:
# check task was alaready added
if status[task_name] == ADDED:
return
# detect cyclic/recursive dependencies
if status[task_name] == ADDING:
msg = Cyclic/recursive dependencies for task %s
raise Exception(msg % task_name)
status[task_name] = ADDING
# add dependencies first
for dependency in tasks[task_name]:
add_task(dependency)
# add itself
task_order.append(task_name)
status[task_name] = ADDED
for name in tasks.keys():
add_task(name)
return task_order
if __name__ == '__main__':
task_list = {'a':['b','c'],
'b':['c'],
'c':[]}
print order_tasks(task_list)
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Re: Wanted: Python solution for ordering dependencies
Eduardo Schettino wrote:
On Sun, Apr 25, 2010 at 11:44 PM, Jonathan Fine jf...@pytex.org wrote:
Eduardo Schettino wrote:
On Sun, Apr 25, 2010 at 4:53 AM, Jonathan Fine jf...@pytex.org wrote:
Hi
I'm hoping to avoid reinventing a wheel (or other rolling device). I've
got
a number of dependencies and, if possible, I want to order them so that
each
item has its dependencies met before it is processed.
I think I could get what I want by writing and running a suitable
makefile,
but that seems to be such a kludge.
Does anyone know of an easily available Python solution?
http://pypi.python.org/pypi/doit
Thank you for this, Eduardo. However, all I require is a means of ordering
the items that respects the dependencies. This rest I can, and pretty much
have to, manage myself.
So probably something more lightweight would suit me.
you just want a function?
def order_tasks(tasks):
ADDING, ADDED = 0, 1
status = {} # key task-name, value: ADDING, ADDED
task_order = []
def add_task(task_name):
if task_name in status:
# check task was alaready added
if status[task_name] == ADDED:
return
# detect cyclic/recursive dependencies
if status[task_name] == ADDING:
msg = Cyclic/recursive dependencies for task %s
raise Exception(msg % task_name)
status[task_name] = ADDING
# add dependencies first
for dependency in tasks[task_name]:
add_task(dependency)
# add itself
task_order.append(task_name)
status[task_name] = ADDED
for name in tasks.keys():
add_task(name)
return task_order
if __name__ == '__main__':
task_list = {'a':['b','c'],
'b':['c'],
'c':[]}
print order_tasks(task_list)
Yes, this is good, and pretty much what I'd have written if I had to do
it myself. Thank you, Eduardo.
But the links posted by Chris Rebert suggest that this solution can be
quadratic in its running time, and give a Python implementation of
Tarjan's linear solution. Here are the links:
http://pypi.python.org/pypi/topsort/0.9
http://www.bitformation.com/art/python_toposort.html
I don't know if the quadratic running time is an issue for my purpose.
--
Jonathan
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Re: Wanted: Python solution for ordering dependencies
On 04/26/10 02:37, Jonathan Fine wrote: I don't know if the quadratic running time is an issue for my purpose. It's not until you decide it's yes. -- http://mail.python.org/mailman/listinfo/python-list
Re: (snmp code) perl to python
On Apr 25, 9:41 am, Shabbir Ahmed shabbir1...@gmail.com wrote: hi hope all are doing good, i have code written in perl which quries too many devices and then stores the result in mysqldb, whiel shifting to python and googling i heared of and studied google asynch python code, now i wanted to use it n convert my perl code to it but i have some problem. 1. this class creates forks every snmp query and returns un ordered result without any information that which oid returned which result, where as in my code i query all only if a parent oid returns true, now i dont know how to read specific oid. algo of perl code, read all the ips and communities from mysql then fork function for every router so that all the equipment are queried at once, it creates that much saperate process of equipment ips, function that is forked: loop for all the interfaces: check if the inteface is up - if so read the interface ips. - save result in mysql tables. kindly help me convert this code to python or make this logic in python. if the code is particularly long (greater than 2,000 lines) then you might wish to look at java2py.py and use it as the basis to write a dumb assistant in doing much of the code-conversion: http://pyjamas.svn.sourceforge.net/viewvc/pyjamas/trunk/contrib/java2py.py?revision=1572content-type=text%2Fplain this program is _not_ parser-based (yacc, ply, oMeta2) it is line- based and state-based. specific assumptions are made about the code layout (braces in KR formatting style for example) and, thanks to the high code-quality of the code it was used to translate (GWT) this was not in the slightest bit a problem. so, _in combination with a code-cleaner_ such as indent, which regularises the formatting of whatever god-awful-looking perl you want to translate, the approach indicated by java2py.py will save you a lot of time and mistakes. think about it, even if the code you want to translate is 500 lines. that's 500+ lines you need to rewrite, whereas something as simple as 267 lines of python could help automate that process of conversion. l. -- http://mail.python.org/mailman/listinfo/python-list
Re: Interacting With Another Script
On Mar 11, 2:16 am, alex23 wuwe...@gmail.com wrote: Victor Subervi victorsube...@gmail.com wrote: There's a program (vpopmail) that has commands which, when called, request input (email address, password, etc.) from the command line. I would like to build a TTW interface for my clients to use that interacts with these commands. The Pexpect[1] module is pretty much aimed at doing exactly this. 1:http://www.noah.org/wiki/Pexpect i also made some patches to telnetlib.py back in 2000, creating an expectlib.py and then using that in telnetlib.py. the code is still in python's bug tracker, and no fucker has integrated it, despite it still being valid, relevant and useful, in ten years since. the code basically creates a base class from which the old telnetlib derives, but it also provides an additional class TelnetPopen which, as you might expect, can be used to run python popen and then use _all_ of the functions in telnetlib which should never have been hard-coded as specifically being associated with the Telnet class (hence why i moved them to expectlib.py). it's therefore possible to use it to do ssh as if it was telnet (remember to use the -t option to stop terminal translation, and remember to use TelnetPopen because otherwise you have to patch ssh to accept passwords on the command-line!) in order to avoid clashes with telnetlib.py, i often rename it to telnetlib2.py and i believe i've regularly published them in other free software projects, so you should find it with a search for telnetlib2.py. if you can't specifically find the two modules, let me know, and i'll make them available somewhere. l. -- http://mail.python.org/mailman/listinfo/python-list
Re: [ANN] pyjamas 0.7 released
for fits and giggles, to show what's possible in only 400 lines of python, here is a game of asteroids, written by joe rumsey. yes, it runs under pyjamas-desktop too. http://pyjs.org/examples/asteroids/public/Space.html This URL returns a blank page for me on firefox 3.3.5 (linux) with and without adblock plus. Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: (snmp code) perl to python
Shabbir Ahmed shabbir1...@gmail.com writes: hi hope all are doing good, i have code written in perl which quries too many devices and then stores the result in mysqldb, whiel shifting to python and googling i heared of and studied google asynch python code, now i wanted to use it n convert my perl code to it but i have some problem. So now you have two problems: a) your Perl code doesn't work as you want and b) your lack of Python coding skills. read all the ips and communities from mysql then fork function for every router so that all the equipment are queried at once, it creates that much saperate process of equipment ips, If thats a problem, why not fork a worker pool of a limited number of processes? An other options might be to use POE. kindly help me convert this code to python or make this logic in python. Like I already wrote, you have now 2 problems. -- John Bokma j3b Hacking Hiking in Mexico - http://johnbokma.com/ http://castleamber.com/ - Perl Python Development -- http://mail.python.org/mailman/listinfo/python-list
ANN: pyevolve 0.6rc1 released !
