Quentin Wenger <wenger.quen...@bluewin.ch> added the comment:
And there's no need for a cryptic encoding like cp1250 for this problem to
arise. Here is a simple example with Python's default encoding utf-8:
```
>>> a = "ú"
>>> b = list(re.match(b"(?P<" + a.encode() + b">)", b"").groupdict())[0]
>>> a.isidentifier()
True
>>> b.isidentifier()
True
>>> b
'ú'
>>> a.encode() == b.encode("latin1")
True
```
For reference, here is the very source of the issue:
https://github.com/python/cpython/blob/master/Lib/sre_parse.py#L228
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<https://bugs.python.org/issue40980>
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