Arg Sink decorator

arg_sink.py

# When calling functions, remove unused arguments
# Useful for framework callbacks
 
def args_sink(f):
    import inspect
    dst_args = inspect.getargspec(f)
    args = set(dst_args.args)
    @wraps(f)
    def wrapper(*a, **kw):
        nkw = deepcopy(kw)
        if not dst_args.varargs:
            a = a[:len(dst_args.args)]
        if not dst_args.keywords:
            for k in kw:
                if k not in args:
                    del nkw[k]
        return f(*a, **nkw)
    return wrapper
    
# Example:
t = lambda: 0
args_sink(t)(a=1, b=2)