Pyevolve is an evolutionary computation framework written in pure Python. This is the first release candidate before the 0.6 official release. See more information about this release on the official announce at (http://pyevolve.sourceforge.net/wordpress/?p=1164) or in the Documentation site at (http://pyevolve.sourceforge.net/0_6rc1/). -- http://mail.python.org/mailman/listinfo/python-list
Re: [ANN] pyjamas 0.7 released
On 4/25/2010 2:07 PM, Daniel Fetchinson wrote: for fits and giggles, to show what's possible in only 400 lines of python, here is a game of asteroids, written by joe rumsey. yes, it runs under pyjamas-desktop too. http://pyjs.org/examples/asteroids/public/Space.html This URL returns a blank page for me on firefox 3.3.5 (linux) with and without adblock plus. Ditto with ff 3.6.3 on WinXP (no adblock). -- http://mail.python.org/mailman/listinfo/python-list
Re: [ANN] pyjamas 0.7 released
On 4/25/2010 3:43 PM, Terry Reedy wrote: On 4/25/2010 2:07 PM, Daniel Fetchinson wrote: for fits and giggles, to show what's possible in only 400 lines of python, here is a game of asteroids, written by joe rumsey. yes, it runs under pyjamas-desktop too. http://pyjs.org/examples/asteroids/public/Space.html This URL returns a blank page for me on firefox 3.3.5 (linux) with and without adblock plus. Ditto with ff 3.6.3 on WinXP (no adblock). and IE8 on winxp. It does read the page because it does get the page title. -- http://mail.python.org/mailman/listinfo/python-list
Threading problem
I have the following issue: My program runs a thread called the MainThread, that loops trough a number of URLs and decides when it's the right time for one to be fetched. Once a URL has to be fetched, it's added to a Queue object, where the FetchingThread picks up and does the actual work. Often, URLs have to be fetched with frequencies of 100ms, so the objects will get added to the queue repeatedly. Even though it takes more than 100ms to get the URL and process it, ideally what would happen is: ms0: Request 1 is sent ms100: request 2 is sent ms150: request 1 is processed ms200: request 3 is sent ms250: request 2 is processed and so on... The problem is that for some reason python runs the main thread considerably more than the checking thread. If I ask them both to 'print' when run, this becomes obvious ; even if I create more check threads than main threads (I even tried 50 check threads and 1 main thread). Despite my terminology, both the mainthread and fetchthread are created in exactly the same way. what part of threading in python am I not properly understanding? thanks! -- http://mail.python.org/mailman/listinfo/python-list
Re: [ANN] pyjamas 0.7 released
* Luke Kenneth Casson Leighton: http://pyjs.org/examples/asteroids/public/Space.html result An error has been encountered in accessing this page. 1. Server: pyjs.org 2. URL path: /examples/asteroids/public/examples/asteroids/public/bootstrap.js 3. Error notes: NONE 4. Error type: 404 5. Request method: GET 6. Request query string: NONE 7. Time: 2010-04-25 19:55:16 UTC (1272225316) Reporting this problem: The problem you have encountered is with a project web site hosted by SourceForge.net. This issue should be reported to the SourceForge.net-hosted project (not to SourceForge.net). If this is a severe or recurring/persistent problem, please do one of the following, and provide the error text (numbered 1 through 7, above): 1. Contact the project via their designated support resources. 2. Contact the project administrators of this project via email (see the upper right-hand corner of the Project Summary page for their usernames) at user-n...@users.sourceforge.net If you are a maintainer of this web content, please refer to the Site Documentation regarding web services for further assistance. NOTE: As of 2008-10-23 directory index display has been disabled by default. This option may be re-enabled by the project by placing a file with the name .htaccess with this line: Options +Indexes /result Cheers hth., - Alf -- http://mail.python.org/mailman/listinfo/python-list
Confusing SyntaxError while entering non-indented code in interactive interpreter on continuation line.
