python写菜单选择 python制作选项菜单

一:制作要求

1.三级菜单

2.可依次选择进入各子菜单

3.所需新知识点:字典,列表

*本文通过三种方法完成,第一种:只使用循环,第二种:使用列表,第三种:使用字典

二:FlowChart流程图

与上图对应,实现方式图解:

while用来判断输入的数据和允许输入数据中的哪一项匹配,if来进行判断是否退出本次循环,

三:具体实现代码:

1.没有使用列表字典

1 #三级菜单 输入都是用一个变量 0120使用字典,列表
2
3 #思路:while
4 #定义一级菜单
5 msg='''
6 请输入你要进行的操作前面的索引(1,2,3,b):7
8 1.北京9 2.上海10 3.香港11 b.退出12 '''
13 #定义二级菜单
14 msg_1='''
15 1.朝阳区16 2.西城区17 3.海淀区18 b.返回上一级19 '''
20 msg_2_2='''
21 1.西城区_A22 2.西城区_B23 3.西城区_C24 b.返回上一级25 '''
26 #定义三级菜单
27 msg_2_1='''
28 1.朝阳区_A29 2.朝阳区_B30 3.朝阳区_C31 b.返回上一级32 '''
33 whileTrue:34 #输出一级菜单:
35 print(msg)36 select_input=input("请输入你的选择:")37 #选项一
38 while select_input== "1":39 print(msg_1)40 select_input_1 = input("请输入你的选择:")41 while select_input_1 == "1":42 print(msg_2_1)43 select_input_2 = input("请输入你的选择:")44 if select_input_2=="b":45 break
46 while select_input_1 == "2":47 print(msg_2_2)48 select_input_2 = input("请输入你的选择:")49 if select_input_2 == "b":50 break
51 while select_input_1 == "3":52 print(msg_2_2)53 select_input_2 = input("请输入你的选择:")54 if select_input_2 == "b":55 break
56 if select_input_1== "b":57 break
58 #选项二
59 while select_input == "2":60 print(msg_1)61 select_input_1 = input("请输入你的选择:")62 while select_input_1 == "1":63 print(msg_2_1)64 select_input_2 = input("请输入你的选择:")65 if select_input_2 == "b":66 break
67 while select_input_1 == "2":68 print(msg_2_2)69 select_input_2 = input("请输入你的选择:")70 if select_input_2 == "b":71 break
72 while select_input_1 == "3":73 print(msg_2_2)74 select_input_2 = input("请输入你的选择:")75 if select_input_2 == "b":76 break
77 if select_input_1 == "b":78 break
79 #选项三
80 while select_input == "3":81 print(msg_1)82 select_input_1 = input("请输入你的选择:")83 while select_input_1 == 1:84 print(msg_2_1)85 select_input_2 = input("请输入你的选择:")86 if select_input_2 == "b":87 break
88 while select_input_1 == "2":89 print(msg_2_2)90 select_input_2 = input("请输入你的选择:")91 if select_input_2 == "b":92 break
93 while select_input_1 == "3":94 print(msg_2_2)95 select_input_2 = input("请输入你的选择:")96 if select_input_2 == "b":97 break
98 if select_input_1 == "b":99 break
100 #选项四
101 if select_input=="b":102 break
103 print("本次使用结束!")

