Kristján Valur Jónsson <krist...@ccpgames.com> added the comment:

Yes, this is the biggest reason why this is required.
This, and and os.closerange().
I have browsed the CRT source and I find no way to determine if a fd is 
actually valid, before calling any of the functions that check for it.
Reintroducing the assertion will prevent a debug build python from passing the 
testsuite.
Much as I think this is useful (turning on the crt tests helped me find a 
couple of python bugs recently) it unfortunately needs to be off because of 
os.close().  All other troublesome cases (strftime(), open()) have workarounds.

Kristján

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue4804>
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