[New-bugs-announce] [issue43067] inspect.signature(bytes.hex) raises ValueError "builtin has invalid signature"

[Борис Верховский]

New submission from Борис Верховский <boris.verk at gmail.com>:

On Python 3.9

>>> import inspect
>>> inspect.signature(bytes.hex)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3.9/inspect.py", line 3118, in signature
    return Signature.from_callable(obj, follow_wrapped=follow_wrapped)
  File "/usr/lib/python3.9/inspect.py", line 2867, in from_callable
    return _signature_from_callable(obj, sigcls=cls,
  File "/usr/lib/python3.9/inspect.py", line 2322, in _signature_from_callable
    return _signature_from_builtin(sigcls, obj,
  File "/usr/lib/python3.9/inspect.py", line 2135, in _signature_from_builtin
    return _signature_fromstr(cls, func, s, skip_bound_arg)
  File "/usr/lib/python3.9/inspect.py", line 2005, in _signature_fromstr
    raise ValueError("{!r} builtin has invalid signature".format(obj))
ValueError: <method 'hex' of 'bytes' objects> builtin has invalid signature


This is also true for memoryview.hex and bytearray.hex . This happens because

>>> bytes.hex.__text_signature__
'($self, /, sep=<unrepresentable>, bytes_per_sep=1)'

when it would make more sense for it to return

'($self, /, sep='', bytes_per_sep=1)'

or at least sep=None

----------
components: Library (Lib)
messages: 385940
nosy: boris
priority: normal
severity: normal
status: open
title: inspect.signature(bytes.hex) raises ValueError "builtin has invalid signature"
type: enhancement
versions: Python 3.10

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43067>
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