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[ty] Detect illegal multiple inheritance with NamedTuple (#19943)

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Alex Waygood 2025-08-18 13:03:01 +01:00 • committed by GitHub
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crates/ty/docs/rules.md generated
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@ -36,7 +36,7 @@ def test(): -> "int":
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20call-non-callable) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L102)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L103)
</small>
**What it does**
@ -58,7 +58,7 @@ Calling a non-callable object will raise a `TypeError` at runtime.
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20conflicting-argument-forms) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L146)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L147)
</small>
**What it does**
@ -88,7 +88,7 @@ f(int) # error
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20conflicting-declarations) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L172)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L173)
</small>
**What it does**
@ -117,7 +117,7 @@ a = 1
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20conflicting-metaclass) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L197)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L198)
</small>
**What it does**
@ -147,7 +147,7 @@ class C(A, B): ...
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20cyclic-class-definition) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L223)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L224)
</small>
**What it does**
@ -177,7 +177,7 @@ class B(A): ...
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20duplicate-base) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L288)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L289)
</small>
**What it does**
@ -202,7 +202,7 @@ class B(A, A): ...
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20duplicate-kw-only) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L309)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L310)
</small>
**What it does**
@ -306,7 +306,7 @@ def test(): -> "Literal[5]":
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20inconsistent-mro) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L451)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L478)
</small>
**What it does**
@ -334,7 +334,7 @@ class C(A, B): ...
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20index-out-of-bounds) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L475)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L502)
</small>
**What it does**
@ -358,7 +358,7 @@ t[3] # IndexError: tuple index out of range
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20instance-layout-conflict) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L341)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L342)
</small>
**What it does**
@ -445,7 +445,7 @@ an atypical memory layout.
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-argument-type) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L520)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L547)
</small>
**What it does**
@ -470,7 +470,7 @@ func("foo") # error: [invalid-argument-type]
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-assignment) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L560)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L587)
</small>
**What it does**
@ -496,7 +496,7 @@ a: int = ''
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-attribute-access) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1594)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1621)
</small>
**What it does**
@ -528,7 +528,7 @@ C.instance_var = 3 # error: Cannot assign to instance variable
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-await) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L582)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L609)
</small>
**What it does**
@ -562,7 +562,7 @@ asyncio.run(main())
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-base) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L612)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L639)
</small>
**What it does**
@ -584,7 +584,7 @@ class A(42): ... # error: [invalid-base]
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-context-manager) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L663)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L690)
</small>
**What it does**
@ -609,7 +609,7 @@ with 1:
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-declaration) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L684)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L711)
</small>
**What it does**
@ -636,7 +636,7 @@ a: str
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-exception-caught) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L707)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L734)
</small>
**What it does**
@ -678,7 +678,7 @@ except ZeroDivisionError:
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-generic-class) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L743)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L770)
</small>
**What it does**
@ -709,7 +709,7 @@ class C[U](Generic[T]): ...
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-key) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L495)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L522)
</small>
**What it does**
@ -738,7 +738,7 @@ alice["height"] # KeyError: 'height'
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-legacy-type-variable) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L769)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L796)
</small>
**What it does**
@ -771,7 +771,7 @@ def f(t: TypeVar("U")): ...
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-metaclass) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L818)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L845)
</small>
**What it does**
@ -798,12 +798,42 @@ class B(metaclass=f): ...
- [Python documentation: Metaclasses](https://docs.python.org/3/reference/datamodel.html#metaclasses)
## `invalid-named-tuple`
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-named-tuple) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L452)
</small>
**What it does**
Checks for invalidly defined `NamedTuple` classes.
**Why is this bad?**
An invalidly defined `NamedTuple` class may lead to the type checker
drawing incorrect conclusions. It may also lead to `TypeError`s at runtime.
