STINNER Victor <victor.stin...@haypocalc.com> added the comment:

> Maybe the PYTHONWARNINGS code should be moved there instead?

sys.warnoptions is read by the warnings module (not the _warnings module) when 
this module is loaded. The warnings module is loaded by Py_InitializeEx() if 
sys.warnoptions list is not empty.

It might be possible to read PYTHONWARNINGS env var after initfsencoding() but 
before loading the warnings module. But we have to ensure that 
Py_InitializeEx() can still be called multiple times.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue9988>
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