ruff/crates/ty_python_semantic/resources/mdtest/call/subclass_of.md

Call type[...]

Single class

Trivial constructor

class C: ...

def _(subclass_of_c: type[C]):
    reveal_type(subclass_of_c())  # revealed: C

Non-trivial constructor

class C:
    def __init__(self, x: int): ...

def _(subclass_of_c: type[C]):
    reveal_type(subclass_of_c(1))  # revealed: C

    # error: [invalid-argument-type] "Argument to this function is incorrect: Expected `int`, found `Literal["a"]`"
    reveal_type(subclass_of_c("a"))  # revealed: C
    # error: [missing-argument] "No argument provided for required parameter `x` of bound method `__init__`"
    reveal_type(subclass_of_c())  # revealed: C
    # error: [too-many-positional-arguments] "Too many positional arguments to bound method `__init__`: expected 1, got 2"
    reveal_type(subclass_of_c(1, 2))  # revealed: C

Dynamic base

from typing import Any
from ty_extensions import Unknown

def _(subclass_of_any: type[Any], subclass_of_unknown: type[Unknown]):
    reveal_type(subclass_of_any())  # revealed: Any
    reveal_type(subclass_of_any("any", "args", 1, 2))  # revealed: Any
    reveal_type(subclass_of_unknown())  # revealed: Unknown
    reveal_type(subclass_of_unknown("any", "args", 1, 2))  # revealed: Unknown

Unions of classes

class A: ...
class B: ...

def _(subclass_of_ab: type[A | B]):
    reveal_type(subclass_of_ab())  # revealed: A | B