[Pyobjc-dev] Python 3 + pyobjc_unicode + strptime = crash

[Virgil D. <hs...@ha...>]

Hi,

(Sorry for not submitting it to the tracker, I don't remember my old
SF login, I dislike SF and I want to avoid dealing with it.)

I uncovered a bug today. Under Python 3, when using a pyobjc_unicode
with strptime, I get a this crash:

Traceback (most recent call last):
  File "pyobjc_strptime_bug.py", line 6, in <module>
    print(datetime.strptime(s, '%Y-%m-%d'))
  File "/Library/Frameworks/Python.framework/Versions/3.1/lib/python3.1/_strptime.py",
line 335, in _strptime
    data_string[found.end():])
ValueError: unconverted data remains: o

I created a script that reproduces the bug:

from Foundation import NSString
s = NSString.alloc().initWithString_('2010-09-08')
print(type(s))
# Very interesting, the bug only shows up if datetime is imported here
instead of at the top
from datetime import datetime
print(datetime.strptime(s, '%Y-%m-%d'))

As the comment says in the script, the interesting thing is that the
crash only happens if the datetime import happens after the allocation
of the NSString. If you move the import at the top, the crash doesn't
happen anymore and the function behaves as expected.

For now, the workaround I do in my project is to explicitly cast my
input to str() and it works.

Virgil Dupras