argparse -> function call

argparse_call.py

# Please note this function is a sketch and there will be (plenty of) edge cases
# where it won't do the right thing.

def whitelist_dict(d, whitelist):
    """
    Neat function to extract arguments from a dict, d, that are acceptable for
    calling a target function.
    
    `whitelist` can be either a set of acceptable parameter names, or a callable,
    which will have its parameters inspected.
    
    Use it like this:
    
    >>> options = argument_parser.parse_args()
    >>> run(**whitelist_dict(vars(options), run))
    """
    if callable(whitelist):
        sig = signature(whitelist)
        if any(param.kind == Parameter.VAR_KEYWORD for param in sig.parameters.values()):
            whitelist = None
        else:
            whitelist = [
                k for k, v in sig.parameters.items() if v.kind in (
                    Parameter.POSITIONAL_OR_KEYWORD,
                    Parameter.KEYWORD_ONLY,
                )
            ]
    return {
        k: v for k, v in d.items() if whitelist is None or k in whitelist
    }