docs April 2010

docs@python.org

14 participants
20 discussions

[issue8557] subprocess portability issue

by Dave Abrahams

New submission from Dave Abrahams <dave(a)boostpro.com>: On POSIX systems, the PATH environment variable is always used to look up directory-less executable names passed as the first argument to Popen(...), but on Windows, PATH is only considered when shell=True is also passed. Actually I think it may be slightly weirder than that when shell=False, because the following holds for me: C:\>rem ##### Prepare minimal PATH ##### C:\>set "PATH=C:\Python26\Scripts;C:\Python26;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem" C:\>rem ##### Prepare a minimal, clean environment ##### C:\>virtualenv --no-site-packages e:\zzz New python executable in e:\zzz\Scripts\python.exe Installing setuptools................done. C:\>rem ##### Show that shell=True makes the difference in determining whether PATH is respected ##### C:\>python Python 2.6.5 (r265:79096, Mar 19 2010, 18:02:59) [MSC v.1500 64 bit (AMD64)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> import subprocess >>> subprocess.Popen(['python', '-c', 'import sys; print sys.executable']) <subprocess.Popen object at 0x0000000001DBE080> >>> C:\Python26\python.exe >>> subprocess.Popen(['python', '-c', 'import sys; print sys.executable'], env={'PATH':r'e:\zzz\Scripts'}) <subprocess.Popen object at 0x0000000001F05A90> >>> C:\Python26\python.exe >>> subprocess.Popen(['python', '-c', 'import sys; print sys.executable'], env={'PATH':r'e:\zzz\Scripts'}, shell=True) <subprocess.Popen object at 0x0000000001F05B00> >>> e:\zzz\Scripts\python.exe That is, it looks like the environment at the time Python is invoked is what counts unless I pass shell=True. I don't even seem to be able to override this behavior by changing os.environ: you can clear() it and pass env={} and subprocess.Popen(['python']) still succeeds. This is a very important problem for portable code and one that took me hours to suss out. I think: a) the current behavior needs to be documented b) it needs to be fixed if possible c) otherwise, shell=True should be the default ---------- assignee: docs@python components: Documentation messages: 104422 nosy: dabrahams, docs@python priority: normal severity: normal status: open title: subprocess portability issue type: behavior versions: Python 2.6 _______________________________________ Python tracker <report(a)bugs.python.org> <http://bugs.python.org/issue8557> _______________________________________

2 years, 7 months

[issue8556] Confusing string formatting examples

by Jeff McNeil

New submission from Jeff McNeil <jeff(a)jmcneil.net>: I was going through the string formatting examples this evening and noticed this: print '%(language)s has %(#)03d quote types.' % \ {'language': "Python", "#": 2} The example uses a '#' as a map key. This is somewhat misleading as if we had simply left the parenthesis off, the '#' would have been interpreted as an alternate conversion flag. Should be updated to use a more verbose (and less confusing) dictionary key. ---------- assignee: docs@python components: Documentation files: stdtypes.rst.2.6.5.patch keywords: patch messages: 104410 nosy: docs@python, mcjeff priority: normal severity: normal status: open title: Confusing string formatting examples versions: Python 2.6 Added file: http://bugs.python.org/file17115/stdtypes.rst.2.6.5.patch _______________________________________ Python tracker <report(a)bugs.python.org> <http://bugs.python.org/issue8556> _______________________________________

10 years, 3 months

[issue8562] hasattr(open, 'newlines') example gives incorrect results from PEP0278

by AdamN

New submission from AdamN <adam(a)varud.com>: This bug from the Ubuntu list is being moved here: https://bugs.launchpad.net/ubuntu/+source/python-defaults/+bug/570737 Newlines support is enabled on Ubuntu but the example from: http://www.python.org/dev/peps/pep-0278/ Does not give the correct results (of True): if hasattr(open, 'newlines'): print 'We have universal newline support' I don't know if this is a documentation problem or whether there is another attr that matters here. ---------- assignee: docs@python components: Documentation, Windows messages: 104454 nosy: adamnelson, docs@python priority: normal severity: normal status: open title: hasattr(open,'newlines') example gives incorrect results from PEP0278 type: behavior versions: Python 2.6 _______________________________________ Python tracker <report(a)bugs.python.org> <http://bugs.python.org/issue8562> _______________________________________

