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

Is something left to do here?

In 3.7 r'(?-i:[_a-zA-Z][_a-zA-Z0-9]*)' can be replaced with 
r'(?a:[_a-z][_a-z0-9]*)' if it will add clarity.

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