python-实现3级菜单（作业课）

 1 #任务：
 2 #显示3级菜单
 3 #1级菜单#显示 3个城市 => 1北京 2上海 3广州
 4 #2级菜单  #显示 选择1 北京 => B1 B2 B3
 5 #2级菜单  #显示 选择2 上海 => S1 S2 S3
 6 #2级菜单  #显示 选择3 广州 => G1 G2 G3
 7 
 8 #3级菜单  #显示 选择B1 => b1_1 b1_2 b1_3
 9 #3级菜单  #显示 选择B2 => b2_1 b2_2 b2_3
10 #3级菜单  #显示 选择B3 => b3_1 b3_2 b3_3
11 
12 #3级菜单  #显示 选择S1 => s1_1 s1_2 s1_3
13 #3级菜单  #显示 选择S2 => s2_1 s2_2 s2_3
14 #3级菜单  #显示 选择S3 => s3_1 s3_2 s3_3
15 
16 #3级菜单  #显示 选择G1 => g1_1 g1_2 g1_3
17 #3级菜单  #显示 选择G2 => g2_1 g2_2 g2_3
18 #3级菜单  #显示 选择G3 => g3_1 g3_2 g3_3
19 
20 #选择Q键 退出程序， 选择R键 返回上一级菜单
21 
22 curPage = 0; #当前页数
23 minPage = 0; #最小页数
24 maxPage = 3; #最大页数
25 showVal = "1.北京 2.上海 3.广州 R.上一页 Q.退出"
26 selectVal = "北京"
27 
28 while True:
29     print("-----------------------------------")
30     print("|"+showVal+"|") #显示具体内容
31     print("-----------------------------------")
32     userVal = input("input your select: ") #用户输入的值
33 
34     if userVal == "Q" or userVal == "q":
35         break
36      
37     if userVal == "1":
38         if curPage == 0:
39             selectVal = "北京"
40             showVal = "   1.B1 2.B2 3.B3 R.上一页 Q.退出  "
41             curPage += 1;
42         elif curPage == 1:
43             if selectVal == "北京":
44                 showVal = "         b1_1 b1_2 b1_3          "
45             elif selectVal == "上海":
46                 showVal = "         s1_1 s1_2 s1_3          "
47             elif selectVal == "广州":
48                 showVal = "         g1_1 g1_2 g1_3          "
49             curPage += 1;
50     elif userVal == "2":
51         if curPage == 0:
52             selectVal = "上海"
53             showVal = "   1.S1 2.S2 3.S3 R.上一页 Q.退出  "
54             curPage += 1;
55         elif curPage == 1:
56             if selectVal == "北京":
57                 showVal = "         b2_1 b2_2 b2_3         "
58             elif selectVal == "上海":
59                 showVal = "         s2_1 s2_2 s2_3         "
60             elif selectVal == "广州":
61                 showVal = "         g2_1 g2_2 g2_3         "
62             curPage += 1;
63     elif userVal == "3":
64         if curPage == 0:
65             selectVal = "广州"
66             showVal = "   1.G1 2.G2 3.G3 R.上一页 Q.退出  "
67             curPage += 1;
68         elif curPage == 1:
69             if selectVal == "北京":
70                 showVal = "         b3_1 b3_2 b3_3         "
71             elif selectVal == "上海":
72                 showVal = "         s3_1 s3_2 s3_3         "
73             elif selectVal == "广州":
74                 showVal = "         g3_1 g3_2 g3_3         "
75             curPage += 1;
76     elif userVal == "r" or userVal == "R":
77         if curPage <= 1:
78             showVal = "1.北京 2.上海 3.广州 R.上一页 Q.退出"
79             curPage = 0
80         else:
81             if selectVal == "北京":
82                 showVal = "         1.B1 2.B2 3.B3         "
83                 curPage -= 1;
84             elif selectVal == "上海":
85                 showVal = "         1.S1 2.S2 3.S3         "
86                 curPage -= 1;
87             elif selectVal == "广州":
88                 showVal = "         1.G1 2.G2 3.G3         "
89                 curPage -= 1;   
90     else:
91         print("->没有找到对应的城市，请重新输入<-")
92 print("GAME OVER")