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-- Conditional type checks.
[case testSimpleIsinstance]
x: object
n: int
s: str
if int():
n = x # E: Incompatible types in assignment (expression has type "object", variable has type "int")
if isinstance(x, int):
n = x
s = x # E: Incompatible types in assignment (expression has type "int", variable has type "str")
if int():
n = x # E: Incompatible types in assignment (expression has type "object", variable has type "int")
[builtins fixtures/isinstance.pyi]
[case testSimpleIsinstance2]
import typing
def f(x: object, n: int, s: str) -> None:
if int():
n = x # E: Incompatible types in assignment (expression has type "object", variable has type "int")
if isinstance(x, int):
n = x
s = x # E: Incompatible types in assignment (expression has type "int", variable has type "str")
n = x # E: Incompatible types in assignment (expression has type "object", variable has type "int")
[builtins fixtures/isinstance.pyi]
[out]
[case testSimpleIsinstance3]
class A:
x = None # type: object
n = None # type: int
s = None # type: str
if int():
n = x # E: Incompatible types in assignment (expression has type "object", variable has type "int")
if isinstance(x, int):
n = x
s = x # E: Incompatible types in assignment (expression has type "int", variable has type "str")
else:
n = x # E: Incompatible types in assignment (expression has type "object", variable has type "int")
[builtins fixtures/isinstance.pyi]
[out]
[case testMultipleIsinstanceTests]
import typing
class A: pass
class B(A): pass
def f(x: object, a: A, b: B, c: int) -> None:
if isinstance(x, A):
if isinstance(x, B):
b = x
x = a
a = x
c = x # E: Incompatible types in assignment (expression has type "A", variable has type "int")
[builtins fixtures/isinstance.pyi]
[out]
[case testMultipleIsinstanceTests2]
import typing
class A: pass
class B(A): pass
def f(x: object, y: object, n: int, s: str) -> None:
if isinstance(x, int):
if isinstance(y, str):
n = x
s = y
s = x # E: Incompatible types in assignment (expression has type "int", variable has type "str")
n = y # E: Incompatible types in assignment (expression has type "str", variable has type "int")
s = y # E: Incompatible types in assignment (expression has type "object", variable has type "str")
n = y # E: Incompatible types in assignment (expression has type "object", variable has type "int")
n = x
[builtins fixtures/isinstance.pyi]
[out]
[case testIsinstanceAndElif]
import typing
def f(x: object, n: int, s: str) -> None:
if int():
n = x # E: Incompatible types in assignment (expression has type "object", variable has type "int")
if isinstance(x, int):
n = x
s = x # E: Incompatible types in assignment (expression has type "int", variable has type "str")
elif isinstance(x, str):
s = x
n = x # E: Incompatible types in assignment (expression has type "str", variable has type "int")
else:
n = x # E: Incompatible types in assignment (expression has type "object", variable has type "int")
s = x # E: Incompatible types in assignment (expression has type "object", variable has type "str")
n = x # E: Incompatible types in assignment (expression has type "object", variable has type "int")
[builtins fixtures/isinstance.pyi]
[out]
[case testIsinstanceAndAnyType]
from typing import Any
def f(x: Any, n: int, s: str) -> None:
if int():
s = x
if isinstance(x, int):
n = x
s = x # E: Incompatible types in assignment (expression has type "int", variable has type "str")
s = x
[builtins fixtures/isinstance.pyi]
[out]
[case testIsinstanceAndGenericType]
from typing import TypeVar, Generic
T = TypeVar('T')
class C(Generic[T]):
def f(self, x: T) -> None: pass
def f(x: object) -> None:
if isinstance(x, C):
x.f(1)
x.f('')
x.g() # E: "C[Any]" has no attribute "g"
x.g() # E: "object" has no attribute "g"
[builtins fixtures/isinstance.pyi]
[out]
|
