[issue37032] Add CodeType.replace() method

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

Once Python 3.8 beta1 will be released, it would be interesting to patch all projects that I had to be fixed to handle the new "posonlyargcount" to use the new "replace()" method is available.

Maybe even remove the fix for Python 3.8 alpha 4 and only use use replace() on Python 3.8 and newer.

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<https://bugs.python.org/issue37032>
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