ex33 while 循环

 1 #-*- coding: UTF-8 -*-
 2 #下面是最初的函数
 3 i = 0
 4 numbers = []
 5 
 6 while i < 6:
 7     print "At the top i is %d" % i
 8     numbers.append(i)
 9     
10     i = i + 1
11     print "Numbers now:", numbers
12     print "At the bottom i is %d" % i 
13 
14     
15 print "The numbers."
16 
17 for num in numbers:
18     print num
19     
20 #将while循环改成了一个函数    
21 def while_1(j,step):
22     i = 0
23     numbers = []
24     while i < j:
25         print "At the top i is %d " % i 
26     
27         numbers.append(i)
28     
29         i = i + step
30         print "Numbers now:", numbers
31         print "At the bottom i is %d" % i 
32     
33 result = while_1(20,1)
34 
35 
36 #将函数中的while用for循环和range来代替。
37 def for_range(j,step):
38     i = 0
39     numbers = []
40     for i in range(0,j):
41         print "At the top i is %d " % i 
42     
43         numbers.append(i)
44     
45         i = i + step#如果不去掉这一步，就只是在最后打印 at the bottom的时候加了一次，在循环中是不受影响的。
46         print "Numbers now:", numbers
47         print "At the bottom i is %d" % i
48 result = for_range(20,2)