Python中的循环语句

 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         continue
16     if largest is None:
17         largest = num
18     if smallest is None:
19         smallest = num
20     if num > largest:
21         largest = num
22     if num < smallest:
23         smallest = num
24 
25 print("Maximum is " + str(largest))
26 print("Minimum is " + str(smallest))