[Bug 1048710] Re: Regression in argparse for Python 2.7, 3.2 and 3.3
clint at fewbar.com
Sat Sep 15 16:17:43 UTC 2012
Thanks for doing this on a Saturday doko. Confirming, this fixes Juju.
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Regression in argparse for Python 2.7, 3.2 and 3.3
Status in Python:
Status in “python2.7” package in Ubuntu:
Status in “python3.2” package in Ubuntu:
Using the following example:
parser = argparse.ArgumentParser()
parser.add_argument("--test", dest="test", type=str,
args = parser.parse_args()
Then running it with simply "python test.py" (WITHOUT passing --test), you get the following:
Traceback (most recent call last):
File "test.py", line 11, in <module>
AttributeError: 'str' object has no attribute 'append'
My understanding of argparse is that when using both default= and
action="append", args.test should always be a list, empty if not
passing --test or a list containing the --test values if passed. After
the recent update, it seems to instead default to an empty string.
This must somehow be related to the type field as for some reason,
removing "type=str" fixes the issue though I don't really see why and
it's still a clear regression.
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