we must never create exceptions with unicode error messages, because then str(exc), print exc, and "%s" % exc will raise UnicodeEncodeErrors.
An example of one of these is path.get_py_filename, which creates an IOError with %s on a path that can be unicode. When in doubt, use %r when building exception messages.
See:
Or the output of any time we such an error might be raised, e.g:
In [8]: raise IOError("file %s does not exist" % u'é')
---------------------------------------------------------------------------
IOError Traceback (most recent call last)
/Users/minrk/dev/ip/mine/<ipython-input-8-1e82695b5095> in <module>()
----> 1 raise IOError("file %s does not exist" % u'é')
<type 'str'>: (<type 'exceptions.UnicodeEncodeError'>, UnicodeEncodeError('ascii', u'file \xe9 does not exist', 5, 6, 'ordinal not in range(128)'))
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