[issue21481] Argpase Namespace object methods __eq__ and __ne__ raise TypeError when comparing to None

[Joe Borg]

New submission from Joe Borg:

See example:

>>> import argparse
>>> a = argparse.ArgumentParser()
>>> b = a.parse_args([])
>>> if b != None:
...     print "hey"
  File "<stdin>", line 2
    print "hey"
              ^
SyntaxError: invalid syntax
>>> 
>>> if b != None:           
... 	print("hey")
... 
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/cfd/software/Python/340/lib/python3.4/argparse.py", line 1202, in __ne__
    return not (self == other)
  File "/cfd/software/Python/340/lib/python3.4/argparse.py", line 1199, in __eq__
    return vars(self) == vars(other)
TypeError: vars() argument must have __dict__ attribute

----------
components: Library (Lib)
messages: 218326
nosy: Joe.Borg
priority: normal
severity: normal
status: open
title: Argpase Namespace object methods __eq__ and __ne__  raise TypeError when comparing to None
versions: Python 2.7, Python 3.1, Python 3.2, Python 3.3, Python 3.4, Python 3.5

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21481>
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