ruff/crates/ty_python_semantic/resources/mdtest/assignment/annotations.md

Assignment with annotations

Annotation only transparent to local inference

x = 1
x: int
y = x

reveal_type(y)  # revealed: Literal[1]

Violates own annotation

x: int = "foo"  # error: [invalid-assignment] "Object of type `Literal["foo"]` is not assignable to `int`"

Violates previous annotation

x: int
x = "foo"  # error: [invalid-assignment] "Object of type `Literal["foo"]` is not assignable to `int`"

Tuple annotations are understood

[environment]
python-version = "3.12"

module.py:

from typing_extensions import Unpack

a: tuple[()] = ()
b: tuple[int] = (42,)
c: tuple[str, int] = ("42", 42)
d: tuple[tuple[str, str], tuple[int, int]] = (("foo", "foo"), (42, 42))
e: tuple[str, ...] = ()
f: tuple[str, *tuple[int, ...], bytes] = ("42", b"42")
g: tuple[str, Unpack[tuple[int, ...]], bytes] = ("42", b"42")
h: tuple[list[int], list[int]] = ([], [])
i: tuple[str | int, str | int] = (42, 42)
j: tuple[str | int] = (42,)

script.py:

from module import a, b, c, d, e, f, g, h, i, j

reveal_type(a)  # revealed: tuple[()]
reveal_type(b)  # revealed: tuple[int]
reveal_type(c)  # revealed: tuple[str, int]
reveal_type(d)  # revealed: tuple[tuple[str, str], tuple[int, int]]

# TODO: homogeneous tuples, PEP-646 tuples, generics
reveal_type(e)  # revealed: @Todo(full tuple[...] support)
reveal_type(f)  # revealed: @Todo(full tuple[...] support)
reveal_type(g)  # revealed: @Todo(full tuple[...] support)
reveal_type(h)  # revealed: tuple[@Todo(specialized non-generic class), @Todo(specialized non-generic class)]

reveal_type(i)  # revealed: tuple[str | int, str | int]
reveal_type(j)  # revealed: tuple[str | int]

Incorrect tuple assignments are complained about

# error: [invalid-assignment] "Object of type `tuple[Literal[1], Literal[2]]` is not assignable to `tuple[()]`"
a: tuple[()] = (1, 2)

# error: [invalid-assignment] "Object of type `tuple[Literal["foo"]]` is not assignable to `tuple[int]`"
b: tuple[int] = ("foo",)

# error: [invalid-assignment] "Object of type `tuple[list, Literal["foo"]]` is not assignable to `tuple[str | int, str]`"
c: tuple[str | int, str] = ([], "foo")

PEP-604 annotations are supported

def foo(v: str | int | None, w: str | str | None, x: str | str):
    reveal_type(v)  # revealed: str | int | None
    reveal_type(w)  # revealed: str | None
    reveal_type(x)  # revealed: str

Attribute expressions in type annotations are understood

import builtins

int = "foo"
a: builtins.int = 42

# error: [invalid-assignment] "Object of type `Literal["bar"]` is not assignable to `int`"
b: builtins.int = "bar"

c: builtins.tuple[builtins.tuple[builtins.int, builtins.int], builtins.int] = ((42, 42), 42)

# error: [invalid-assignment] "Object of type `Literal["foo"]` is not assignable to `tuple[tuple[int, int], int]`"
c: builtins.tuple[builtins.tuple[builtins.int, builtins.int], builtins.int] = "foo"

Future annotations are deferred

from __future__ import annotations

x: Foo

class Foo: ...

x = Foo()
reveal_type(x)  # revealed: Foo

Annotations in stub files are deferred

x: Foo

class Foo: ...

x = Foo()
reveal_type(x)  # revealed: Foo

Annotated assignments in stub files are inferred correctly

x: int = 1
reveal_type(x) # revealed: Literal[1]