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mriedem/gist:4f6ea2e61ea82d6ade6f

Created March 9, 2016 16:36
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gistfile1.txt
>>> msg_fmt = "Not authorized."
>>> kwargs = {'code': 403, 'reason': ''}
>>>
>>> msg_fmt % kwargs
'Not authorized.'
>>> msg_fmt = "Not authorized: %(derp)s"
>>> msg_fmt % kwargs
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
KeyError: 'derp'
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