TypedDict inspect.signature error

[jhwang]

BPO	46448
Nosy	@serhiy-storchaka, @JelleZijlstra, @tirkarthi

^{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 = None
created_at = <Date 2022-01-20.23:20:43.587>
labels = ['library', '3.10']
title = 'TypedDict inspect.signature error'
updated_at = <Date 2022-01-21.08:31:24.912>
user = 'https://bugs.python.org/jhwang'

bugs.python.org fields:

activity = <Date 2022-01-21.08:31:24.912>
actor = 'xtreak'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2022-01-20.23:20:43.587>
creator = 'jhwang'
dependencies = []
files = []
hgrepos = []
issue_num = 46448
keywords = []
message_count = 2.0
messages = ['411056', '411097']
nosy_count = 4.0
nosy_names = ['serhiy.storchaka', 'JelleZijlstra', 'xtreak', 'jhwang']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue46448'
versions = ['Python 3.10']

[jhwang]

I have Python 3.10.1 (Dec, 2021) installed and I see an error when inspecting signature of TypedDict class. This is the same issue reported on bpo-43006 (msg385535 - (view)). It was marked as resolved but the error looks persistent. Can someone confirm if this was fixed or any release version with the fix?

    import inspect

    class T(typing.TypedDict):
        a: int

    print(inspect.signature(T))

was (*args, **kwargs) and now raises ValueError: no signature found for builtin type <class 'dict'>

[tirkarthi]

This could be due to bpo-40187

[gvanrossum]

Since inspect.signature(dict) also fails I don't see why it should be made to pass for TypedDict specifically.

[gvanrossum]

Rejected, see discussion in the PR.