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check-python313.test
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[case testPEP695TypeParameterDefaultSupported]
class C[T = None]: ...
def f[T = list[int]]() -> None: ...
def g[**P = [int, str]]() -> None: ...
type A[T, S = int, U = str] = list[T]
[case testPEP695TypeParameterDefaultBasic]
from typing import Callable
def f1[T1 = int](a: T1) -> list[T1]: ...
reveal_type(f1) # N: Revealed type is "def [T1 = builtins.int] (a: T1`-1 = builtins.int) -> builtins.list[T1`-1 = builtins.int]"
def f2[**P1 = [int, str]](a: Callable[P1, None]) -> Callable[P1, None]: ...
reveal_type(f2) # N: Revealed type is "def [P1 = [builtins.int, builtins.str]] (a: def (*P1.args, **P1.kwargs)) -> def (*P1.args, **P1.kwargs)"
def f3[*Ts1 = *tuple[int, str]](a: tuple[*Ts1]) -> tuple[*Ts1]: ...
reveal_type(f3) # N: Revealed type is "def [Ts1 = Unpack[Tuple[builtins.int, builtins.str]]] (a: Tuple[Unpack[Ts1`-1 = Unpack[Tuple[builtins.int, builtins.str]]]]) -> Tuple[Unpack[Ts1`-1 = Unpack[Tuple[builtins.int, builtins.str]]]]"
class ClassA1[T1 = int]: ...
class ClassA2[**P1 = [int, str]]: ...
class ClassA3[*Ts1 = *tuple[int, str]]: ...
reveal_type(ClassA1) # N: Revealed type is "def [T1 = builtins.int] () -> __main__.ClassA1[T1`1 = builtins.int]"
reveal_type(ClassA2) # N: Revealed type is "def [P1 = [builtins.int, builtins.str]] () -> __main__.ClassA2[P1`1 = [builtins.int, builtins.str]]"
reveal_type(ClassA3) # N: Revealed type is "def [Ts1 = Unpack[Tuple[builtins.int, builtins.str]]] () -> __main__.ClassA3[Unpack[Ts1`1 = Unpack[Tuple[builtins.int, builtins.str]]]]"
[builtins fixtures/tuple.pyi]
[case testPEP695TypeParameterDefaultValid]
from typing import Any
class ClassT1[T = int]: ...
class ClassT2[T: float = int]: ...
class ClassT3[T: list[Any] = list[int]]: ...
class ClassT4[T: (int, str) = int]: ...
class ClassP1[**P = []]: ...
class ClassP2[**P = ...]: ...
class ClassP3[**P = [int, str]]: ...
class ClassTs1[*Ts = *tuple[int]]: ...
class ClassTs2[*Ts = *tuple[int, ...]]: ...
[builtins fixtures/tuple.pyi]
[case testPEP695TypeParameterDefaultInvalid]
class ClassT1[T = 2]: ... # E: TypeVar "default" must be a type
class ClassT2[T = [int]]: ... # E: Bracketed expression "[...]" is not valid as a type \
# N: Did you mean "List[...]"? \
# E: TypeVar "default" must be a type
class ClassT3[T: str = int]: ... # E: TypeVar default must be a subtype of the bound type
class ClassT4[T: list[str] = list[int]]: ... # E: TypeVar default must be a subtype of the bound type
class ClassT5[T: (int, str) = bytes]: ... # E: TypeVar default must be one of the constraint types
class ClassT6[T: (int, str) = int | str]: ... # E: TypeVar default must be one of the constraint types
class ClassT7[T: (float, str) = int]: ... # E: TypeVar default must be one of the constraint types
class ClassP1[**P = int]: ... # E: The default argument to ParamSpec must be a list expression, ellipsis, or a ParamSpec
class ClassP2[**P = 2]: ... # E: The default argument to ParamSpec must be a list expression, ellipsis, or a ParamSpec
class ClassP3[**P = (2, int)]: ... # E: The default argument to ParamSpec must be a list expression, ellipsis, or a ParamSpec
class ClassP4[**P = [2, int]]: ... # E: Argument 0 of ParamSpec default must be a type
class ClassTs1[*Ts = 2]: ... # E: The default argument to TypeVarTuple must be an Unpacked tuple
class ClassTs2[*Ts = int]: ... # E: The default argument to TypeVarTuple must be an Unpacked tuple
class ClassTs3[*Ts = tuple[int]]: ... # E: The default argument to TypeVarTuple must be an Unpacked tuple
[builtins fixtures/tuple.pyi]
[case testPEP695TypeParameterDefaultInvalid2]
