三级菜单

#!/usr/bin/env python
#author:lei
import collections
Break = ['b']
dic = {
    '北京':
        {'海淀区':['中关村','亚运村','清华','北大'],
         '东城区':['东单','北京站','朝阳门','银河soho']},
    '上海':
        {'黄浦区':['黄埔1','黄埔2','黄埔3','黄埔4'],
         '浦东区':['浦东1','浦东2','浦东3','浦东4']}
}

order_dic = collections.OrderedDict(sorted(dic.items()))
for k,v in enumerate(order_dic.keys()):
    print (k+1,v)
#break_flag = False
while True:
    break_flag = False
    input_num = input("请输入二级菜单，输入q退出,输入b退出到上一级: ").strip()
    if len(input_num) ==0:continue
    if input_num in Break:break
    if input_num =='q':
        break_flag = True
        break
    new_input_num = int(input_num) -1
    if new_input_num <=1:
        key1 = sorted(dic.keys())[new_input_num]
        for k1,v1 in enumerate(dic[key1]):
            print (k1+1,v1)
    else:
        continue
    while True:
        input_num_2 = input("请输入三级菜单序号，输入q退出,输入b退出到上一级: ").strip()
        if len(input_num_2) ==0:continue
        if input_num_2 in Break:break
        if input_num_2 =='q':
            break_flag = True
            break
        new_input_num_2 = int(input_num_2) -1
        if new_input_num_2 <=1:
            key2 = sorted(dic[key1].keys())[new_input_num_2]
            for k2,v2 in enumerate(dic[key1][key2]):
                print (k2+1,v2)
        else:
            continue


    if break_flag is True:
        break
    else:
        continue