Quentin Wenger <wenger.quen...@bluewin.ch> added the comment:
Of course an inconvenience in my program is not per se the reason to change the
language. I just wanted to motivate that the current situation gives unexpected
results.
"\xe9" doesn't look like proper utf-8 to me:
```
>>> "é".encode("latin-1")
b'\xe9'
>>> "é".encode()
b'\xc3\xa9'
```
Let's try another one: how would you go for Δ ("\u0394") as a group name?
```
>>> "Δ".encode()
b'\xce\x94'
>>> "Δ".encode("latin-1")
Traceback (most recent call last):
File "<pyshell#21>", line 1, in <module>
"Δ".encode("latin-1")
UnicodeEncodeError: 'latin-1' codec can't encode character '\u0394' in position
0: ordinal not in range(256)
>>> re.match(b'(?P<\xce\x94>)', b'').groupdict()
Traceback (most recent call last):
File "<pyshell#16>", line 1, in <module>
re.match(b'(?P<\xce\x94>)', b'').groupdict()
File "/usr/lib/python3.8/re.py", line 191, in match
return _compile(pattern, flags).match(string)
File "/usr/lib/python3.8/re.py", line 304, in _compile
p = sre_compile.compile(pattern, flags)
File "/usr/lib/python3.8/sre_compile.py", line 764, in compile
p = sre_parse.parse(p, flags)
File "/usr/lib/python3.8/sre_parse.py", line 948, in parse
p = _parse_sub(source, state, flags & SRE_FLAG_VERBOSE, 0)
File "/usr/lib/python3.8/sre_parse.py", line 443, in _parse_sub
itemsappend(_parse(source, state, verbose, nested + 1,
File "/usr/lib/python3.8/sre_parse.py", line 703, in _parse
raise source.error(msg, len(name) + 1)
re.error: bad character in group name 'Î\x94' at position 4
>>> re.match(b'(?P<\u0394>)', b'').groupdict()
Traceback (most recent call last):
File "<pyshell#12>", line 1, in <module>
re.match(b'(?P<\u0394>)', b'').groupdict()
File "/usr/lib/python3.8/re.py", line 191, in match
return _compile(pattern, flags).match(string)
File "/usr/lib/python3.8/re.py", line 304, in _compile
p = sre_compile.compile(pattern, flags)
File "/usr/lib/python3.8/sre_compile.py", line 764, in compile
p = sre_parse.parse(p, flags)
File "/usr/lib/python3.8/sre_parse.py", line 948, in parse
p = _parse_sub(source, state, flags & SRE_FLAG_VERBOSE, 0)
File "/usr/lib/python3.8/sre_parse.py", line 443, in _parse_sub
itemsappend(_parse(source, state, verbose, nested + 1,
File "/usr/lib/python3.8/sre_parse.py", line 703, in _parse
raise source.error(msg, len(name) + 1)
re.error: bad character in group name '\\u0394' at position 4
```
----------
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue40980>
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