from typing import overload
def f1[T = 2]() -> None: ... # E: TypeVar "default" must be a type
def f2[T = [int]]() -> None: ... # E: Bracketed expression "[...]" is not valid as a type \
# N: Did you mean "List[...]"? \
# E: TypeVar "default" must be a type
def f3[T: str = int](x: T) -> T: ... # E: TypeVar default must be a subtype of the bound type
def f4[T: list[str] = list[int]](x: T) -> T: ... # E: TypeVar default must be a subtype of the bound type
def f5[T: (int, str) = bytes](x: T) -> T: ... # E: TypeVar default must be one of the constraint types
def f6[T: (int, str) = int | str](x: T) -> T: ... # E: TypeVar default must be one of the constraint types
def f7[T: (float, str) = int](x: T) -> T: ... # E: TypeVar default must be one of the constraint types
def f8[T: str = int]() -> None: ... # TODO check unused TypeVars
@overload
def f9[T: str = int](x: T) -> T: ... # E: TypeVar default must be a subtype of the bound type
@overload
def f9[T: (int, str) = bytes](x: T) -> T: ... # E: TypeVar default must be one of the constraint types
def f9() -> None: ... # type: ignore[misc]
def g1[**P = int]() -> None: ... # E: The default argument to ParamSpec must be a list expression, ellipsis, or a ParamSpec
def g2[**P = 2]() -> None: ... # E: The default argument to ParamSpec must be a list expression, ellipsis, or a ParamSpec
def g3[**P = (2, int)]() -> None: ... # E: The default argument to ParamSpec must be a list expression, ellipsis, or a ParamSpec
def g4[**P = [2, int]]() -> None: ... # E: Argument 0 of ParamSpec default must be a type
def h1[*Ts = 2]() -> None: ... # E: The default argument to TypeVarTuple must be an Unpacked tuple
def h2[*Ts = int]() -> None: ... # E: The default argument to TypeVarTuple must be an Unpacked tuple
def h3[*Ts = tuple[int]]() -> None: ... # E: The default argument to TypeVarTuple must be an Unpacked tuple
[builtins fixtures/tuple.pyi]
[case testPEP695TypeParameterDefaultInvalid3]
from typing import Callable
type TA1[T: str = 1] = list[T] # E: TypeVar "default" must be a type
type TA2[T: str = [int]] = list[T] # E: Bracketed expression "[...]" is not valid as a type \
# N: Did you mean "List[...]"? \
# E: TypeVar "default" must be a type
type TA3[T: str = int] = list[T] # E: TypeVar default must be a subtype of the bound type
type TA4[T: list[str] = list[int]] = list[T] # E: TypeVar default must be a subtype of the bound type
type TA5[T: (int, str) = bytes] = list[T] # E: TypeVar default must be one of the constraint types
type TA6[T: (int, str) = int | str] = list[T] # E: TypeVar default must be one of the constraint types
type TA7[T: (float, str) = int] = list[T] # E: TypeVar default must be one of the constraint types
type TB1[**P = int] = Callable[P, None] # E: The default argument to ParamSpec must be a list expression, ellipsis, or a ParamSpec
type TB2[**P = 2] = Callable[P, None] # E: The default argument to ParamSpec must be a list expression, ellipsis, or a ParamSpec
type TB3[**P = (2, int)] = Callable[P, None] # E: The default argument to ParamSpec must be a list expression, ellipsis, or a ParamSpec
type TB4[**P = [2, int]] = Callable[P, None] # E: Argument 0 of ParamSpec default must be a type
type TC1[*Ts = 2] = tuple[*Ts] # E: The default argument to TypeVarTuple must be an Unpacked tuple
type TC2[*Ts = int] = tuple[*Ts] # E: The default argument to TypeVarTuple must be an Unpacked tuple
type TC3[*Ts = tuple[int]] = tuple[*Ts] # E: The default argument to TypeVarTuple must be an Unpacked tuple
[builtins fixtures/tuple.pyi]
[typing fixtures/typing-full.pyi]
[case testPEP695TypeParameterDefaultFunctions]
from typing import Callable
def callback1(x: str) -> None: ...
