mypy/test-data/unit/check-type-promotion.test at 6f2b0cfbbdc9b53eab3f376d2c0ba711d2a6f108 · python/mypy · GitHub

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-- Test cases for type promotion (e.g. int -> float).


[case testPromoteIntToFloat]
def f(x: float) -> None: pass
f(1)
[builtins fixtures/primitives.pyi]

[case testCantPromoteFloatToInt]
def f(x: int) -> None: pass
f(1.1) # E: Argument 1 to "f" has incompatible type "float"; expected "int"
[builtins fixtures/primitives.pyi]

[case testPromoteFloatToComplex]
def f(x: complex) -> None: pass
f(1)
[builtins fixtures/primitives.pyi]

[case testPromoteIntToComplex]
def f(x: complex) -> None: pass
f(1)
[builtins fixtures/primitives.pyi]

[case testPromoteBytearrayToByte]
# flags: --no-strict-bytes
def f(x: bytes) -> None: pass
f(bytearray(b''))
[builtins fixtures/primitives.pyi]

[case testPromoteMemoryviewToBytes]
# flags: --no-strict-bytes
def f(x: bytes) -> None: pass
f(memoryview(b''))
[builtins fixtures/primitives.pyi]

[case testDisableBytearrayMemoryviewPromotion]
# flags: --strict-bytes --strict-equality --warn-unreachable
def f(x: bytes) -> None: ...
f(bytearray(b"asdf"))  # E: Argument 1 to "f" has incompatible type "bytearray"; expected "bytes"
f(memoryview(b"asdf"))  # E: Argument 1 to "f" has incompatible type "memoryview"; expected "bytes"
ba = bytearray(b"")
if ba == b"":
    f(ba)  # E: Argument 1 to "f" has incompatible type "bytearray"; expected "bytes"
if b"" == ba:
    f(ba)  # E: Argument 1 to "f" has incompatible type "bytearray"; expected "bytes"
if ba == bytes():
    f(ba)  # E: Argument 1 to "f" has incompatible type "bytearray"; expected "bytes"
if bytes() == ba:
    f(ba)  # E: Argument 1 to "f" has incompatible type "bytearray"; expected "bytes"
[builtins fixtures/primitives.pyi]

[case testEnableBytearrayMemoryviewPromotion]
# flags: --no-strict-bytes --strict-equality --warn-unreachable
def f(x: bytes) -> None: ...
f(bytearray(b"asdf"))
f(memoryview(b"asdf"))
ba = bytearray(b"")
if ba == b"":
    f(ba)
if b"" == ba:
    f(ba)
if ba == bytes():
    f(ba)
if bytes() == ba:
    f(ba)
[builtins fixtures/primitives.pyi]

[case testDisableBytearrayMemoryviewPromotionStrictEquality]
# flags: --strict-equality --strict-bytes
def f(x: bytes, y: bytearray, z: memoryview) -> None:
    x == y
    y == z
    x == z
    97 in x
    97 in y
    97 in z
    x in y
    x in z
[builtins fixtures/primitives.pyi]

[case testEnableBytearrayMemoryviewPromotionStrictEquality]
# flags: --strict-equality --no-strict-bytes
def f(x: bytes, y: bytearray, z: memoryview) -> None:
    x == y
    y == z
    x == z
    97 in x
    97 in y
    97 in z
    x in y
    x in z
[builtins fixtures/primitives.pyi]

[case testNarrowingDownFromPromoteTargetType]
y = 0.0
y = 1
y() # E: "int" not callable
[builtins fixtures/primitives.pyi]

[case testNarrowingDownFromPromoteTargetType2]
y = 0.0
y = 1
y.x # E: "int" has no attribute "x"
[builtins fixtures/primitives.pyi]

[case testTypePromotionsDontInterfereWithProtocols]
from typing import TypeVar, Union, Protocol

class SupportsFloat(Protocol):
    def __float__(self) -> float: pass

T = TypeVar('T')
def f(x: Union[SupportsFloat, T]) -> Union[SupportsFloat, T]: pass
f(0)  # should not crash
[builtins fixtures/primitives.pyi]
[out]

[case testIntersectionUsingPromotion1]
# flags: --warn-unreachable
from typing import Union

x: complex = 1
reveal_type(x)  # N: Revealed type is "builtins.complex"
if isinstance(x, int):
    reveal_type(x)  # N: Revealed type is "builtins.int"
else:
    reveal_type(x)  # N: Revealed type is "builtins.complex"
reveal_type(x)  # N: Revealed type is "builtins.complex"

y: Union[int, float]
if isinstance(y, float):
    reveal_type(y)  # N: Revealed type is "builtins.float"
else:
    reveal_type(y)  # N: Revealed type is "builtins.int"

reveal_type(y)  # N: Revealed type is "builtins.int | builtins.float"

if isinstance(y, int):
    reveal_type(y)  # N: Revealed type is "builtins.int"
else:
    reveal_type(y)  # N: Revealed type is "builtins.float"
[builtins fixtures/primitives.pyi]

