akira added the comment:
Related: issue4926 "putenv() accepts names containing '=', return value of
unsetenv() not checked"
`os.environ.clear()` also fails if the environment contains names with `=`:
>>> import os
>>> os.environ['a=b'] = 'c'
>>> os.environ.clear()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/.../lib/python3.4/_collections_abc.py", line 558, in clear
self.popitem()
File "/.../lib/python3.4/_collections_abc.py", line 551, in popitem
del self[key]
File "/.../lib/python3.4/os.py", line 662, in __delitem__
self.unsetenv(encodedkey)
OSError: [Errno 22] Invalid argument
----------
nosy: +akira
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<http://bugs.python.org/issue20658>
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