def func_a1[T = str](x: int | T) -> T: ...
reveal_type(func_a1(2)) # N: Revealed type is "builtins.str"
reveal_type(func_a1(2.1)) # N: Revealed type is "builtins.float"
def func_a2[T = str](x: int | T) -> list[T]: ...
reveal_type(func_a2(2)) # N: Revealed type is "builtins.list[builtins.str]"
reveal_type(func_a2(2.1)) # N: Revealed type is "builtins.list[builtins.float]"
def func_a3[T: str = str](x: int | T) -> T: ...
reveal_type(func_a3(2)) # N: Revealed type is "builtins.str"
def func_a4[T: (bytes, str) = str](x: int | T) -> T: ...
reveal_type(func_a4(2)) # N: Revealed type is "builtins.str"
def func_b1[**P = [int, str]](x: int | Callable[P, None]) -> Callable[P, None]: ...
reveal_type(func_b1(callback1)) # N: Revealed type is "def (x: builtins.str)"
reveal_type(func_b1(2)) # N: Revealed type is "def (builtins.int, builtins.str)"
def func_c1[*Ts = *tuple[int, str]](x: int | Callable[[*Ts], None]) -> tuple[*Ts]: ...
# reveal_type(func_c1(callback1)) # Revealed type is "Tuple[str]" # TODO
reveal_type(func_c1(2)) # N: Revealed type is "Tuple[builtins.int, builtins.str]"
[builtins fixtures/tuple.pyi]
[case testPEP695TypeParameterDefaultClass1]
# flags: --disallow-any-generics
class ClassA1[T2 = int, T3 = str]: ...
def func_a1(
a: ClassA1,
b: ClassA1[float],
c: ClassA1[float, float],
d: ClassA1[float, float, float], # E: "ClassA1" expects between 0 and 2 type arguments, but 3 given
) -> None:
reveal_type(a) # N: Revealed type is "__main__.ClassA1[builtins.int, builtins.str]"
reveal_type(b) # N: Revealed type is "__main__.ClassA1[builtins.float, builtins.str]"
reveal_type(c) # N: Revealed type is "__main__.ClassA1[builtins.float, builtins.float]"
reveal_type(d) # N: Revealed type is "__main__.ClassA1[builtins.int, builtins.str]"
[builtins fixtures/tuple.pyi]
[case testPEP695TypeParameterDefaultClass2]
# flags: --disallow-any-generics
class ClassB1[**P2 = [int, str], **P3 = ...]: ...
def func_b1(
a: ClassB1,
b: ClassB1[[float]],
c: ClassB1[[float], [float]],
d: ClassB1[[float], [float], [float]], # E: "ClassB1" expects between 0 and 2 type arguments, but 3 given
) -> None:
reveal_type(a) # N: Revealed type is "__main__.ClassB1[[builtins.int, builtins.str], ...]"
reveal_type(b) # N: Revealed type is "__main__.ClassB1[[builtins.float], ...]"
reveal_type(c) # N: Revealed type is "__main__.ClassB1[[builtins.float], [builtins.float]]"
reveal_type(d) # N: Revealed type is "__main__.ClassB1[[builtins.int, builtins.str], ...]"
k = ClassB1()
reveal_type(k) # N: Revealed type is "__main__.ClassB1[[builtins.int, builtins.str], [*Any, **Any]]"
l = ClassB1[[float]]()
reveal_type(l) # N: Revealed type is "__main__.ClassB1[[builtins.float], [*Any, **Any]]"
m = ClassB1[[float], [float]]()
reveal_type(m) # N: Revealed type is "__main__.ClassB1[[builtins.float], [builtins.float]]"
n = ClassB1[[float], [float], [float]]() # E: Type application has too many types (expected between 0 and 2)
reveal_type(n) # N: Revealed type is "Any"
[case testPEP695TypeParameterDefaultClass3]
# flags: --disallow-any-generics
class ClassC1[*Ts = *tuple[int, str]]: ...