View Code

2.使用列表

1 #三级菜单 输入都是用一个变量 0120使用字典,列表
2
3 #思路:while
4 #通过定义列表进行选项存储
5 list=["北京","上海","香港","退出"]6 list_1=["朝阳区","西城区","海淀区","返回上一级"]7 list_1_1=["朝阳区_A","朝阳区_B","朝阳区_C","返回上一级"]8 list_1_2=["西城区_A","西城区_B","西城区_C","返回上一级"]9 whileTrue:10 #输出一级菜单:
11 for i inlist:12 print("\n%s: %s"%(list.index(i)+1,i))13 select_input = input("请输入你的选择:")14 #选项一
15 while select_input == "1":16 for i inlist_1:17 print("\n%s: %s" % (list_1.index(i) + 1, i))18 select_input_1 = input("请输入你的选择:")19 while select_input_1 == "1":20 for i inlist_1_1:21 print("\n%s: %s" % (list_1_1.index(i) + 1, i))22 select_input_2 = input("请输入你的选择:")23 if select_input_2 == "4":24 break
25 while select_input_1 == "2":26 for i inlist_1_2:27 print("\n%s: %s" % (list_1_2.index(i) + 1, i))28 select_input_2 = input("请输入你的选择:")29 if select_input_2 == "4":30 break
31 while select_input_1 == "3":32 for i inlist_1_2:33 print("\n%s: %s" % (list_1_2.index(i) + 1, i))34 select_input_2 = input("请输入你的选择:")35 if select_input_2 == "4":36 break
37 if select_input_1 == "4":38 break
39 #选项二
40 while select_input == "2":41 for i inlist_1:42 print("\n%s: %s" % (list_1.index(i) + 1, i))43 select_input_1 = input("请输入你的选择:")44 while select_input_1 == "1":45 for i inlist_1_2:46 print("\n%s: %s" % (list_1_2.index(i) + 1, i))47 select_input_2 = input("请输入你的选择:")48 if select_input_2 == "4":49 break
50 while select_input_1 == "2":51 for i inlist_1_2:52 print("\n%s: %s" % (list_1_2.index(i) + 1, i))53 select_input_2 = input("请输入你的选择:")54 if select_input_2 == "4":55 break
56 while select_input_1 == "3":57 for i inlist_1_2:58 print("\n%s: %s" % (list_1_2.index(i) + 1, i))59 select_input_2 = input("请输入你的选择:")60 if select_input_2 == "4":61 break
62 if select_input_1 == "4":63 break
64 #选项三
65 while select_input == "3":66 for i inlist_1:67 print("\n%s: %s" % (list_1.index(i) + 1, i))68 select_input_1 = input("请输入你的选择:")69 while select_input_1 == 1:70 for i inlist_1_2:71 print("\n%s: %s" % (list_1_2.index(i) + 1, i))72 select_input_2 = input("请输入你的选择:")73 if select_input_2 == "4":74 break
75 while select_input_1 == "2":76 for i inlist_1_2:77 print("\n%s: %s" % (list_1_2.index(i) + 1, i))78 select_input_2 = input("请输入你的选择:")79 if select_input_2 == "4":80 break
81 while select_input_1 == "3":82 for i inlist_1_2:83 print("\n%s: %s" % (list_1_2.index(i) + 1, i))84 select_input_2 = input("请输入你的选择:")85 if select_input_2 == "4":86 break
87 if select_input_1 == "4":88 break
89 #选项四
90 if select_input == "4":91 break
92 print("本次使用结束!")

View Code

使用列表运行效果和第一种方法类似,只不过把返回的值改成了4,

3.使用字典

#三级菜单 输入都是用一个变量 0120使用字典,列表
#思路:while#通过字典进行选项存储
dic={"1.北京":{"1.朝阳区":["朝阳区_A","朝阳区_B","朝阳区_C","返回上一级"],"2.西城区":["西城区_A","西城区_B","西城区_C","返回上一级"],"3.海淀区":[],"4.返回上一级":[]
},"2.上海":{},"3.香港":{},"b.退出":{}
}whileTrue:#输出一级菜单:
print(dic.keys())
select_input= input("请输入你的选择:")#选项一
while select_input == "1":print(dic["1.北京"].keys())
select_input_1= input("请输入你的选择:")while select_input_1 == "1":print(dic["1.北京"]["1.朝阳区"])
select_input_2= input("请输入你的选择:")if select_input_2 == "b":break
while select_input_1 == "2":print(dic["1.北京"]["1.朝阳区"])
select_input_2= input("请输入你的选择:")if select_input_2 == "b":break
while select_input_1 == "3":print(dic["1.北京"]["1.朝阳区"])
select_input_2= input("请输入你的选择:")if select_input_2 == "b":break
if select_input_1 == "b":break
#选项二
while select_input == "2":print(dic["1.北京"].keys)
select_input_1= input("请输入你的选择:")while select_input_1 == "1":print(dic["1.北京"]["1.朝阳区"])
select_input_2= input("请输入你的选择:")if select_input_2 == "b":break
while select_input_1 == "2":print(dic["1.北京"]["1.朝阳区"])
select_input_2= input("请输入你的选择:")if select_input_2 == "b":break
while select_input_1 == "3":print(dic["1.北京"]["1.朝阳区"])
select_input_2= input("请输入你的选择:")if select_input_2 == "b":break
if select_input_1 == "b":break
#选项三
while select_input == "3":print(dic["1.北京"].keys)
select_input_1= input("请输入你的选择:")while select_input_1 == 1:print(dic["1.北京"]["1.朝阳区"])
select_input_2= input("请输入你的选择:")if select_input_2 == "b":break
while select_input_1 == "2":print(dic["1.北京"]["1.朝阳区"])
select_input_2= input("请输入你的选择:")if select_input_2 == "b":break
while select_input_1 == "3":print(dic["1.北京"]["1.朝阳区"])
select_input_2= input("请输入你的选择:")if select_input_2 == "b":break
if select_input_1 == "b":break
#选项四
if select_input == "b":break
print("本次使用结束!")

View Code

四:运行效果截图(第一种方法):

五:注意事项

1.Python虽然简单,但是一定要熟练掌握格式,有的时候差一个空格都会出错而且还不容易排除错误.

2.关于语句:

select_input=b
while int(select_input)==1

运行报错:ValueError: invalid literal for int() with base 10: 'b',

语法错误

出错原因:Python3.0以后的版本不能进行字符串转换类型之后与数字之间的比较与判断

所以改成:select_input=="1"