10 years, 5 months

[issue8564] Update documentation on doctest/unittest2 integration

by Peter Fein

New submission from Peter Fein <pfein(a)pobox.com>: The documentation on integrating doctests in a file of unittests is confusing and out of date. This patch updates the documentation to use unittest2 test discovery. ---------- assignee: docs@python components: Documentation files: doctest_unittest_integration_doc.diff keywords: patch messages: 104468 nosy: docs@python, pfein priority: normal severity: normal status: open title: Update documentation on doctest/unittest2 integration versions: Python 2.7, Python 3.3 Added file: http://bugs.python.org/file17123/doctest_unittest_integration_doc.diff _______________________________________ Python tracker <report(a)bugs.python.org> <http://bugs.python.org/issue8564> _______________________________________

10 years, 6 months

ftplib nit

by Larry Tjoelker

in ftplib docs, http://docs.python.org/library/ftplib.html?highlight=ftplib#module-ftplib, description of ftplib.all_errors 3rd line: "errors made by the caller). This set includes the four exceptions listed below as" It should be: "errors made by the caller). This set includes the four exceptions listed above as"

10 years, 8 months

[issue8543] asynchat documentation issues

by Giampaolo Rodola'

New submission from Giampaolo Rodola' <g.rodola(a)gmail.com>: I recently took a look at asynchat doc and found out it has some issues which should be addressed. In my opinion the following methods and functions should NOT be mentioned: - async_chat.refill_buffer() this has been removed in Python 2.6 and no longer exists, plus there was no reason to override it in the first place as it was an internal method - asynchat.find_prefix_at_end(haystack, needle) there's really no reason to mention this one, it is just used internally by async_chat class to implement the terminator logic - async_chat.handle_close() - async_chat.readable() - async_chat.writable() - async_chat.handle_read() - async_chat.handle_write() all inherited from asyncore, plus, aside from handle_close(), they should *NOT* be overridden as they implement the entire logic behind asynchat module - class asynchat.simple_producer(data[, buffer_size=512]) - class asynchat.fifo([list=None]) as discussed in issue 6916 these are very old classes which are no longer used; imho not worth to be mentioned in the doc - async_chat._collect_incoming_data(data) - async_chat._get_data() both added in 2.6 (this isn't mentioned), not sure if it's worth mentioning them (I wouldn't) but they're basically private methods which are never used in the base class and only provide a sample implementation I think asynchat documentation should focus more on showing those parts of the API which are really going to be used, basically push*(), close_when_done() and terminator-related methods. All other methods like handle_*(), etc..., are deliberately not supposed to be used and only create confusion. I think I'm going to attach a patch tomorrow but I'd like to hear the opinion of Josiah Carlson before doing anything. ---------- assignee: docs@python components: Documentation messages: 104292 nosy: docs@python, giampaolo.rodola, josiah.carlson, josiahcarlson, r.david.murray priority: normal severity: normal status: open title: asynchat documentation issues versions: Python 2.6, Python 2.7, Python 3.1, Python 3.2 _______________________________________ Python tracker <report(a)bugs.python.org> <http://bugs.python.org/issue8543> _______________________________________

10 years, 8 months

Error in unittest deprecation notice

by Nick Coghlan

Just spotted this in the docs for 2.7: """ Deprecated since version 2.7: failUnless(); use one of the assert variants. assert_(); use assertTrue().""" Cheers, Nick. -- Nick Coghlan | ncoghlan(a)gmail.com | Brisbane, Australia ---------------------------------------------------------------

10 years, 8 months

I found a bug in tutorial document

by DongWoo Son

Hi. in this document, http://docs.python.org/py3k/tutorial/datastructures.html >>> basket = {'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}>>> print(basket){'orange', 'banana', 'pear', 'apple'}>>> fruit = ['apple', 'orange', 'apple', 'pear', 'orange', 'banana']>>> fruit = set(basket) # create a set without duplicates the last sentence should be like below one. basket was originally set, so we don't need to change to set redundantly I think. * >>> fruit = set(fruit) # create a set without duplicates *

10 years, 8 months

[issue8558] StringIO().truncate causes zero-bytes in getvalue()

by Antoine Pitrou

Antoine Pitrou <pitrou(a)free.fr> added the comment: I've updated the doc in r80591. Sorry for the inconvenience! ---------- resolution: -> invalid status: open -> closed _______________________________________ Python tracker <report(a)bugs.python.org> <http://bugs.python.org/issue8558> _______________________________________

10 years, 8 months

py2 fileConfig in module logging.config missing description for disable_existing_loggers

by Reimar Bauer

Hi disable_existing_loggers should be described also for py versions < 3k fileConfig(fname, defaults=None, disable_existing_loggers=1) from the http://docs.python.org/py3k/library/logging.html If disable_existing_loggers is true, any existing loggers that are not children of named loggers will be disabled. cheers Reimar

10 years, 8 months

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