Roundup Robot added the comment:
New changeset 1b614921aefa by R David Murray in branch '3.2':
#12776,#11839: call argparse type function only once.
http://hg.python.org/cpython/rev/1b614921aefa
New changeset 74f6d87cd471 by R David Murray in branch 'default':
Merge #12776,#11839: call argparse
Changes by Paolo Elvati elv...@umich.edu:
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resolution: - duplicate
status: open - closed
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Changes by Paolo Elvati elv...@umich.edu:
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status: closed - open
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Changes by Paolo Elvati elv...@umich.edu:
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status: open - closed
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Mike Meyer m...@mired.org added the comment:
Steven - 12776 indeed fixes this issue. I applied the patch from it to a build
of todays checkout, verified that my simple test script worked, then wrote some
test cases for test_argparse.
I've uploaded the patch for that test to both issues. I
Steven Bethard steven.beth...@gmail.com added the comment:
I think Issue 12776, which delays type conversions on defaults, should solve
this problem, right? If you agree, could you add your code here as a test case
to that issue and mark this as duplicate?
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Stefan Pfeiffer stefan.pfeif...@gmail.com added the comment:
Happens in 3.2, too...
Would be nice to see that fixed.
Stefan
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nosy: +Stefan.Pfeiffer
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Manveru manv...@manveru.pl added the comment:
I have the same issue with default here with 2.7.
Fortunately I have my own type function so I can prevent is by changing my
internal state. This is however only a workaround for real bug in the argparse.
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nosy: +manveru
versions:
New submission from Paolo Elvati elv...@umich.edu:
Hi,
when a default is specified for a file argument that is open with writing
permission (FileType('w')), the default file is always created even if the
argument is specified in the command line.
For example he code:
import argparse
parser