**Examples**
A class definition cannot combine `NamedTuple` with other base classes
in multiple inheritance; doing so raises a `TypeError` at runtime. The sole
exception to this rule is `Generic[]`, which can be used alongside `NamedTuple`
in a class's bases list.
```pycon
>>> from typing import NamedTuple
>>> class Foo(NamedTuple, object): ...
TypeError: can only inherit from a NamedTuple type and Generic
```
## `invalid-overload`
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-overload) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L845)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L872)
</small>
**What it does**
@ -851,7 +881,7 @@ def foo(x: int) -> int: ...
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-parameter-default) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L888)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L915)
</small>
**What it does**
@ -875,7 +905,7 @@ def f(a: int = ''): ...
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-protocol) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L423)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L424)
</small>
**What it does**
@ -907,7 +937,7 @@ TypeError: Protocols can only inherit from other protocols, got <class 'int'>
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-raise) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L908)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L935)
</small>
Checks for `raise` statements that raise non-exceptions or use invalid
@ -954,7 +984,7 @@ def g():
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-return-type) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L541)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L568)
</small>
**What it does**
@ -977,7 +1007,7 @@ def func() -> int:
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-super-argument) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L951)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L978)
</small>
**What it does**
@ -1031,7 +1061,7 @@ TODO #14889
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-type-alias-type) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L797)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L824)
</small>
**What it does**
@ -1056,7 +1086,7 @@ NewAlias = TypeAliasType(get_name(), int) # error: TypeAliasType name mus
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-type-checking-constant) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L990)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1017)
</small>
**What it does**
@ -1084,7 +1114,7 @@ TYPE_CHECKING = ''
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-type-form) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1014)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1041)
</small>
**What it does**
@ -1112,7 +1142,7 @@ b: Annotated[int] # `Annotated` expects at least two arguments
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-type-guard-call) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1066)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1093)
</small>
**What it does**
@ -1144,7 +1174,7 @@ f(10) # Error
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-type-guard-definition) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1038)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1065)
</small>
**What it does**
@ -1176,7 +1206,7 @@ class C:
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20invalid-type-variable-constraints) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1094)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1121)
</small>
**What it does**
@ -1209,7 +1239,7 @@ T = TypeVar('T', bound=str) # valid bound TypeVar
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20missing-argument) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1123)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1150)
</small>
**What it does**
@ -1232,7 +1262,7 @@ func() # TypeError: func() missing 1 required positional argument: 'x'
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20no-matching-overload) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1142)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1169)
</small>
**What it does**
@ -1259,7 +1289,7 @@ func("string") # error: [no-matching-overload]
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20non-subscriptable) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1165)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1192)
</small>
**What it does**
@ -1281,7 +1311,7 @@ Subscripting an object that does not support it will raise a `TypeError` at runt
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20not-iterable) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1183)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1210)
</small>
**What it does**
@ -1305,7 +1335,7 @@ for i in 34: # TypeError: 'int' object is not iterable
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20parameter-already-assigned) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1234)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1261)
</small>
**What it does**
@ -1359,7 +1389,7 @@ def test(): -> "int":
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20static-assert-error) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1570)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1597)
</small>
**What it does**
@ -1387,7 +1417,7 @@ static_assert(int(2.0 * 3.0) == 6) # error: does not have a statically known tr
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20subclass-of-final-class) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1325)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1352)
</small>
**What it does**
@ -1414,7 +1444,7 @@ class B(A): ... # Error raised here
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20too-many-positional-arguments) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1370)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1397)
</small>
**What it does**
@ -1439,7 +1469,7 @@ f("foo") # Error raised here
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20type-assertion-failure) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1348)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1375)
