Type comments should be supported

[smarie]

According to PEP484 one can declare type hints using a "comments" format.

It would be good that create_function supports this way of defining the type hints:

func_signature = """
foo(b,      # type: int
    a = 0,  # type: float
    ):
    # type: (...) -> str
"""

def dummy_handler(*args, **kwargs):
    return "hello"

dynamic_fun = create_function(func_signature, dummy_handler)

assert dynamic_fun.__annotations__ == {'a': float, 'b': int, 'return': str}

[smarie]

We can support the format, but unfortunately we will not be able to provide the correct __annotations__.

Indeed, even inspect.signature is not able to capture this:

def bar(a  # type: int
        ):
    # type: (...) -> float
    return str(a)

s = signature(bar)
assert s.parameters['a'].annotation is int  # <- FAILS !!!
assert s.return_annotation is float         # <- FAILS !!!