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Bad interaction between ParamSpec and TypeVarTuple

bugmypy got something wrongmypy got something wrong

topic-paramspecPEP 612, ParamSpec, ConcatenatePEP 612, ParamSpec, Concatenate

topic-pep-646PEP 646 (TypeVarTuple, Unpack)PEP 646 (TypeVarTuple, Unpack)

Status: Open.

#19855 In python/mypy;

· randolf-scholz opened on Sep 15, 2025

AssertionError when using <code>reveal_type</code> on a class-bound <code>ParamSpec</code>.

crash

topic-paramspecPEP 612, ParamSpec, ConcatenatePEP 612, ParamSpec, Concatenate

topic-type-variables

Status: Open.

#19839 In python/mypy;

· JBushagour opened on Sep 12, 2025

<code>mypy</code> doesn't understand that <code>*args: P.args</code> implies that <code>args</code> is a <code>tuple</code>

bugmypy got something wrongmypy got something wrong

topic-callsFunction calls, *args, **kwargs, defaultsFunction calls, *args, **kwargs, defaults

topic-paramspecPEP 612, ParamSpec, ConcatenatePEP 612, ParamSpec, Concatenate

Status: Open.

#19663 In python/mypy;

· randolf-scholz opened on Aug 15, 2025

<code>NamedTuple</code> parametrized with a <code>ParamSpec</code> can't be used as an annotation

bugmypy got something wrongmypy got something wrong

topic-named-tuple

topic-paramspecPEP 612, ParamSpec, ConcatenatePEP 612, ParamSpec, Concatenate

Status: Open.

#19658 In python/mypy;

· sbrudenell opened on Aug 14, 2025

ParamSpec seems to get lost with partial()

bugmypy got something wrongmypy got something wrong

topic-paramspecPEP 612, ParamSpec, ConcatenatePEP 612, ParamSpec, Concatenate

topic-runtime-semanticsmypy doesn't model runtime semantics correctlymypy doesn't model runtime semantics correctly

Status: Open.

#18589 In python/mypy;

· Dreamsorcerer opened on Feb 2, 2025

mypy failed to return correct overloaded func type when decorate func accepts more than one parameter

bugmypy got something wrongmypy got something wrong

topic-overloads

topic-paramspecPEP 612, ParamSpec, ConcatenatePEP 612, ParamSpec, Concatenate

Status: Open.

#18167 In python/mypy;

· uriyyo opened on Nov 19, 2024

Incompatible ParamSpecs are not reported as issue

bugmypy got something wrongmypy got something wrong

topic-paramspecPEP 612, ParamSpec, ConcatenatePEP 612, ParamSpec, Concatenate

topic-type-variables

Status: Open.

#17766 In python/mypy;

· pfaion opened on Sep 13, 2024

Case of generic decorators not working on generic callables (ParamSpec)

bugmypy got something wrongmypy got something wrong

topic-paramspecPEP 612, ParamSpec, ConcatenatePEP 612, ParamSpec, Concatenate

Status: Open.

#17621 In python/mypy;

· kcdodd opened on Aug 1, 2024

using a decorator on an overloaded function where the decorator uses <code>Concatenate</code> causes false positive "Overloaded function implementation does not accept all possible arguments" error

bugmypy got something wrongmypy got something wrong

topic-paramspecPEP 612, ParamSpec, ConcatenatePEP 612, ParamSpec, Concatenate

Status: Open.

#17459 In python/mypy;

· DetachHead opened on Jul 1, 2024

<code>--extra-checks</code> is too strict when using <code>Concatenate</code> within a <code>Protocol</code>

bugmypy got something wrongmypy got something wrong

topic-paramspecPEP 612, ParamSpec, ConcatenatePEP 612, ParamSpec, Concatenate

Status: Open.

#17122 In python/mypy;

· Daverball opened on Apr 14, 2024

Support TypedDict unpacking in ParamSpec specifications

feature

topic-paramspecPEP 612, ParamSpec, ConcatenatePEP 612, ParamSpec, Concatenate

topic-typed-dict

Status: Open.

#16120 In python/mypy;

· tmke8 opened on Sep 15, 2023

More principled solution for universal quantificatoin of non-Callable types

feature

priority-2-low

topic-paramspecPEP 612, ParamSpec, ConcatenatePEP 612, ParamSpec, Concatenate

topic-type-variables

Status: Open.

#15909 In python/mypy;

· ilevkivskyi opened on Aug 18, 2023