FazBrowse GitHub Viewer | Trending |
URL:
| Home
Tools: [Download Repo ZIP]   [Original HTTPS Page]

fix: Allow instantiation of type[None] in analyze_type_type_callee by codenamenam · Pull Request #19782 · python/mypy · GitHub

  1. python
  2. mypy

Repository navigation

fix: Allow instantiation of type[None] in analyze_type_type_callee #19782

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
hauntsaninja merged 7 commits into from
Oct 21, 2026
Conversation 9 Commits 7 Checks 24 Files changed
Merged

fix: Allow instantiation of type[None] in analyze_type_type_callee #19782

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
7 commits
Select commit Hold shift + click to select a range
6377f4f
fix: Allow instantiation of type[None] in analyze_type_type_callee
codenamenam Sep 2, 2025
f9330a7
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Sep 2, 2025
8ee1ec8
test: Add type assertion for NoneType() return value
codenamenam Sep 9, 2025
d8901de
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Sep 9, 2025
3dcecdf
test: Add builtins fixtures/tuple.pyi
codenamenam Sep 9, 2025
ff0be30
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Sep 9, 2025
feab014
review
hauntsaninja Oct 21, 2026
File filter

Filter by extension

Filter by extension .py  (1) .test  (1) All 2 file types selected
Viewed files
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Unified
Split
Hide whitespace
Diff view
Unified
Split
Hide whitespace
11 changes: 11 additions & 0 deletions mypy/checkexpr.py
Show comments
View file
Open in desktop
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode characters
Show hidden characters
Original file line number Diff line number Diff line change
Expand Up @@ -1926,6 +1926,17 @@ def analyze_type_type_callee(self, item: ProperType, context: Context) -> Type:
return self.analyze_type_type_callee(tuple_fallback(item), context)
if isinstance(item, TypedDictType):
return self.typeddict_callable_from_context(item)
if isinstance(item, NoneType):
# NoneType() returns None, so treat it as a callable that returns None
return CallableType(
arg_types=[],
arg_kinds=[],
arg_names=[],
ret_type=NoneType(),
fallback=self.named_type("builtins.function"),
name=None,
from_type_type=True,
)

self.msg.unsupported_type_type(item, context)
return AnyType(TypeOfAny.from_error)
Expand Down
17 changes: 17 additions & 0 deletions test-data/unit/check-classes.test
Show comments
View file
Open in desktop
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode characters
Show hidden characters
Original file line number Diff line number Diff line change
Expand Up @@ -3866,6 +3866,23 @@ def f(a: Type[Tuple[int, int]]):
a() # E: Cannot instantiate type "type[tuple[int, int]]"
[builtins fixtures/tuple.pyi]

[case testTypeUsingTypeCNoneType]
from typing_extensions import assert_type

NoneType = type(None)
assert_type(type(None)(), None)
assert_type(NoneType(), None)

def f(n: type[None]):
assert_type(n(), None)
n(1) # E: Too many arguments
def g(n: type[NoneType]):
assert_type(n(), None)

f(NoneType)
g(NoneType)
[builtins fixtures/tuple.pyi]

[case testTypeUsingTypeCNamedTuple]
from typing import Type, NamedTuple
N = NamedTuple('N', [('x', int), ('y', int)])
Expand Down
Loading
Back | FazBrowse Home | New Git URL