New submission from STINNER Victor:

I compiled Python 3.6 in debug mode on Windows, and I'm trying to run 
test_regrtest to try to reproduce a bug. The problem is that the test opens a 
million of popup. Clicking on Ignore is useless, the popup continues to 
reappear again and again. The stderr is also flooded with "Assertion error ..." 
with the MSCRT.

I don't understand the usage of this popup and this error message. Python 
already raises a nice OSError when a FD is invalid.

Can we please always turn these warnings off even in debug mode when calling a 
MSCRT function protected by _Py_BEGIN_SUPPRESS_IPH/_Py_END_SUPPRESS_IPH?

See also issue #25001 "Make --nowindows argument to regrtest propagate when 
running with -j".

----------
components: Windows
messages: 252226
nosy: haypo, paul.moore, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: Windows: python opens a popup and flood stderr with assertion error on 
FD error
versions: Python 3.5, Python 3.6

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue25305>
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