Add globalns and localns to the inspect.signature and inspect.Signature.from_callable

[isidentical]

BPO	41960
Nosy	@gvanrossum, @1st1, @isidentical
PRs	bpo-41960: Add globalns and localns parameters to inspect.signature and Signature.from_callable #22583

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2020-12-23.22:45:52.586>
created_at = <Date 2020-10-06.20:39:01.138>
labels = ['type-feature', 'library', '3.10']
title = 'Add globalns and localns to the inspect.signature and inspect.Signature.from_callable'
updated_at = <Date 2020-12-23.22:45:52.585>
user = 'https://github.com/isidentical'

bugs.python.org fields:

activity = <Date 2020-12-23.22:45:52.585>
actor = 'BTaskaya'
assignee = 'none'
closed = True
closed_date = <Date 2020-12-23.22:45:52.586>
closer = 'BTaskaya'
components = ['Library (Lib)']
creation = <Date 2020-10-06.20:39:01.138>
creator = 'BTaskaya'
dependencies = []
files = []
hgrepos = []
issue_num = 41960
keywords = ['patch']
message_count = 4.0
messages = ['378137', '383219', '383648', '383663']
nosy_count = 3.0
nosy_names = ['gvanrossum', 'yselivanov', 'BTaskaya']
pr_nums = ['22583']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue41960'
versions = ['Python 3.10']

[isidentical]

To resolve annotations in local namespaces (and possibly in different contexts), inspect.signature can take globalns and localns parameters.

I'm not inclined to add these into the getfullargspec, but I'd appreciate any comments about whether it is a good idea or not!

[gvanrossum]

It's been a while, I've lost context for this idea. What problem are you trying to solve here? Are there issues where people have reported problems that this would allow them to solve?

[isidentical]

It's been a while, I've lost context for this idea. What problem are you trying to solve here? Are there issues where people have reported problems that this would allow them to solve?

Context: #20434 (comment)

tl;dr:
import inspect

def foo():
    class F: ...
    def foo(bar: F): ...
    print(inspect.signature(foo))

foo()

Normally, if inspect.signature is able to resolve annotations with the current globals()/locals() it will give the resolved version, if not the string version. So adding this would allow people to choose which namespace inspect.signature will pass to the typing.get_type_hints. (inspect.signature(foo, localns=locals()) would give directly the F object instead of 'F', etc.)

[isidentical]

New changeset eee1c77 by Batuhan Taskaya in branch 'master':
bpo-41960: Add globalns and localns parameters to inspect.signature and Signature.from_callable (GH-22583)
eee1c77