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from functools import cached_property
from pydantic import BaseModel, computed_field
class Square(BaseModel):
side: float
# mypy limitation, see:
# https://mypy.readthedocs.io/en/stable/error_code_list.html#decorator-preceding-property-not-supported-prop-decorator
@computed_field # type: ignore[prop-decorator]
@property
def area(self) -> float:
return self.side**2
@computed_field # type: ignore[prop-decorator]
@cached_property
def area_cached(self) -> float:
return self.side**2
sq = Square(side=10)
y = 12.4 + sq.area
z = 'x' + sq.area # type: ignore[operator] # pyright: ignore[reportOperatorIssue]
y_cached = 12.4 + sq.area_cached
z_cached = 'x' + sq.area_cached # type: ignore[operator] # pyright: ignore[reportOperatorIssue]
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