[case testIntersectionUsingPromotion2]
# flags: --warn-unreachable
x: complex = 1
reveal_type(x)  # N: Revealed type is "builtins.complex"
if isinstance(x, (int, float)):
    reveal_type(x)  # N: Revealed type is "builtins.int | builtins.float"
else:
    reveal_type(x)  # N: Revealed type is "builtins.complex"

# Note we make type precise, since type promotions are involved
reveal_type(x)  # N: Revealed type is "builtins.complex"
[builtins fixtures/primitives.pyi]

[case testIntersectionUsingPromotion3]
# flags: --warn-unreachable
x: object
if isinstance(x, int) and isinstance(x, complex):
    reveal_type(x)  # N: Revealed type is "builtins.int"
if isinstance(x, complex) and isinstance(x, int):
    reveal_type(x)  # N: Revealed type is "builtins.int"
[builtins fixtures/primitives.pyi]

[case testIntersectionUsingPromotion4]
# flags: --warn-unreachable
x: object
if isinstance(x, int):
    if isinstance(x, complex):
        reveal_type(x)  # N: Revealed type is "builtins.int"
    else:
        reveal_type(x)  # N: Revealed type is "builtins.int"
if isinstance(x, complex):
    if isinstance(x, int):
        reveal_type(x)  # N: Revealed type is "builtins.int"
    else:
        reveal_type(x)  # N: Revealed type is "builtins.complex"
[builtins fixtures/primitives.pyi]

[case testIntersectionUsingPromotion5]
# flags: --warn-unreachable
from typing import Union

x: Union[float, complex]
if isinstance(x, int):
    reveal_type(x)  # N: Revealed type is "builtins.int"
else:
    reveal_type(x)  # N: Revealed type is "builtins.float | builtins.complex"
reveal_type(x)  # N: Revealed type is "builtins.float | builtins.complex"
[builtins fixtures/primitives.pyi]

[case testIntersectionUsingPromotion6]
# flags: --warn-unreachable
from typing import Union

x: Union[str, complex]
if isinstance(x, int):
    reveal_type(x)  # N: Revealed type is "builtins.int"
else:
    reveal_type(x)  # N: Revealed type is "builtins.str | builtins.complex"
reveal_type(x)  # N: Revealed type is "builtins.str | builtins.complex"
[builtins fixtures/primitives.pyi]

[case testIntersectionUsingPromotion7]
# flags: --warn-unreachable
from typing import Union

x: Union[int, float, complex]
if isinstance(x, int):
    reveal_type(x)  # N: Revealed type is "builtins.int"
else:
    reveal_type(x)  # N: Revealed type is "builtins.float | builtins.complex"

reveal_type(x)  # N: Revealed type is "builtins.int | builtins.float | builtins.complex"

if isinstance(x, float):
    reveal_type(x)  # N: Revealed type is "builtins.float"
else:
    reveal_type(x)  # N: Revealed type is "builtins.int | builtins.complex"

reveal_type(x)  # N: Revealed type is "builtins.int | builtins.float | builtins.complex"

if isinstance(x, complex):
    reveal_type(x)  # N: Revealed type is "builtins.complex"
else:
    reveal_type(x)  # N: Revealed type is "builtins.int | builtins.float"

reveal_type(x)  # N: Revealed type is "builtins.int | builtins.float | builtins.complex"
[builtins fixtures/primitives.pyi]

[case testIntersectionUsingPromotion8]
# flags: --warn-unreachable
from typing import Union

x: Union[int, float, complex]
if isinstance(x, (int, float)):
    reveal_type(x)  # N: Revealed type is "builtins.int | builtins.float"
else:
    reveal_type(x)  # N: Revealed type is "builtins.complex"
if isinstance(x, (int, complex)):
    reveal_type(x)  # N: Revealed type is "builtins.int | builtins.complex"
else:
    reveal_type(x)  # N: Revealed type is "builtins.float"
if isinstance(x, (float, complex)):
    reveal_type(x)  # N: Revealed type is "builtins.float | builtins.complex"
else:
    reveal_type(x)  # N: Revealed type is "builtins.int"
[builtins fixtures/primitives.pyi]

[case testRejectPromotionsForProtocols]
from typing import Protocol

class H(Protocol):
    def hex(self, /) -> str: ...

f: H = 1.0
o: H = object()  # E: Incompatible types in assignment (expression has type "object", variable has type "H")
c: H = 1j   # E: Incompatible types in assignment (expression has type "complex", variable has type "H")
i: H = 1  # E: Incompatible types in assignment (expression has type "int", variable has type "H")
b: H = False  # E: Incompatible types in assignment (expression has type "bool", variable has type "H")

class N(float): ...
n: H = N()
[builtins fixtures/primitives.pyi]