[I originally sent this to python-help; the volunteer who responded thought it was OK to repost it here.] I'm sure this has been discussed somewhere before, but I can't find it in the Python issue tracker. The following behavior from the interactive interpreter is rather confusing. (I've seen this behavior both under Python 2.6.5 on 32-bit Windows XP, installed from the standard Windows binary installer available from python.org, and under Python 2.4.3 on a Fedora Core 4 32-bit x86 Linux system.) The following do-nothing code is valid Python: if True: pass pass A script file containing it will execute without error when passed to the Python interpreter from the command line, or when run from an IDLE edit window using the Run Module command (F5) key. However, if the interpreter is run in interactive mode from the command line, and I attempt to enter the same code from the interactive prompt as follows, I get a SyntaxError at the outer pass statement: if True: ... pass ... pass File stdin, line 3 pass ^ SyntaxError: invalid syntax The inner pass statement can be indented using spaces or with the Tab key; it doesn't matter. The problem is that I entered the outer pass statement on the second continuation line, rather than simply hitting return and waiting for a new primary prompt. But since the second continuation line is not indented unless you enter the indentation yourself, this is actually an easy mistake to make. One might think the parser will recognize that the inner block's indentation has been removed on the new line and that the line therefore represents a new statement. The same thing can happen in IDLE, except that IDLE automatically indents the continuation line and doesn't print a secondary prompt. But if you delete IDLE's indentation on the next continuation line and enter a new statement, you get the same SyntaxError as described above. What led me to this behavior? Example 6.1 on the following page from Dive Into Python: http://diveintopython.org/file_handling/index.html In this case, the code is a try-except statement, followed by a print. Note that the print is entered on a continuation line, which led me to carelessly try the same thing and then puzzle about it for quite a while before it finally hit me what I had been doing. I know that Dive Into Python is quite old and there have been many improvements in the language since, but I still think this gotcha needs to be looked at, at least to add a warning about it in the FAQ or tutorial, or to make the nature of the syntax error more obvious. -- http://mail.python.org/mailman/listinfo/python-list
Re: pyjamas 0.7 released
On Apr 25, 8:49 am, Luke Kenneth Casson Leighton l...@lkcl.net wrote: pyjamas - the stand-alone python-to-javascript compiler, and separate GUI Widget Toolkit, has its 0.7 release, today. this has been much delayed, in order to allow the community plenty of time between the 0.7pre2 release and the final release, to review and test all the examples. I know I'm a Luddite, but what I'd really love to see to go with this is an easy way for the application, the browser, and the user to all agree that this particular application can read and write arbitrary files in a particular local directory. A Python program you don't have to install, that executes really fast on one of the newer JavaScript JIT engines, with its own purely local data in files in a simple text format in a directory specified by the user, instead of being all tangled up in a database with data from a lot of different applications and buried deep in some multi-gigabyte browser cache directory -- now that would be a platform worth targeting. -- http://mail.python.org/mailman/listinfo/python-list
Re: Confusing SyntaxError while entering non-indented code in interactive interpreter on continuation line.
On Apr 25, 3:31 pm, Colin Howell colin.d.how...@gmail.com wrote: [I originally sent this to python-help; the volunteer who responded thought it was OK to repost it here.] I'm sure this has been discussed somewhere before, but I can't find it in the Python issue tracker. The following behavior from the interactive interpreter is rather confusing. (I've seen this behavior both under Python 2.6.5 on 32-bit Windows XP, installed from the standard Windows binary installer available from python.org, and under Python 2.4.3 on a Fedora Core 4 32-bit x86 Linux system.) The following do-nothing code is valid Python: if True: pass pass A script file containing it will execute without error when passed to the Python interpreter from the command line, or when run from an IDLE edit window using the Run Module command (F5) key. However, if the interpreter is run in interactive mode from the command line, and I attempt to enter the same code from the interactive prompt as follows, I get a SyntaxError at the outer pass statement: if True: ... pass ... pass File stdin, line 3 pass ^ SyntaxError: invalid syntax The inner pass statement can be indented using spaces or with the Tab key; it doesn't matter. The problem is that I entered the outer pass statement on the second continuation line, rather than simply hitting return and waiting for a new primary prompt. But since the second continuation line is not indented unless you enter the indentation yourself, this is actually an easy mistake to make. One might think the parser will recognize that the inner block's indentation has been removed on the new line and that the line therefore represents a new statement. The same thing can happen in IDLE, except that IDLE automatically indents the continuation line and doesn't print a secondary prompt. But if you delete IDLE's indentation on the next continuation line and enter a new statement, you get the same SyntaxError as described above. What led me to this behavior? Example 6.1 on the following page from Dive Into Python: http://diveintopython.org/file_handling/index.html In this case, the code is a try-except statement, followed by a print. Note that the print is entered on a continuation line, which led me to carelessly try the same thing and then puzzle about it for quite a while before it finally hit me what I had been doing. I know that Dive Into Python is quite old and there have been many improvements in the language since, but I still think this gotcha needs to be looked at, at least to add a warning about it in the FAQ or tutorial, or to make the nature of the syntax error more obvious. I agree that this is an easy mistake to make. It's particularly easy to do when cutting and pasting into an interactive shell. I don't think you could call this an error on the part of the python interpreter, but it seems like it would be a great feature enhancement to make the interpreter work more consistently. After all, you can happily unindent to any level except the far left: if a: ... if b: ... c ... d ... e File stdin, line 5 e ^ SyntaxError: invalid syntax Regards, Pat -- http://mail.python.org/mailman/listinfo/python-list
