Move getmethparlist function from turtle to inspect module

Feature or enhancement

Proposal:

The getmethpartlist turtle module function does work which seems to be supposed to be done by the inspect module.

In fact, getmethpartlist calls inspect.signature and then iterates over it to produce a call to the callable. Perhaps this second part could also be implemented in the inspect module.

In an issue, @terryjreedy said, “For calls that just want the call signature, I wonder if calling getmethodparlist could be replaced by calling signature.”

So, my suggestion is to add two new methods to Signature class, which:

1. Returns the call:

class Signature():
    def as_call(self) -> string : ...

2. Returns a new Signature without the first parameter if ob is a method:

class Signature():
    def as_function(self): ...

Then, getmethpartlist could be:

def getmethpartlist(ob):
    defs = inspect.signature(ob).as_function()
    call = defs.as_call()
   return str(defs), call

Thoughts?

Has this already been discussed elsewhere?

No response given

Links to previous discussion of this feature:

https://discuss.python.org/t/move-getmethparlist-function-from-turtle-to-inspect-module/97172

Review getmethpartlist in Lib/turtle.py and the existing inspect.Signature API first. Read the linked discussion and prior issue comment to determine whether call-generation and method-parameter handling belong in inspect. Done requires an agreed API and behavior before implementation scope can be identified.