Python function decorator to check types

arg_checking_decorator

def check_args(*types): 
  def real_decorator(func): 
    def wrapper(*args, **kwargs): 
      for val, typ in zip(args, types): 
        assert isinstance(val, typ), "Value {} is not of expected type {}".format(val, typ) 
      return func(*args, **kwargs) 
    return wrapper 
  return real_decorator 
  
def do_long_computation(name): 
  """ dummy function """ 
  time.sleep(10) return "FruitMart" 
  
@check_args(str, int, int) 
def print_fruit(name, apples, oranges): 
  store_name = do_long_computation(name) fruit = apples + oranges

Taken from this (Python guide)[https://www.airpair.com/python/posts/top-mistakes-python-big-data-analytics]