Function is_sequence_but_not_string

src/marshmallow/utils.py:23–25

Return True if ``obj`` is a sequence that isn't a string.

(obj)

def is_sequence_but_not_string(obj) -> typing.TypeGuard[Sequence]:
    """Return True if ``obj`` is a sequence that isn't a string."""
    return isinstance(obj, Sequence) and not isinstance(obj, (str, bytes))


def is_collection(obj) -> typing.TypeGuard[typing.Iterable]: