Python Optional equivalent for Sequence

Question

Assuming T = TypeVar('T')
Optional[T] hint is interpreted to Union[T, None].
Is there any equivalent for Sequence hint, so that it will be interpreted to Union[T, Sequence[T]]?

@AzatIbrakov: There are some built-in functions that behave like this, so it's not that weird. See min/max (which is either one iterable argument or more than one scalar argument), or str.endswith's ability to take a single str or a tuple of str. — ShadowRanger
– ShadowRanger, Commented May 22, 2020 at 14:52

deceze · Accepted Answer · 2020-05-22 14:09:21Z

1

You can define such a type like this:

T = TypeVar('T')
MaybeSequence = Union[T, Sequence[T]]

foo: MaybeSequence[str]

answered May 22, 2020 at 14:09

deceze♦

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Andrey Over a year ago

Alias hint may be an option. Thanks.

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