Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

Another solution (works in 3.6 too): set idpattern to 
r'(?-i:[_a-zA-Z][_a-zA-Z0-9]*)'.

This looks pretty weird, setting the re.IGNORECASE flag and then unsetting it. 
But it works, and don't break the user code that changes idpattern without 
changing flags.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue31672>
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