1def type_check(verification_mode): 
 2    def decorator(*argument_types):
 3        def wrapper(function):
 4            def validator(*args, **kwargs):
 5                if verification_mode == "in":
 6                    invalid_input = False
 7                    for arg in args:
 8                        if not isinstance(arg, argument_types):
 9                            invalid_input = True
10                            break
11                    if invalid_input:
12                        print("Invalid input arguments, expected {}!".format(', '.join(map(str, argument_types))))
13                
14                result = function(*args, **kwargs)
15
16                if verification_mode == "out":
17                    if not isinstance(result, argument_types):
18                        print("Invalid output value, expected {}!".format(', '.join(map(str, argument_types))))
19                
20                return result
21            return validator
22        return wrapper
23    return decorator