[issue2931] optparse: various problems with unicode and gettext

[Sean Wang]

Sean Wang added the comment:

Sorry, missed one condition:
I used `unicode_literals` in Python 2.7.10, example below:

>>> from __future__ import unicode_literals
>>> str('api名称')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
UnicodeEncodeError: 'ascii' codec can't encode characters in position 3-4: ordinal not in range(128)

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<http://bugs.python.org/issue2931>
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