Steve Dower added the comment:

Happy to discuss further. I'll try and get a new patch done today that disables 
the handler for any threads Python creates a thread state for. The change to 
_Py_VERIFY_FD will still be there, but the begin/end suppress will go (using 
the verify function to protect CRT calls can go completely once we are prepared 
to force people to build with VC14, but I want to avoid that for as long as 
possible while we transition).

Also notice that Verify_fd is a race condition but was the best solution 
available at the time. I'm keen to see it go.

As far as a better solution goes, I've discussed this in depth with the main 
CRT developer at Microsoft and there won't be one. The best concession I could 
get was the thread local handler so we can disable it locally rather than 
process wide.

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<http://bugs.python.org/issue23524>
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