1def check_input_arguments(args, types):
 2    for arg in args:
 3        if not isinstance(arg, types):
 4            print('Invalid input arguments, expected {}!'.format(', '.join(str(type) for type in types)))
 5            return False
 6    return True
 7        
 8
 9def type_check(val):
10    """Check the types of the input and output of a function."""
11
12    def wrapper(*types):
13        def decorator(func):
14            def check_types(*args, **kwargs):
15                if isinstance(val, str):
16                    if val == 'in':
17                        check_input_arguments(args,types)
18
19                    res = func(*args, **kwargs)
20
21                    if val == 'out':
22                        if not isinstance(res, types):
23                            print('Invalid output value, expected {}!'.format(', '.join(str(type) for type in types)))
24                
25                return res
26            return check_types
27        return decorator
28    return wrapper