</small>
**What it does**
@ -1465,7 +1495,7 @@ def _(x: int):
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20unavailable-implicit-super-arguments) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1391)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1418)
</small>
**What it does**
@ -1509,7 +1539,7 @@ class A:
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20unknown-argument) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1448)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1475)
</small>
**What it does**
@ -1534,7 +1564,7 @@ f(x=1, y=2) # Error raised here
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20unresolved-attribute) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1469)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1496)
</small>
**What it does**
@ -1560,7 +1590,7 @@ A().foo # AttributeError: 'A' object has no attribute 'foo'
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20unresolved-import) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1491)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1518)
</small>
**What it does**
@ -1583,7 +1613,7 @@ import foo # ModuleNotFoundError: No module named 'foo'
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20unresolved-reference) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1510)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1537)
</small>
**What it does**
@ -1606,7 +1636,7 @@ print(x) # NameError: name 'x' is not defined
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20unsupported-bool-conversion) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1203)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1230)
</small>
**What it does**
@ -1641,7 +1671,7 @@ b1 < b2 < b1 # exception raised here
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20unsupported-operator) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1529)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1556)
</small>
**What it does**
@ -1667,7 +1697,7 @@ A() + A() # TypeError: unsupported operand type(s) for +: 'A' and 'A'
<small>
Default level: [`error`](../rules.md#rule-levels "This lint has a default level of 'error'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20zero-stepsize-in-slice) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1551)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1578)
</small>
**What it does**
@ -1690,7 +1720,7 @@ l[1:10:0] # ValueError: slice step cannot be zero
<small>
Default level: [`warn`](../rules.md#rule-levels "This lint has a default level of 'warn'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20deprecated) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L267)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L268)
</small>
**What it does**
@ -1743,7 +1773,7 @@ a = 20 / 0 # type: ignore
<small>
Default level: [`warn`](../rules.md#rule-levels "This lint has a default level of 'warn'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20possibly-unbound-attribute) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1255)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1282)
</small>
**What it does**
@ -1769,7 +1799,7 @@ A.c # AttributeError: type object 'A' has no attribute 'c'
<small>
Default level: [`warn`](../rules.md#rule-levels "This lint has a default level of 'warn'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20possibly-unbound-implicit-call) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L120)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L121)
</small>
**What it does**
@ -1799,7 +1829,7 @@ A()[0] # TypeError: 'A' object is not subscriptable
<small>
Default level: [`warn`](../rules.md#rule-levels "This lint has a default level of 'warn'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20possibly-unbound-import) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1277)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1304)
</small>
**What it does**
@ -1829,7 +1859,7 @@ from module import a # ImportError: cannot import name 'a' from 'module'
<small>
Default level: [`warn`](../rules.md#rule-levels "This lint has a default level of 'warn'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20redundant-cast) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1622)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1649)
</small>
**What it does**
@ -1854,7 +1884,7 @@ cast(int, f()) # Redundant
<small>
Default level: [`warn`](../rules.md#rule-levels "This lint has a default level of 'warn'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20undefined-reveal) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1430)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1457)
</small>
**What it does**
@ -1905,7 +1935,7 @@ a = 20 / 0 # ty: ignore[division-by-zero]
<small>
Default level: [`warn`](../rules.md#rule-levels "This lint has a default level of 'warn'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20unresolved-global) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1643)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1670)
</small>
**What it does**
@ -1959,7 +1989,7 @@ def g():
<small>
Default level: [`warn`](../rules.md#rule-levels "This lint has a default level of 'warn'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20unsupported-base) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L630)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L657)
</small>
**What it does**
@ -1996,7 +2026,7 @@ class D(C): ... # error: [unsupported-base]
<small>
Default level: [`ignore`](../rules.md#rule-levels "This lint has a default level of 'ignore'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20division-by-zero) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L249)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L250)
</small>
**What it does**
@ -2018,7 +2048,7 @@ Dividing by zero raises a `ZeroDivisionError` at runtime.
<small>
Default level: [`ignore`](../rules.md#rule-levels "This lint has a default level of 'ignore'.") ·
[Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20possibly-unresolved-reference) ·
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1303)
[View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L1330)
</small>
**What it does**