Re: [ANN] pyjamas 0.7 released
Daniel Fetchinson fetchin...@googlemail.com: for fits and giggles, to show what's possible in only 400 lines of python, here is a game of asteroids, written by joe rumsey. yes, it runs under pyjamas-desktop too. http://pyjs.org/examples/asteroids/public/Space.html This URL returns a blank page for me on firefox 3.3.5 (linux) with and without adblock plus. http://pyjs.org/examples/asteroids/output/Space.html works. (Firefox 3.6.3 with ABP, Chrome 4.1) -- Wir danken für die Beachtung aller Sicherheitsbestimmungen -- http://mail.python.org/mailman/listinfo/python-list
can't get python 2.5.5 to work on mac os x 10.4.11
Hi everyone, I posted this in the cocos2d and pyglet discussion group, I thought I'll get a response right away since my problem is quite general but I got no response. I hope you will help me!!! this is the original post http://groups.google.com/group/cocos-discuss/browse_thread/thread/f8bc92498dbd48af# best regards -- http://mail.python.org/mailman/listinfo/python-list
Re: Threading problem
On Apr 25, 2:55 pm, sdistefano sdistef...@gmail.com wrote: I have the following issue: My program runs a thread called the MainThread, that loops trough a number of URLs and decides when it's the right time for one to be fetched. Once a URL has to be fetched, it's added to a Queue object, where the FetchingThread picks up and does the actual work. Often, URLs have to be fetched with frequencies of 100ms, so the objects will get added to the queue repeatedly. Even though it takes more than 100ms to get the URL and process it, ideally what would happen is: ms0: Request 1 is sent ms100: request 2 is sent ms150: request 1 is processed ms200: request 3 is sent ms250: request 2 is processed and so on... The problem is that for some reason python runs the main thread considerably more than the checking thread. If I ask them both to 'print' when run, this becomes obvious ; even if I create more check threads than main threads (I even tried 50 check threads and 1 main thread). Despite my terminology, both the mainthread and fetchthread are created in exactly the same way. what part of threading in python am I not properly understanding? Unless I'm missing something, your description doesn't make this sound like either a python-specific problem, or a threading problem. Threads run when it's their turn and they aren't blocked, and you haven't described any code that would ever block your main thread, but your subsidiary threads will often be blocked at a socket waiting for their HTTP requests to complete. -- http://mail.python.org/mailman/listinfo/python-list
Re: Confusing SyntaxError while entering non-indented code in interactive interpreter on continuation line.
Colin Howell colin.d.how...@gmail.com writes: I know that Dive Into Python is quite old and there have been many improvements in the language since, FYI There is a Dive Into Python 3. -- John Bokma j3b Hacking Hiking in Mexico - http://johnbokma.com/ http://castleamber.com/ - Perl Python Development -- http://mail.python.org/mailman/listinfo/python-list
Setting a python application as the default app to open a file on a mac?
I have been using ulipad to edit .rst and .py files. I have currently been launching using terminal python32 ulipad.py and then opening the file I what to edit. I would like to be able to set ulipad as the defualt editor for .rst and .py files. I posted this question on superuser.com and got a solution using automator. http://superuser.com/questions/134594/set-default-open-with-app-to-a-python-program-on-a-mac I am asking the question on this list to see if there is another (better?) way. python32 is an terminal alias to the 32 bit python version on my machine. *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: Urllib2 urlopen and read - difference
In article mailman.1917.1271357827.23598.python-l...@python.org,
J. Cliff Dyer j...@sdf.lonestar.org wrote:
On Thu, 2010-04-15 at 11:25 -0700, koranthala wrote:
Suppose I am doing the following:
req = urllib2.urlopen('http://www.python.org')
data = req.read()
When is the actual data received? is it done by the first line? or
is it done only when req.read() is used?
My understanding is that when urlopen is done itself, we would have
received all the data, and req.read() just reads it from the file
descriptor.
But, when I read the source code of pylot, it mentioned the
following:
resp = opener.open(request) # this sends the HTTP request
and returns as soon as it is done connecting and sending
connect_end_time = self.default_timer()
content = resp.read()
req_end_time = self.default_timer()
Here, it seems to suggest that the data is received only after you do
resp.read(), which made me all confused.
My understanding (please correct me if I'm wrong), is that when you call
open, you send a request to the server, and get a response object back.
The server immediately begins sending data (you can't control when they
send it, once you've requested it). When you call read() on your
response object, it reads all the data it has already received, and if
that amount of data isn't sufficient to handle your read call, it blocks
until it has enough.
So your opener returns as soon as the request is sent, and read() blocks
if it doesn't have enough data to handle your request.
Close. urlopen() returns after it receives the HTTP header (that's why
you can get an HTTP exception on e.g. 404 without the read()).
--
Aahz (a...@pythoncraft.com) * http://www.pythoncraft.com/
It is easier to optimize correct code than to correct optimized code.
