New submission from Johannes Raggam <thete...@gmail.com>:

The following is valid Python 2:

>>> 'okay {0:s}'.format(Exception('test'))
'okay test'
>>> 'okay {0}'.format(Exception('test'))
'okay test'

The following fails on Python 3.6:

>>> 'okay {0:s}'.format(Exception('test'))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unsupported format string passed to Exception.__format__

While this doesn't fail:

>>> 'okay {0}'.format(Exception('test'))
'okay test'

----------
components: ctypes
messages: 319402
nosy: thet
priority: normal
severity: normal
status: open
title: Incomplete format string syntax for Exceptions
versions: Python 3.6

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue33848>
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