Feature or enhancement

Update the docstrings tooperator.itemgetter,operator.attrgetter, andoperator.methodcaller so that they will automatically be given__text_signature__ strings soinspect.signature will give correct signature.

Pitch

These are the only functions inoperator that don't have signatures.operator functions are often used when programming in a functional style, and sometimes signature inspection is useful to e.g. determine whether a call is valid or whether to curry arguments.

Also, as a user, I find it nice to see accurate text signatures in the docstring and when callinghelp(func).

Previous discussion

These were intentionally skipped whenoperator functions were updated to use the argument clinic. See:

• Derby #18: Convert 31 sites to Argument Clinic across 23 files #64385 (comment)
• orhttps://bugs.python.org/issue20186#msg244971

PR forthcoming.