--Bill Harlan
--
http://mail.python.org/mailman/listinfo/python-list
Engineering numerical format PEP discussion
I am considering writing a PEP for the inclusion of an engineering format specifier, and would appreciate input from others. Background (for those who don't already know about engineering notation): Engineering notation (EN) is type of floating point representation. The idea with EN is that the powers of 10 are all multiples of 3, which correspond to the familiar Greek unit prefixes that engineers use when describing the different sizes of all sorts of real-world devices and phenomena: 1e-12 == pico 1e-9 == nano 1e-6 == micro 1e-3 == milli 1e+3 == kilo 1e+6 == mega 1e+9 == giga When people are talking about Ohms, Farads, Henries, Hz, and many others, they routinely have to normalize to EN. Fancy calculators from HP and TI routinely allow the users to go into engineering mode, but mysteriously things like C, Python, Excel, etc. don't For instance, no one talks about 4.7e-5F, as they would rather see 47e-6 (micro). Instead of 2.2e-2, engineers need to see 22.0e-3 (milli). Originally to address this issue, I wrote for myself an EFloat class that subclassed float: import math class EFloat(float): EFloat(x) - floating point number with engineering representation when printed Convert a string or a number to a floating point number, if possible. When asked to render itself for printing (via str() or print) it is normalized to engineering style notation at powers of 10 in multiples of 3 (for micro, milli, kilo, mega, giga, etc.) def __init__(self, value=0.0, prec=12): super(EFloat, self).__init__(value) self.precision = prec def _get_precision(self): return self._precision def _set_precision(self, p): self._precision = p self.format_string = %3. + (%d % self._precision) + fe% +d return precision = property(_get_precision, _set_precision, doc=The number of decimal places printed) def _exponent(self): if self == 0.0: ret = 0 else: ret = math.floor(math.log10(abs(self))) return ret def _mantissa(self): return self/math.pow(10, self._exponent()) def _asEng(self): shift = self._exponent() % 3 retval = self.format_string % (self._mantissa()*math.pow(10, shift), self._exponent() - shift) return retval def __str__(self): return self._asEng() def __repr__(self): return str(self) def __add__(self, x): return EFloat(float.__add__(self, float(x))) def __radd__(self, x): return EFloat(float.__add__(self, float(x))) def __mul__(self, x): return EFloat(float.__mul__(self, float(x))) def __rmul__(self, x): return EFloat(float.__mul__(self, float(x))) def __sub__(self, x): return EFloat(float.__sub__(self, float(x))) def __rsub__(self, x): return EFloat(float.__rsub__(self, float(x))) def __div__(self, x): return EFloat(float.__div__(self, float(x))) def __rdiv__(self, x): return EFloat(float.__rdiv__(self, float(x))) def __truediv__(self, x): return EFloat(float.__truediv__(self, float(x))) def __rtruediv__(self, x): return EFloat(float.__rtruediv__(self, float(x))) def __pow__(self, x): return EFloat(float.__pow__(self, float(x))) def __rpow__(self, x): return EFloat(float.__rpow__(self, float(x))) def __divmod__(self, x): return EFloat(float.__divmod__(self, float(x))) def __neg__(self): return EFloat(float.__neg__(self)) def __floordiv__(self, x): return EFloat(float.__floordiv__(self, float(x))) which works well for working with interactive Python. There are places on the web where I've read that people have to work their butts off trying to trick Excel or OpenOffice to do engineering notation, or there is some work-around that is purported to work if you use the right version of the spreadsheet. After many months of using my EFloat class extensively with lots of apps dealing with embedded engineering tasks, it dawns on me that what we really need is simply a new format specifier. 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 Of course, the normal dot fields would be put to use to allow us to specify how many total digits or digits of precision we wanted, or if we want zero prepend. (whatever makes the most sense, and keeps the standard most like what is already in the language): (%.12n % 12345678) == 12.34567800e+06 Do you think this idea has enough merit to make it to PEP status? --Keith Brafford -- http://mail.python.org/mailman/listinfo/python-list
Urgent
http://www.scribd.com/doc/30492594/If-Not-Busy-You-Could-Prevent-the-FINAL-WAR-Today This is not a Drill … PRIORITY ONE -- http://mail.python.org/mailman/listinfo/python-list
Re: Engineering numerical format PEP discussion
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. Background (for those who don't already know about engineering notation): Engineering notation (EN) is type of floating point representation. The idea with EN is that the powers of 10 are all multiples of 3, which correspond to the familiar Greek unit prefixes that engineers use when describing the different sizes of all sorts of real-world devices and phenomena: 1e-12 == pico 1e-9 == nano 1e-6 == micro 1e-3 == milli 1e+3 == kilo 1e+6 == mega 1e+9 == giga When people are talking about Ohms, Farads, Henries, Hz, and many others, they routinely have to normalize to EN. Fancy calculators from HP and TI routinely allow the users to go into engineering mode, but mysteriously things like C, Python, Excel, etc. don't For instance, no one talks about 4.7e-5F, as they would rather see 47e-6 (micro). Instead of 2.2e-2, engineers need to see 22.0e-3 (milli). snip There are places on the web where I've read that people have to work their butts off trying to trick Excel or OpenOffice to do engineering notation, or there is some work-around that is purported to work if you use the right version of the spreadsheet. Relevant related information: The Decimal datatype supports engineering format directly: http://docs.python.org/library/decimal.html#decimal.Decimal.to_eng_string Cheers, Chris -- http://blog.rebertia.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Engineering numerical format PEP discussion
On Sun, 25 Apr 2010 20:36:22 -0700, Keith wrote: I am considering writing a PEP for the inclusion of an engineering format specifier, and would appreciate input from others. [...] For instance, no one talks about 4.7e-5F, as they would rather see 47e-6 (micro). Instead of 2.2e-2, engineers need to see 22.0e-3 (milli). I'd be cautious about making claims about no one, because not everyone wants to see engineering notation. You may recall that the other common display format on scientific calculators is Scientific Notation, which *does* display 2.2e-2. After many months of using my EFloat class extensively with lots of apps dealing with embedded engineering tasks, it dawns on me that what we really need is simply a new format specifier. 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: I for one don't like %n. I already write %n for integer, at least now I get an error immediately instead of code that silently does the wrong thing. But I don't have a better idea of what letter to use. However, for good or ill the general consensus among the Python language developers is that % formatting is to be discouraged in favour of the format() method. For this reason, I expect that there will be zero (or negative) interest in extending the list of % format specifiers. But there may be some interest in adding a specifier to format(). http://docs.python.org/library/string.html#formatstrings It may be worth mentioning in the PEP that Decimals already have a method for converting to engineering notation, to_eng_string. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: Engineering numerical format PEP discussion
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... Cheers, Chris 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. --Keith Brafford -- http://mail.python.org/mailman/listinfo/python-list
Re: Engineering numerical format PEP discussion
On Apr 26, 12:29 am, Steven D'Aprano st...@remove-this- cybersource.com.au wrote: On Sun, 25 Apr 2010 20:36:22 -0700, Keith wrote: no one talks about 4.7e-5F, as they would rather see 47e-6 (micro). Instead of 2.2e-2, engineers need to see 22.0e-3 (milli). I'd be cautious about making claims about no one Good point, and I don't intend to belittle scientific computing folks for whom traditional floating point representation is expected. Nor am I suggesting that any of the six format specifiers that we already have for scientific notation (e, E, f, F, g, G) be altered in any way. I guess I wasn't clear about the F in the 4.7e-5F in the example. People doing engineering don't use 4.7e-5 Farads. They typically have to do extra work to get that number to print out correctly, as 47 e-6 Farads. The same goes for lots of signal processing entities. People doing things with Hz, seconds, you name it, have the same problem. --Keith -- http://mail.python.org/mailman/listinfo/python-list
