1 array = [5,4,3,1] 2  3 for i in array: 4     print(i) 5  6 largest = None 7 smallest = None 8 while True: 9     num = input("Enter a number: ")10     if num == "done" : break
　　　　if len(num) < 1 : break    # check for empty line
11     try:12         num = int(num)13     except:14         print("Invalid input")15         continue16     if largest is None:17         largest = num18     if smallest is None:19         smallest = num20     if num > largest:21         largest = num22     if num < smallest:23         smallest = num24 25 print("Maximum is " + str(largest))26 print("Minimum is " + str(smallest))