Python循环三级菜单

选择城市》选择区》选择区内的公司等

三级菜单循环

# coding=utf-8
# Version:python3.6
# Name:shiwei
data = {
'北京': {
'海淀': {
'五道口': {
'soho': {},
'网易': {},
'google': {},
},
'中关村': {
'爱奇艺': {},
'汽车之家': {},
'youku': {},
},
'上地': {
'百度': {},
}
},
'昌平': {
'沙河': {
'老男孩': {},
'北航': {},
}
},
'朝阳': {},
'东城': {},
},
'上海': {
'宝山': {
'大场': {},
'上海大学': {},
},
'松江': {
'佘山': {},
'欢乐谷': {},
'月亮湖': {},
}
},
'杭州': {}
}

exit_flag = False

while not exit_flag:
for i in data:
print(i)
choice = input('选择进入1>>')
if choice in data:
while not exit_flag:
for i2 in data[choice]:
print('\t', i2)
choice2 = input('选择进入2>>')
if choice2 in data[choice]:
while not exit_flag:
for i3 in data[choice][choice2]:
print('\t\t', i3)
choice3 = input('选择进入3>>')
if choice3 in data[choice][choice2]:
for i4 in data[choice][choice2][choice3]:
print('\t\t\t', i4)
choice4 = input('最后一层， 按b返回>>')
if choice4 == 'b':
pass  # 或者continue
elif choice3 == 'b':
break
elif choice3 == 'q':
exit_flag = True
else:
print('没有下级菜单了!按b 返回上级把！')
continue

elif choice2 == 'b':
break
elif choice2 == 'q':
exit_flag = True
else:
print('没有下级菜单了!按b 返回上级把！')
continue
elif choice == 'q':
exit_flag = True
else:
print('Byebye!')