Message 261101 - Python tracker

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Content 
There seems to be a bug in configparser when setting new values in extended interpolation:

python --version
Python 3.5.1

from configparser import ConfigParser, ExtendedInterpolation
c=ConfigParser(interpolation=ExtendedInterpolation)
c.add_section('test')
c.set('test', 'key', 'value')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3.5/configparser.py", line 1190, in set
    super().set(section, option, value)
  File "/usr/lib/python3.5/configparser.py", line 891, in set
    value)
TypeError: before_set() missing 1 required positional argument: 'value'

It works ithout extended interpolation, though.