ruff/crates/ty_python_semantic/resources/mdtest/subscript/tuple.md

Tuple subscripts

Indexing

t = (1, "a", "b")

reveal_type(t[0])  # revealed: Literal[1]
reveal_type(t[1])  # revealed: Literal["a"]
reveal_type(t[-1])  # revealed: Literal["b"]
reveal_type(t[-2])  # revealed: Literal["a"]

reveal_type(t[False])  # revealed: Literal[1]
reveal_type(t[True])  # revealed: Literal["a"]

a = t[4]  # error: [index-out-of-bounds]
reveal_type(a)  # revealed: Unknown

b = t[-4]  # error: [index-out-of-bounds]
reveal_type(b)  # revealed: Unknown

Slices

def _(m: int, n: int):
    t = (1, "a", None, b"b")

    reveal_type(t[0:0])  # revealed: tuple[()]
    reveal_type(t[0:1])  # revealed: tuple[Literal[1]]
    reveal_type(t[0:2])  # revealed: tuple[Literal[1], Literal["a"]]
    reveal_type(t[0:4])  # revealed: tuple[Literal[1], Literal["a"], None, Literal[b"b"]]
    reveal_type(t[0:5])  # revealed: tuple[Literal[1], Literal["a"], None, Literal[b"b"]]
    reveal_type(t[1:3])  # revealed: tuple[Literal["a"], None]

    reveal_type(t[-2:4])  # revealed: tuple[None, Literal[b"b"]]
    reveal_type(t[-3:-1])  # revealed: tuple[Literal["a"], None]
    reveal_type(t[-10:10])  # revealed: tuple[Literal[1], Literal["a"], None, Literal[b"b"]]

    reveal_type(t[0:])  # revealed: tuple[Literal[1], Literal["a"], None, Literal[b"b"]]
    reveal_type(t[2:])  # revealed: tuple[None, Literal[b"b"]]
    reveal_type(t[4:])  # revealed: tuple[()]
    reveal_type(t[:0])  # revealed: tuple[()]
    reveal_type(t[:2])  # revealed: tuple[Literal[1], Literal["a"]]
    reveal_type(t[:10])  # revealed: tuple[Literal[1], Literal["a"], None, Literal[b"b"]]
    reveal_type(t[:])  # revealed: tuple[Literal[1], Literal["a"], None, Literal[b"b"]]

    reveal_type(t[::-1])  # revealed: tuple[Literal[b"b"], None, Literal["a"], Literal[1]]
    reveal_type(t[::2])  # revealed: tuple[Literal[1], None]
    reveal_type(t[-2:-5:-1])  # revealed: tuple[None, Literal["a"], Literal[1]]
    reveal_type(t[::-2])  # revealed: tuple[Literal[b"b"], Literal["a"]]
    reveal_type(t[-1::-3])  # revealed: tuple[Literal[b"b"], Literal[1]]

    reveal_type(t[None:2:None])  # revealed: tuple[Literal[1], Literal["a"]]
    reveal_type(t[1:None:1])  # revealed: tuple[Literal["a"], None, Literal[b"b"]]
    reveal_type(t[None:None:None])  # revealed: tuple[Literal[1], Literal["a"], None, Literal[b"b"]]

    start = 1
    stop = None
    step = 2
    reveal_type(t[start:stop:step])  # revealed: tuple[Literal["a"], Literal[b"b"]]

    reveal_type(t[False:True])  # revealed: tuple[Literal[1]]
    reveal_type(t[True:3])  # revealed: tuple[Literal["a"], None]

    t[0:4:0]  # error: [zero-stepsize-in-slice]
    t[:4:0]  # error: [zero-stepsize-in-slice]
    t[0::0]  # error: [zero-stepsize-in-slice]
    t[::0]  # error: [zero-stepsize-in-slice]

    tuple_slice = t[m:n]
    reveal_type(tuple_slice)  # revealed: tuple[Literal[1, "a", b"b"] | None, ...]