Re: Engineering numerical format PEP discussion
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 -- http://mail.python.org/mailman/listinfo/python-list
Re: Engineering numerical format PEP discussion
On Mon, Apr 26, 2010 at 3:19 PM, Chris Rebert c...@rebertia.com wrote: 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) I just gave Page 20 a quick read, and it says: if the number is non-zero, the converted exponent is adjusted to be a multiple of three (engineering notation) by positioning the decimal point with one, two, or three characters preceding it (that is, the part before the decimal point will range from 1 through 999); Obviously that would make '1234567' not an Engineering notation? Cheers, Xav -- http://mail.python.org/mailman/listinfo/python-list
Re: Engineering numerical format PEP discussion
On Sun, Apr 25, 2010 at 10:25 PM, Xavier Ho cont...@xavierho.com wrote: On Mon, Apr 26, 2010 at 3:19 PM, Chris Rebert c...@rebertia.com wrote: 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) I just gave Page 20 a quick read, and it says: if the number is non-zero, the converted exponent is adjusted to be a multiple of three (engineering notation) by positioning the decimal point with one, two, or three characters preceding it (that is, the part before the decimal point will range from 1 through 999); Obviously that would make '1234567' not an Engineering notation? Well, I saw that too, but note how it's prefixed by (emphasis mine): The conversion **exactly follows the rules for conversion to scientific numeric string** except in the case of finite numbers **where exponential notation is used.** The description of to-scientific-string explains exactly when it uses exponential notation, but it gets slightly technical and I'm not interested enough, nor do I have the time at the moment, to read the entire spec. Cheers, Chris -- I hate RQAB-s http://blog.rebertia.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Engineering numerical format PEP discussion
On Apr 26, 1:19 am, Chris Rebert c...@rebertia.com wrote: 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. snip The spec:http://speleotrove.com/decimal/decarith.pdf (to-engineering-string is on page 20 if you're interested) Thanks for that. I didn't realize that Mike Cowlishaw wrote the spec we're discussing. It's too bad OS/2 didn't fare better, or we'd possibly be discussing a proposal for a REP (Rexx Enhancement Proposal) ;-) From that document it appears that my decimal.Decimal(1234567) example shows that the module has a bug: Doc says: [0,123,3] === 123E+3 But Python does: import decimal decimal.Decimal(123000).to_eng_string() '123000' Regardless, given that the whole point of format specifiers (whether they are the traditional python 2.x/C style %[whatever] strings, or the new format() function) is to make it easy for you to format numbers for printing, wouldn't the language be better off if we added engineering notation to the features that already offer scientific notation? --Keith Brafford -- http://mail.python.org/mailman/listinfo/python-list
Re: Engineering numerical format PEP discussion
On Mon, Apr 26, 2010 at 3:39 PM, Chris Rebert c...@rebertia.com wrote: The conversion **exactly follows the rules for conversion to scientific numeric string** except in the case of finite numbers **where exponential notation is used.** Well, then maybe the conversion doesn't exactly follow the rules, in this case. The description of to-scientific-string explains exactly when it uses exponential notation, but it gets slightly technical and I'm not interested enough, nor do I have the time at the moment, to read the entire spec. I understand. Emphasise mine, here: (so you don't have to read the entire spec) if the number is non-zero, the converted exponent is adjusted to be a multiple of three (engineering notation) by positioning the decimal point with one, two, or three characters preceding it* (that is, the part before the decimal point will range from 1 through 999); *Perhaps this module could use some improvement. It is already very, very good. Cheers, Xav -- http://mail.python.org/mailman/listinfo/python-list
[issue8525] Small enhancement to help()
Changes by Georg Brandl ge...@python.org: -- assignee: - georg.brandl nosy: +georg.brandl ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8525 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7865] io close() swallowing exceptions
Changes by Pascal Chambon chambon.pas...@gmail.com: Removed file: http://bugs.python.org/file17046/release_io_close_exceptions.patch ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7865 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7865] io close() swallowing exceptions
Pascal Chambon chambon.pas...@gmail.com added the comment: SHould be better this way then B-) -- Added file: http://bugs.python.org/file17077/no_swallow_on_close2.patch ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7865 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8528] typo in argparse documentation
New submission from akira 4kir4...@gmail.com: `messges` should be replaced by `messages` on http://docs.python.org/dev/library/argparse.html#upgrading-optparse-code page. -- assignee: d...@python components: Documentation messages: 104144 nosy: akira, d...@python severity: normal status: open title: typo in argparse documentation type: behavior ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8528 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8528] typo in argparse documentation
Georg Brandl ge...@python.org added the comment: Thanks, fixed in r80460. -- assignee: d...@python - nosy: +georg.brandl resolution: - fixed status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8528 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8522] enhacement proposal in howto/doanddont
Georg Brandl ge...@python.org added the comment: Thanks, applied in r80461. -- nosy: +georg.brandl resolution: - fixed status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8522 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue4147] xml.dom.minidom toprettyxml: omit whitespace for text-only elements
Changes by Dan Kenigsberg dan...@redhat.com: -- nosy: +danken ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue4147 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7946] Convoy effect with I/O bound threads and New GIL
Changes by Ray.Allen ysj@gmail.com: -- nosy: +ysj.ray ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7946 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8514] Create fs_encode() and fs_decode() functions in os.path
STINNER Victor victor.stin...@haypocalc.com added the comment: Please follow the naming convention used in os.path. The functions would have to be called os.path.fsencode() and os.path.fsdecode(). Ok Other than that, I'm +0 on the patch: the sys.filesystemencoding logic doesn't really work well in practice - on Unix and BSD platforms, there's no such thing as a single system-wide file system Today, most POSIX system uses utf8 by default for all partitions. If you mount an USB key, CD-Rom or network shared directory with the wrong options, you may get filenames in a different encoding. But this issue is not about fixing your OS configuration, but helping the most common case: a system using the same encoding everywhere (for the whole file system). You are still free to use directly the native OS type (unicode on Windows, bytes on other OS), ie. don't use fsencode()/fsdecode(). Python3 prefers unicode, eg. print expects an unicode string, not a byte string. I mean it's more pratical to use unicode everywhere in Python, and so fsencode()/fsdecode() can be really useful on POSIX systems. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8514 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8529] subclassing builtin class (str, unicode, list...) needs to override __getslice__
New submission from Florent Xicluna florent.xicl...@gmail.com:
It looks like a bug, because __getslice__ is deprecated since 2.0.
