mypy/test-data/unit/check-safe-datetime.test at 1bd42a6b3b5eefd754d11f35d2e7aaa473b0e578 · python/mypy · GitHub

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[case testDatetimeVsDateComparison]
# flags: --enable-error-code unsafe-datetime
from datetime import date, datetime

dt: datetime
d: date

if dt < d:  # E: Unsupported operand types for < ("datetime" and "date")
    pass

if d > dt:  # E: Unsupported operand types for < ("datetime" and "date")
    pass

if dt == d:
    pass

if dt != d:
    pass

if dt <= d:  # E: Unsupported operand types for <= ("datetime" and "date")
    pass

if dt >= d:  # E: Unsupported operand types for >= ("datetime" and "date")
    pass
[builtins fixtures/classmethod.pyi]
[file datetime.pyi]
class date:
    def __init__(self, year: int, month: int, day: int) -> None: ...
    @classmethod
    def today(cls) -> date: ...
    def __lt__(self, other: date) -> bool: ...
    def __le__(self, other: date) -> bool: ...
    def __gt__(self, other: date) -> bool: ...
    def __ge__(self, other: date) -> bool: ...
    def __eq__(self, other: object) -> bool: ...
    def __ne__(self, other: object) -> bool: ...

class datetime(date):
    def __init__(self, year: int, month: int, day: int, hour: int = 0, minute: int = 0, second: int = 0, microsecond: int = 0) -> None: ...
    @classmethod
    def now(cls) -> datetime: ...
    def __lt__(self, other: datetime) -> bool: ...  # type: ignore[override]
    def __le__(self, other: datetime) -> bool: ...  # type: ignore[override]
    def __gt__(self, other: datetime) -> bool: ...  # type: ignore[override]
    def __ge__(self, other: datetime) -> bool: ...  # type: ignore[override]

[case testDatetimeVsDateComparisonDisabled]
# No flags, so the error should not appear
from datetime import date, datetime

dt: datetime
d: date

if dt < d:
    pass

if d > dt:
    pass
[builtins fixtures/classmethod.pyi]
[file datetime.pyi]
class date:
    def __init__(self, year: int, month: int, day: int) -> None: ...
    @classmethod
    def today(cls) -> date: ...
    def __lt__(self, other: date) -> bool: ...
    def __le__(self, other: date) -> bool: ...
    def __gt__(self, other: date) -> bool: ...
    def __ge__(self, other: date) -> bool: ...
    def __eq__(self, other: object) -> bool: ...
    def __ne__(self, other: object) -> bool: ...

class datetime(date):
    def __init__(self, year: int, month: int, day: int, hour: int = 0, minute: int = 0, second: int = 0, microsecond: int = 0) -> None: ...
    @classmethod
    def now(cls) -> datetime: ...
    def __lt__(self, other: datetime) -> bool: ...  # type: ignore[override]
    def __le__(self, other: datetime) -> bool: ...  # type: ignore[override]
    def __gt__(self, other: datetime) -> bool: ...  # type: ignore[override]
    def __ge__(self, other: datetime) -> bool: ...  # type: ignore[override]

[case testDatetimeVsDateComparisonExplicitTypes]
# flags: --enable-error-code unsafe-datetime
from datetime import date, datetime

def compare_datetime_date(dt: datetime, d: date) -> bool:
    return dt < d  # E: Unsupported operand types for < ("datetime" and "date")
[builtins fixtures/classmethod.pyi]
[file datetime.pyi]
class date:
    def __init__(self, year: int, month: int, day: int) -> None: ...
    @classmethod
    def today(cls) -> date: ...
    def __lt__(self, other: date) -> bool: ...
    def __le__(self, other: date) -> bool: ...
    def __gt__(self, other: date) -> bool: ...
    def __ge__(self, other: date) -> bool: ...
    def __eq__(self, other: object) -> bool: ...
    def __ne__(self, other: object) -> bool: ...