def func_c1(
a: ClassC1,
b: ClassC1[float],
) -> None:
# reveal_type(a) # Revealed type is "__main__.ClassC1[builtins.int, builtins.str]" # TODO
reveal_type(b) # N: Revealed type is "__main__.ClassC1[builtins.float]"
k = ClassC1()
reveal_type(k) # N: Revealed type is "__main__.ClassC1[builtins.int, builtins.str]"
l = ClassC1[float]()
reveal_type(l) # N: Revealed type is "__main__.ClassC1[builtins.float]"
[builtins fixtures/tuple.pyi]
[case testPEP695TypeParameterDefaultTypeAlias1]
# flags: --disallow-any-generics
type TA1[T2 = int, T3 = str] = dict[T2, T3]
def func_a1(
a: TA1,
b: TA1[float],
c: TA1[float, float],
d: TA1[float, float, float], # E: Bad number of arguments for type alias, expected between 0 and 2, given 3
) -> None:
reveal_type(a) # N: Revealed type is "builtins.dict[builtins.int, builtins.str]"
reveal_type(b) # N: Revealed type is "builtins.dict[builtins.float, builtins.str]"
reveal_type(c) # N: Revealed type is "builtins.dict[builtins.float, builtins.float]"
reveal_type(d) # N: Revealed type is "builtins.dict[builtins.int, builtins.str]"
[builtins fixtures/dict.pyi]
[typing fixtures/typing-full.pyi]
[case testPEP695TypeParameterDefaultTypeAlias2]
# flags: --disallow-any-generics
class ClassB1[**P2, **P3]: ...
type TB1[**P2 = [int, str], **P3 = ...] = ClassB1[P2, P3]
def func_b1(
a: TB1,
b: TB1[[float]],
c: TB1[[float], [float]],
d: TB1[[float], [float], [float]], # E: Bad number of arguments for type alias, expected between 0 and 2, given 3
) -> None:
reveal_type(a) # N: Revealed type is "__main__.ClassB1[[builtins.int, builtins.str], [*Any, **Any]]"
reveal_type(b) # N: Revealed type is "__main__.ClassB1[[builtins.float], [*Any, **Any]]"
reveal_type(c) # N: Revealed type is "__main__.ClassB1[[builtins.float], [builtins.float]]"
reveal_type(d) # N: Revealed type is "__main__.ClassB1[[builtins.int, builtins.str], [*Any, **Any]]"
[builtins fixtures/tuple.pyi]
[typing fixtures/typing-full.pyi]
[case testPEP695TypeParameterDefaultTypeAlias3]
# flags: --disallow-any-generics
type TC1[*Ts = *tuple[int, str]] = tuple[*Ts]
def func_c1(
a: TC1,
b: TC1[float],
) -> None:
# reveal_type(a) # Revealed type is "Tuple[builtins.int, builtins.str]" # TODO
reveal_type(b) # N: Revealed type is "Tuple[builtins.float]"
[builtins fixtures/tuple.pyi]
[typing fixtures/typing-full.pyi]
[case testPEP695TypeParameterDefaultTypeAlias4]
# flags: --disallow-any-generics
class A[L = int, M = str]: ...
TD1 = A[float]
type TD2 = A[float]
def func_d1(
a: TD1,
b: TD1[float], # E: Bad number of arguments for type alias, expected 0, given 1
c: TD2,
d: TD2[float], # E: Bad number of arguments for type alias, expected 0, given 1
) -> None:
reveal_type(a) # N: Revealed type is "__main__.A[builtins.float, builtins.str]"
reveal_type(b) # N: Revealed type is "__main__.A[builtins.float, builtins.str]"
reveal_type(c) # N: Revealed type is "__main__.A[builtins.float, builtins.str]"
reveal_type(d) # N: Revealed type is "__main__.A[builtins.float, builtins.str]"
[builtins fixtures/tuple.pyi]
[typing fixtures/typing-full.pyi]
[case testTypeVarConstraintsDefaultAliasesInline]
type K = int
type V = int
class A1[T: (str, int) = K]:
x: T
class A2[T: (str, K) = K]:
x: T
class A3[T: (str, K) = V]:
x: T
reveal_type(A1().x) # N: Revealed type is "builtins.int"
reveal_type(A2().x) # N: Revealed type is "builtins.int"
reveal_type(A3().x) # N: Revealed type is "builtins.int"
[builtins fixtures/tuple.pyi]