If you subclass a builtin type and override the __getitem__ method, you need to
override the (deprecated) __getslice__ method too.
And if you run your program with python -3, it
Example script:
class Upper(unicode):
def __getitem__(self, index):
return unicode.__getitem__(self, index).upper()
#def __getslice__(self, i, j):
#return self[i:j:]
if __name__ == '__main__':
text = Upper('Lorem ipsum')
print text[:]
print text[::]
--
components: Interpreter Core
messages: 104148
nosy: flox
priority: normal
severity: normal
status: open
title: subclassing builtin class (str, unicode, list...) needs to override
__getslice__
type: behavior
versions: Python 2.7
___
Python tracker rep...@bugs.python.org
http://bugs.python.org/issue8529
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[issue8530] Stringlib fastsearch can read beyond the front of an array
New submission from Alex alex.gay...@gmail.com: In Objects/stringlib/fastsearch.h the lines: if (!STRINGLIB_BLOOM(mask, s[i-1])) and if (!STRINGLIB_BLOOM(mask, s[i-1])) can read beyond the front of the array that is passed to it when the loop enters with i = 0. I originally noticed this when porting the algorithm to PyPy (which has bounds checking :)), all tests pass if I simple add `if i-1 = 0` before the conditional. This doesn't appear to actually cause the algorithm to ever break, but it is unsafe. -- messages: 104149 nosy: alex severity: normal status: open title: Stringlib fastsearch can read beyond the front of an array ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8530 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8530] Stringlib fastsearch can read beyond the front of an array
Changes by Antoine Pitrou pit...@free.fr: -- components: +Interpreter Core nosy: +flox priority: - normal stage: - needs patch type: - behavior versions: +Python 2.6, Python 2.7, Python 3.1, Python 3.2 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8530 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8530] Stringlib fastsearch can read beyond the front of an array
Florent Xicluna florent.xicl...@gmail.com added the comment: I guess we don't have the same issue with the find() implementation? if (!STRINGLIB_BLOOM(mask, s[i+m])) Because: * len(s) = n = (w + m) * the loop condition is (i = w) == s[w+m] is beyond the array, but it is '\0' probably Is it correct? -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8530 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8530] Stringlib fastsearch can read beyond the front of an array
Alex alex.gay...@gmail.com added the comment: Yes, as the comment of the top of the file notes, reading to s[n] (where n == len(s)) is safe because strings are null padded. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8530 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8510] update to autoconf2.65
Matthias Klose d...@debian.org added the comment: r80474: Replace AC_HELP_STRING with AS_HELP_STRING -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8510 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8530] Stringlib fastsearch can read beyond the front of an array
Florent Xicluna florent.xicl...@gmail.com added the comment: This patch should fix it. Since there's no failure, I don't find any test to add. -- keywords: +patch stage: needs patch - patch review Added file: http://bugs.python.org/file17078/issue8530_rfind.diff ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8530 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue6085] Logging in BaseHTTPServer.BaseHTTPRequestHandler causes lag
Charles-Francois Natali neolo...@free.fr added the comment: The attached patch caches the result of FQDN lookup. -- keywords: +patch Added file: http://bugs.python.org/file17079/base_http_server_fqdn_lag.diff ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue6085 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8530] Stringlib fastsearch can read beyond the front of an array
Antoine Pitrou pit...@free.fr added the comment: I can't manage to trigger any crash on a Linux machine, so I think we'll live without a test. -- nosy: +pitrou ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8530 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8530] Stringlib fastsearch can read beyond the front of an array
Antoine Pitrou pit...@free.fr added the comment: Of course your patch might slow down the loop, so perhaps you want to run some benchmarks. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8530 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8530] Stringlib fastsearch can read beyond the front of an array
Changes by Antoine Pitrou pit...@free.fr: -- versions: -Python 2.6, Python 3.1 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8530 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8510] update to autoconf2.65
Matthias Klose d...@debian.org added the comment: r80475: s/AC_AIX/AC_USE_SYSTEM_EXTENSIONS/ -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8510 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8526] msilib doesn't support multiple CAB instances in same installer
Bill Janssen bill.jans...@gmail.com added the comment: I'm certainly using the API provided by msilib, but perhaps I'm using it badly. Which API did you have in mind? I'm using msilib directly, not through bdist_msi. This seems like an artificial limitation to put on the Python library; the standard MSI spec supports 65K different cabs in a single installer. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8526 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8523] shutil.rmtree and os.listdir cannot recover on error conditions
Changes by Brett Cannon br...@python.org: -- assignee: - tarek nosy: +tarek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8523 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue6085] Logging in BaseHTTPServer.BaseHTTPRequestHandler causes lag
Santoso Wijaya santa@me.com added the comment: Doesn't that only cache the first remote client it encounters, though? Maybe a dictionary of caches? -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue6085 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8526] msilib doesn't support multiple CAB instances in same installer
Martin v. Löwis mar...@v.loewis.de added the comment: I still don't see the need to create multiple CABs. Just use the Directory class to add files, and that will automatically record them in the singleton CAB. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8526 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue6085] Logging in BaseHTTPServer.BaseHTTPRequestHandler causes lag
Changes by Charles-Francois Natali neolo...@free.fr: Removed file: http://bugs.python.org/file17079/base_http_server_fqdn_lag.diff ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue6085 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue6483] Modules are not deallocated correctly if m_size = -1
Antoine Pitrou pit...@free.fr added the comment: Well, in 2.x you didn't even have the choice. The dict of an extension module was always copied, becoming essentially immortal. In 3.x you can use an m_size=0 so as to disable this behaviour. -- nosy: +pitrou versions: +Python 3.2 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue6483 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue5099] subprocess.POpen.__del__() AttributeError (os module == None!)
