test-data/unit/semanal-classvar.test

[case testClassVarDef]
from typing import ClassVar
class A:
    x = 1  # type: ClassVar[int]
[out]
MypyFile:1(
  ImportFrom:1(typing, [ClassVar])
  ClassDef:2(
    A
    AssignmentStmt:3(
      NameExpr(x [m])
      IntExpr(1)
      builtins.int)))

[case testClassVarDefInModuleScope]
from typing import ClassVar
x = None  # type: ClassVar[int]
[out]
main:2: error: ClassVar can only be used for assignments in class body

[case testClassVarDefInFuncScope]
from typing import ClassVar
def f() -> None:
    x = None  # type: ClassVar[int]
[out]
main:3: error: ClassVar can only be used for assignments in class body

[case testClassVarDefInMethod]
from typing import ClassVar
class A:
    def f(self) -> None:
        x = None  # type: ClassVar
[out]
main:4: error: ClassVar can only be used for assignments in class body

[case testClassVarTooManyArguments]
from typing import ClassVar
class A:
    x = 1  # type: ClassVar[int, str]
[out]
main:3: error: ClassVar[...] must have at most one type argument

[case testClassVarWithoutArguments]
from typing import ClassVar
class A:
    x = 1  # type: ClassVar
[out]
MypyFile:1(
  ImportFrom:1(typing, [ClassVar])
  ClassDef:2(
    A
    AssignmentStmt:3(
      NameExpr(x [m])
      IntExpr(1)
      Any)))

[case testClassVarWithTypeVar]

from typing import ClassVar, TypeVar
T = TypeVar('T')
class A:
    x = None  # type: ClassVar[T]
[out]
main:5: error: Type variable "__main__.T" is unbound
main:5: note: (Hint: Use "Generic[T]" or "Protocol[T]" base class to bind "T" inside a class)
main:5: note: (Hint: Use "T" in function signature to bind "T" inside a function)

[case testClassVarInFunctionArgs]
from typing import ClassVar
def f(x: str, y: ClassVar) -> None: pass
[out]
main:2: error: ClassVar can only be used for assignments in class body

[case testClassVarInMethodArgs]
from typing import ClassVar
class A:
    def f(x: str, y: ClassVar) -> None: pass
[out]
main:3: error: ClassVar can only be used for assignments in class body

[case testClassVarFunctionRetType]
from typing import ClassVar
def f() -> ClassVar: pass
[out]
main:2: error: ClassVar can only be used for assignments in class body

[case testClassVarMethodRetType]
from typing import ClassVar
class A:
    def f(self) -> ClassVar: pass
[out]
main:3: error: ClassVar can only be used for assignments in class body

[case testMultipleClassVarInFunctionSig]
from typing import ClassVar
def f(x: ClassVar, y: ClassVar) -> ClassVar: pass
[out]
main:2: error: ClassVar can only be used for assignments in class body

[case testClassVarInCallableArgs]
from typing import Callable, ClassVar, Any
f = None  # type: Callable[[int, ClassVar], Any]
[out]
main:2: error: Invalid type: ClassVar nested inside other type

[case testClassVarInCallableRet]
from typing import Callable, ClassVar
f = None  # type: Callable[..., ClassVar]
[out]
main:2: error: Invalid type: ClassVar nested inside other type

[case testClassVarInUnion]
from typing import ClassVar, Union
x = None  # type: Union[ClassVar, str]
[out]
main:2: error: Invalid type: ClassVar nested inside other type

[case testClassVarInUnionAsAttribute]
from typing import ClassVar, Union
class A:
    x = None  # type: Union[ClassVar, str]
[out]
main:3: error: Invalid type: ClassVar nested inside other type

[case testListWithClassVars]
from typing import ClassVar, List
x = []  # type: List[ClassVar]
[builtins fixtures/list.pyi]
[out]
main:2: error: Invalid type: ClassVar nested inside other type

[case testTupleClassVar]
from typing import ClassVar, Tuple
x = None  # type: Tuple[ClassVar, int]
[builtins fixtures/tuple.pyi]
[out]
main:2: error: Invalid type: ClassVar nested inside other type

[case testMultipleLvaluesWithList]
from typing import ClassVar, Tuple
class A:
    [x, y] = None, None  # type: Tuple[ClassVar, ClassVar]
[builtins fixtures/tuple.pyi]
[out]
main:3: error: Invalid type: ClassVar nested inside other type

[case testDeeplyNested]
from typing import Callable, ClassVar, Union
class A: pass
class B:
    x = None  # type: Union[str, Callable[[A, ClassVar], int]]
[out]
main:4: error: Invalid type: ClassVar nested inside other type

[case testClassVarInClassVar]
from typing import ClassVar
class A:
    x = None  # type: ClassVar[ClassVar[int]]
[out]
main:3: error: Invalid type: ClassVar nested inside other type

[case testInsideGeneric]
from typing import ClassVar, Generic, TypeVar
T = TypeVar('T')
class A(Generic[T]): pass
class B:
    x = None  # type: A[ClassVar]
[out]
main:5: error: Invalid type: ClassVar nested inside other type

[case testDefineOnSelf]
from typing import ClassVar
class A:
    def __init__(self) -> None:
        self.x = None  # type: ClassVar
[out]
main:4: error: ClassVar can only be used for assignments in class body

[case testForIndex]
from typing import ClassVar
for i in []:  # type: ClassVar
    pass
[out]
main:2: error: ClassVar can only be used for assignments in class body

[case testForIndexInClassBody]
from typing import ClassVar
class A:
    for i in []:  # type: ClassVar
        pass
[out]
main:3: error: ClassVar can only be used for assignments in class body

[case testWithStmt]
from typing import ClassVar
class A: pass
with A() as x:  # type: ClassVar
    pass
[out]
main:3: error: ClassVar can only be used for assignments in class body

[case testWithStmtInClassBody]
from typing import ClassVar
class A: pass
class B:
    with A() as x:  # type: ClassVar
        pass
[out]
main:4: error: ClassVar can only be used for assignments in class body

[case testClassVarWithTypeVariable]
from typing import ClassVar, TypeVar, Generic, List

T = TypeVar('T')

class Some(Generic[T]):
    error: ClassVar[T]  # E: ClassVar cannot contain type variables
    nested: ClassVar[List[List[T]]]  # E: ClassVar cannot contain type variables
    ok: ClassVar[int]
[out]