Check python function signature without a call

问题:

My program derives a sequence args and a mapping kwargs from user input. I want to check that input, and then forward it to a python function f (which is chosen based on user input). In this case, a function signature mismatch between f and [kw]args is an input error; I must distinguish it from possible programming errors within the implementation of f, even though they might both raise TypeError.

So I want to check the signature before attempting the function call. Is there a way to do this other than to manually compare [kw]args to the result of inspect.getargspec (or .getfullargspec or .signature in later python versions)?

Related questions: Is there a way to check a function's signature in Python?

回答1:

The method using inspect is probably the most straightforward way of doing this that exists - it's not something one would normally expect to be doing in Python.

(Typically, allowing end users to call arbitrary functions with arbitrary inputs is not what a programmer wants.)