Brett Cannon br...@python.org added the comment: New patch updated to at least r80476. -- Added file: http://bugs.python.org/file17080/subprocess_shutdown.diff ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue5099 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue5099] subprocess.POpen.__del__() AttributeError (os module == None!)
Changes by Brett Cannon br...@python.org: Removed file: http://bugs.python.org/file16976/subprocess__del__.diff ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue5099 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8510] update to autoconf2.65
Matthias Klose d...@debian.org added the comment: r80478 converts all obsolete AC_TRY_* macros to AC_*_IFELSE, the outcome is ... nothing (but whitespace changes): $ svn diff --diff-cmd diff -x -uEwB configure Index: configure === --- configure (Revision 80475) +++ configure (Arbeitskopie) @@ -1,5 +1,5 @@ #! /bin/sh -# From configure.in Revision: 80474 . +# From configure.in Revision: 80475 . # Guess values for system-dependent variables and create Makefiles. # Generated by GNU Autoconf 2.65 for python 3.2. # running configure with the old and the new version shows no diffs (besides config.log). -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8510 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue6085] Logging in BaseHTTPServer.BaseHTTPRequestHandler causes lag
Charles-Francois Natali neolo...@free.fr added the comment: Doesn't that only cache the first remote client it encounters, though? Maybe a dictionary of caches? A BaseHTTPRequestHandler is instantiated every time a client connects, so there should be only one client per handler, no (the cache is an attribute of the handler, not the server) ? -- Added file: http://bugs.python.org/file17081/base_http_server_fqdn_lag.diff ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue6085 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8530] Stringlib fastsearch can read beyond the front of an array
Benjamin Peterson benja...@python.org added the comment: Why add a bounds check if it can't be caused to fail. How about just a comment? -- nosy: +benjamin.peterson ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8530 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8530] Stringlib fastsearch can read beyond the front of an array
Alex alex.gay...@gmail.com added the comment: Well, the fact that it hasn't been shown to fail doesn't mean it can't fail. It relies on reading undefined memory, which is usually bad ;). However, since we're at i=0, regardless of what we add to the value it's going to end up terminating the loop, so I'm not sure if it can actually break in practice. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8530 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8510] update to autoconf2.65
Matthias Klose d...@debian.org added the comment: r80481: configure.in: Avoid autoconf warning: Assume C89 semantics that RETSIGTYPE is always void (issue #8510). Keep the definition, although the python code itself doesn't use it anymore. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8510 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8510] update to autoconf2.65
Matthias Klose d...@debian.org added the comment: r80483: Makefile.pre.in (autoconf): Call autoconf/autoheader with -Wall to help the configure script to stay warning free. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8510 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8530] Stringlib fastsearch can read beyond the front of an array
Antoine Pitrou pit...@free.fr added the comment: It could read into an invalid page and segfault. It depends on specifics of the memory allocator. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8530 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8529] subclassing builtin class (str, unicode, list...) needs to override __getslice__
Benjamin Peterson benja...@python.org added the comment: This is because unicode implements __getslice__. -- nosy: +benjamin.peterson resolution: - invalid status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8529 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8529] subclassing builtin class (str, unicode, list...) needs to override __getslice__
Florent Xicluna florent.xicl...@gmail.com added the comment: OK, but it yields Python 3 DeprecationWarning in the subclass. And there's no workaround to get rid of the deprecation. If it is the correct behaviour, maybe some words could be added about subclassing builtin types: http://docs.python.org/reference/datamodel.html#additional-methods-for-emulation-of-sequence-types -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8529 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8529] subclassing builtin class (str, unicode, list...) needs to override __getslice__
Florent Xicluna florent.xicl...@gmail.com added the comment: OK, I said nothing, it is already in the doc. :-) -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8529 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue2302] Uses of SocketServer.BaseServer.shutdown have a race
Antoine Pitrou pit...@free.fr added the comment: Fixed with a test in r80484 (trunk), r80486 (2.6), r80487 (py3k), r80491 (3.1). -- resolution: - fixed stage: - committed/rejected status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue2302 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7319] Silence DeprecationWarning by default
Brett Cannon br...@python.org added the comment: -Q now works like -3 by causing the DeprecationWarning silencing to be skipped. Committed in r80492. -- resolution: - fixed status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7319 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8391] os.execvpe() doesn't support surrogates in env
STINNER Victor victor.stin...@haypocalc.com added the comment: I blocked the fix in Python 3.1 because it's non trivial and I prefer to avoid complex changes in Python 3.1. But then I realized that Python 3.1 has two bugs about environment variables. It uses sys.getfilesystemencoding()+surrogateecape to decode variables and sys.getdefaultencoding()+strict to encode variables: the encoding is different! It counts the number of *characters* to allocate the *byte* string buffer and so non-ASCII values are truncated. So I decided to backport the fix: r80494. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8391 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7288] Detect improper leading whitespace in C files for Vim
Changes by Brett Cannon br...@python.org: -- resolution: - wont fix status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7288 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
