Python自学(三)--省市县三级联动,简单增删查

版权声明：by DongBao https://blog.csdn.net/aaaadong/article/details/81117224

将学习中的例子传上来(省市县三级,简单增删查)

# coding:utf8
'''

Created on 2018/7/19
@author:wshh
'''
shengshixian = open('shengshixian','r',encoding='utf8')


for i in shengshixian:
    i=eval(i)
    # print(type(i))
    current_layer = i
    parent_layer = i
    parent_layers = []
    while True:
        for key in current_layer:
            print(key)
            shengshixiantemp = open('shengshixiantemp', 'w', encoding='utf8')
            shengshixiantemp.write(str(current_layer))
            shengshixiantemp.close()
        choice = input(">>>:").strip()
        if len(choice) == 0: continue
        if choice in current_layer:
            # parent_layer = current_layer
            parent_layers.append(current_layer)
            current_layer = current_layer[choice]
        elif choice == 'b':
            # current_layer = parent_layer
            if parent_layers:
                current_layer = parent_layers.pop()
        elif choice == 'c':
            # current_layer = parent_layer
            choice = input("添加>>>:").strip()
            current_layer[choice]={}
        elif choice == 'd':
            # current_layer = parent_layer
            choice = input("删除>>>:").strip()
            del current_layer[choice]
        elif choice == 'e':
            if current_layer == i:
                break
            else:
                print("请输入b返回顶级菜单,才能退出>>>:")
        else:
            print("无此项")

shengshixian.close()

#shengshixian2 = open('shengshixian', 'w', encoding='utf8')

with open('shengshixiantemp',encoding='utf8') as f,open('shengshixian','w',encoding='utf8') as s:
    for i in f:
        i = eval(i)
        print(i)
        s.write(str(i))

其中shengshixian文件如下

{'内蒙古': {'呼和浩特': {'赛罕区': {}}}, '北京': {'朝阳': {'望京': {}, '国贸': {'万达': {}}, '三里屯': {}}, '海淀': {'西三旗': {}, '圆明园': {}, '西二旗': {}}}, '天津': {'红桥': {'丁字沽': {}, '天津西站': {}}, '南开': {'南开大学': {}, '南开医院': {}}}}

运行效果如图

完整项目如下

 https://download.csdn.net/download/aaaadong/10551569