def log(descriptor):
    print('Function: ' + descriptor.__name__)
    print(descriptor.__code__.co_varnames)
    
def print_args(func):
    """
    Function to print all args of decorated function
    """

    def wrapper(*func_args, **func_kwargs):
        arg_names = func.__code__.co_varnames[:func.__code__.co_argcount]
        args = func_args[:len(arg_names)]
        defaults = func.__defaults__ or ()
        args = args + defaults[len(defaults) - (func.__code__.co_argcount - len(args)):]
        params = zip(arg_names, args)
        new_arg_list = [list(i) for i in params]
        for key in func_kwargs:
            for param in new_arg_list:
                if key == param[0]:
                    param[1] = func_kwargs[key]
        new_arg_list = [tuple(i) for i in new_arg_list]
        result = func(*func_args, **func_kwargs)
        print(f'{func.__name__} (' + ', '.join('%s = %r' % p for p in new_arg_list) + f'): {result}')

        return result

    return wrapper
    
@print_args
def sum (a, b):
    return a + b
    
print(sum(1, 2))