Slices of homogeneous and mixed tuples

[environment]
python-version = "3.11"

from typing import Literal

def homogeneous(t: tuple[str, ...]) -> None:
    reveal_type(t[0])  # revealed: str
    reveal_type(t[1])  # revealed: str
    reveal_type(t[2])  # revealed: str
    reveal_type(t[3])  # revealed: str

    reveal_type(t[-1])  # revealed: str
    reveal_type(t[-2])  # revealed: str
    reveal_type(t[-3])  # revealed: str
    reveal_type(t[-4])  # revealed: str

def mixed(s: tuple[str, ...]) -> None:
    t = (1, 2, 3) + s + (8, 9, 10)

    reveal_type(t[0])  # revealed: Literal[1]
    reveal_type(t[1])  # revealed: Literal[2]
    reveal_type(t[2])  # revealed: Literal[3]
    reveal_type(t[3])  # revealed: str | Literal[8]
    reveal_type(t[4])  # revealed: str | Literal[8, 9]
    reveal_type(t[5])  # revealed: str | Literal[8, 9, 10]

    reveal_type(t[-1])  # revealed: Literal[10]
    reveal_type(t[-2])  # revealed: Literal[9]
    reveal_type(t[-3])  # revealed: Literal[8]
    reveal_type(t[-4])  # revealed: Literal[3] | str
    reveal_type(t[-5])  # revealed: Literal[2, 3] | str
    reveal_type(t[-6])  # revealed: Literal[1, 2, 3] | str

tuple as generic alias

For tuple instances, we can track more detailed information about the length and element types of the tuple. This information carries over to the generic alias that the tuple is an instance of.

def _(a: tuple, b: tuple[int], c: tuple[int, str], d: tuple[int, ...]) -> None:
    reveal_type(a)  # revealed: tuple[Unknown, ...]
    reveal_type(b)  # revealed: tuple[int]
    reveal_type(c)  # revealed: tuple[int, str]
    reveal_type(d)  # revealed: tuple[int, ...]

reveal_type(tuple)  # revealed: <class 'tuple'>
reveal_type(tuple[int])  # revealed: <class 'tuple[int]'>
reveal_type(tuple[int, str])  # revealed: <class 'tuple[int, str]'>
reveal_type(tuple[int, ...])  # revealed: <class 'tuple[int, ...]'>

Inheritance

[environment]
python-version = "3.9"

class A(tuple[int, str]): ...

# revealed: tuple[<class 'A'>, <class 'tuple[int, str]'>, <class 'Sequence[int | str]'>, <class 'Reversible[int | str]'>, <class 'Collection[int | str]'>, <class 'Iterable[int | str]'>, <class 'Container[int | str]'>, typing.Protocol, typing.Generic, <class 'object'>]
reveal_type(A.__mro__)

class C(tuple): ...

# revealed: tuple[<class 'C'>, <class 'tuple[Unknown, ...]'>, <class 'Sequence[Unknown]'>, <class 'Reversible[Unknown]'>, <class 'Collection[Unknown]'>, <class 'Iterable[Unknown]'>, <class 'Container[Unknown]'>, typing.Protocol, typing.Generic, <class 'object'>]
reveal_type(C.__mro__)

typing.Tuple

Correspondence with tuple

typing.Tuple can be used interchangeably with tuple:

from typing import Any, Tuple

class A: ...

def _(c: Tuple, d: Tuple[int, A], e: Tuple[Any, ...]):
    reveal_type(c)  # revealed: tuple[Unknown, ...]
    reveal_type(d)  # revealed: tuple[int, A]
    reveal_type(e)  # revealed: tuple[Any, ...]

Inheritance

Inheriting from Tuple results in a MRO with builtins.tuple and typing.Generic. Tuple itself is not a class.

[environment]
python-version = "3.9"

from typing import Tuple

class A(Tuple[int, str]): ...

# revealed: tuple[<class 'A'>, <class 'tuple[int, str]'>, <class 'Sequence[int | str]'>, <class 'Reversible[int | str]'>, <class 'Collection[int | str]'>, <class 'Iterable[int | str]'>, <class 'Container[int | str]'>, typing.Protocol, typing.Generic, <class 'object'>]
reveal_type(A.__mro__)

class C(Tuple): ...

# revealed: tuple[<class 'C'>, <class 'tuple[Unknown, ...]'>, <class 'Sequence[Unknown]'>, <class 'Reversible[Unknown]'>, <class 'Collection[Unknown]'>, <class 'Iterable[Unknown]'>, <class 'Container[Unknown]'>, typing.Protocol, typing.Generic, <class 'object'>]
reveal_type(C.__mro__)