The different uses of Python type hints

Re:The different uses of Python type hints by throw_a_grenade on Saturday April 15, 2023 @08:58PM (#35586236)

Dataclasses, like typing.NamedTuple, do not care about type hints:

    >>> @dataclasses.dataclass
    ... class D:
    ...   x: int
    ...
    >>> D('a')
    D(x='a')

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Re:The different uses of Python type hints by FreakLegion on Saturday April 15, 2023 @09:29PM (#35586415)

Dataclasses do care about type hints in some cases, for example when determining what counts as a field.

    @dataclass
    class A:
        a: int = 0
        b = 1

    >>> A(a=1, b=2)
    TypeError: __init__() got an unexpected keyword argument 'b'

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Re:The different uses of Python type hints by jselysianeagle on Saturday April 15, 2023 @09:24PM (#35586394)

The idea with type hints in Python though is that they’re meant to be checked using some static analysis tool like mypy/pyright/etc. The runtime behavior for the most part remains unchanged in the sense that the Python interpreter won’t enforce the types in cases such as the one you’ve provided.

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Re:The different uses of Python type hints by eirki on Sunday April 16, 2023 @05:24AM (#35588474)

The only exceptions I can think of is https://docs.python.org/3/library/typing.html#typing.ClassVa...

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