Python Callable Protocols for complex Callable typing
If you need to add typing to a complex Callable, with, say, parameter names etc., there are Callback Protocols.
# NB "self" is included!
class Combiner(Protocol):
def __call__(self, *vals: bytes, maxlen: Optional[int] = None) -> list[bytes]: ...
def batch_proc(data: Iterable[bytes], cb_results: Combiner) -> bytes:
for item in data:
Python 3.7 needs typing_extensions, 3.8+ support it natively.
See also: python typing signature (typing.Callable) for function with kwargs - Stack Overflow
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