class datetime(date):
    def __init__(self, year: int, month: int, day: int, hour: int = 0, minute: int = 0, second: int = 0, microsecond: int = 0) -> None: ...
    @classmethod
    def now(cls) -> datetime: ...
    def __lt__(self, other: datetime) -> bool: ...  # type: ignore[override]
    def __le__(self, other: datetime) -> bool: ...  # type: ignore[override]
    def __gt__(self, other: datetime) -> bool: ...  # type: ignore[override]
    def __ge__(self, other: datetime) -> bool: ...  # type: ignore[override]

[case testDatetimeComparisonOK]
# flags: --enable-error-code unsafe-datetime
from datetime import date, datetime

dt1: datetime
dt2: datetime
d1: date
d2: date

# datetime vs datetime is safe
if dt1 < dt2:
    pass

# date vs date is now OK since inheritance blocking prevents datetime from being passed as date
if d1 < d2:
    pass
[builtins fixtures/classmethod.pyi]
[file datetime.pyi]
class date:
    def __init__(self, year: int, month: int, day: int) -> None: ...
    @classmethod
    def today(cls) -> date: ...
    def __lt__(self, other: date) -> bool: ...
    def __le__(self, other: date) -> bool: ...
    def __gt__(self, other: date) -> bool: ...
    def __ge__(self, other: date) -> bool: ...
    def __eq__(self, other: object) -> bool: ...
    def __ne__(self, other: object) -> bool: ...

class datetime(date):
    def __init__(self, year: int, month: int, day: int, hour: int = 0, minute: int = 0, second: int = 0, microsecond: int = 0) -> None: ...
    @classmethod
    def now(cls) -> datetime: ...
    def __lt__(self, other: datetime) -> bool: ...  # type: ignore[override]
    def __le__(self, other: datetime) -> bool: ...  # type: ignore[override]
    def __gt__(self, other: datetime) -> bool: ...  # type: ignore[override]
    def __ge__(self, other: datetime) -> bool: ...  # type: ignore[override]

[case testDatetimeVsDateComparisonWithNow]
# flags: --enable-error-code unsafe-datetime
from datetime import date, datetime

if datetime.now() < date.today():  # E: Unsupported operand types for < ("datetime" and "date")
    pass
[builtins fixtures/classmethod.pyi]
[file datetime.pyi]
class date:
    def __init__(self, year: int, month: int, day: int) -> None: ...
    @classmethod
    def today(cls) -> date: ...
    def __lt__(self, other: date) -> bool: ...
    def __le__(self, other: date) -> bool: ...
    def __gt__(self, other: date) -> bool: ...
    def __ge__(self, other: date) -> bool: ...
    def __eq__(self, other: object) -> bool: ...
    def __ne__(self, other: object) -> bool: ...

class datetime(date):
    def __init__(self, year: int, month: int, day: int, hour: int = 0, minute: int = 0, second: int = 0, microsecond: int = 0) -> None: ...
    @classmethod
    def now(cls) -> datetime: ...
    def __lt__(self, other: datetime) -> bool: ...  # type: ignore[override]
    def __le__(self, other: datetime) -> bool: ...  # type: ignore[override]
    def __gt__(self, other: datetime) -> bool: ...  # type: ignore[override]
    def __ge__(self, other: datetime) -> bool: ...  # type: ignore[override]

[case testDatetimeVsDateComparisonInExpression]
# flags: --enable-error-code unsafe-datetime
from datetime import date, datetime

dt: datetime
d: date

result = dt < d  # E: Unsupported operand types for < ("datetime" and "date")
[builtins fixtures/classmethod.pyi]
[file datetime.pyi]
class date:
    def __init__(self, year: int, month: int, day: int) -> None: ...
    @classmethod
    def today(cls) -> date: ...
    def __lt__(self, other: date) -> bool: ...
    def __le__(self, other: date) -> bool: ...
    def __gt__(self, other: date) -> bool: ...
    def __ge__(self, other: date) -> bool: ...
    def __eq__(self, other: object) -> bool: ...
    def __ne__(self, other: object) -> bool: ...

class datetime(date):
    def __init__(self, year: int, month: int, day: int, hour: int = 0, minute: int = 0, second: int = 0, microsecond: int = 0) -> None: ...
    @classmethod
    def now(cls) -> datetime: ...
    def __lt__(self, other: datetime) -> bool: ...  # type: ignore[override]
    def __le__(self, other: datetime) -> bool: ...  # type: ignore[override]
    def __gt__(self, other: datetime) -> bool: ...  # type: ignore[override]
    def __ge__(self, other: datetime) -> bool: ...  # type: ignore[override]

[case testDateVsDateMixedWithDatetime]
# flags: --enable-error-code unsafe-datetime
from datetime import date, datetime

def compare_dates(d1: date, d2: date) -> bool:
    # With inheritance blocking, this is now safe - datetime cannot be passed here
    return d1 < d2

# Example usage that would fail at runtime:
dt = datetime.now()
d = date.today()
# This now errors because datetime is not assignable to date
result = compare_dates(dt, d)  # E: Argument 1 to "compare_dates" has incompatible type "datetime"; expected "date"
[builtins fixtures/classmethod.pyi]
[file datetime.pyi]
class date:
    def __init__(self, year: int, month: int, day: int) -> None: ...
    @classmethod
    def today(cls) -> date: ...
    def __lt__(self, other: date) -> bool: ...
    def __le__(self, other: date) -> bool: ...
    def __gt__(self, other: date) -> bool: ...
    def __ge__(self, other: date) -> bool: ...
    def __eq__(self, other: object) -> bool: ...
    def __ne__(self, other: object) -> bool: ...

class datetime(date):
    def __init__(self, year: int, month: int, day: int, hour: int = 0, minute: int = 0, second: int = 0, microsecond: int = 0) -> None: ...
    @classmethod
    def now(cls) -> datetime: ...
    def __lt__(self, other: datetime) -> bool: ...  # type: ignore[override]
    def __le__(self, other: datetime) -> bool: ...  # type: ignore[override]
    def __gt__(self, other: datetime) -> bool: ...  # type: ignore[override]
    def __ge__(self, other: datetime) -> bool: ...  # type: ignore[override]

[case testInheritanceBlocking]
# flags: --enable-error-code unsafe-datetime
from datetime import date, datetime

# Assignment should be blocked
d: date = datetime.now()  # E: Incompatible types in assignment (expression has type "datetime", variable has type "date")

# Function parameters should be blocked
def accept_date(d: date) -> None:
    pass

accept_date(datetime.now())  # E: Argument 1 to "accept_date" has incompatible type "datetime"; expected "date"

# But date to date should still work
d2: date = date.today()  # OK
accept_date(date.today())  # OK
[builtins fixtures/classmethod.pyi]
[file datetime.pyi]
class date:
    def __init__(self, year: int, month: int, day: int) -> None: ...
    @classmethod
    def today(cls) -> date: ...
    def __lt__(self, other: date) -> bool: ...
    def __le__(self, other: date) -> bool: ...
    def __gt__(self, other: date) -> bool: ...
    def __ge__(self, other: date) -> bool: ...
    def __eq__(self, other: object) -> bool: ...
    def __ne__(self, other: object) -> bool: ...

class datetime(date):
    def __init__(self, year: int, month: int, day: int, hour: int = 0, minute: int = 0, second: int = 0, microsecond: int = 0) -> None: ...
    @classmethod
    def now(cls) -> datetime: ...
    def __lt__(self, other: datetime) -> bool: ...  # type: ignore[override]
    def __le__(self, other: datetime) -> bool: ...  # type: ignore[override]
    def __gt__(self, other: datetime) -> bool: ...  # type: ignore[override]
    def __ge__(self, other: datetime) -> bool: ...  # type: ignore[override]