Pass nullable arguments that may not exist
Project description
nullability
Pass nullable arguments that may not exist.
Usage
>>> Nullable(1).value
1
>>> print(Nullable(None).value)
None
>>> Nullable.if_not_none(1)
Nullable(value=1)
>>> print(Nullable.if_not_none(None))
None
Usecase example:
>>> from dataclasses import dataclass
>>> from typing import Optional
>>> from nullability import Nullable
>>> @dataclass
... class Foo:
... bar: Optional[int]
... baz: Optional[int]
...
... def update(
... self,
... bar: Optional[Nullable[int]]=None,
... baz: Optional[Nullable[int]]=None,
... ):
... if bar:
... self.bar = bar.value
... if baz:
... self.baz = baz.value
... return self
>>> foo = Foo(bar=1, baz=2)
>>> foo.update(bar=Nullable(3))
Foo(bar=3, baz=2)
>>> foo.update(baz=Nullable(None))
Foo(bar=3, baz=None)
>>> foo.update(bar=Nullable.if_not_none(None))
Foo(bar=3, baz=None)
>>> foo.update(bar=Nullable.if_not_none(4))
Foo(bar=4, baz=None)
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