用python语言写一个城市天气信息管理系统

好的，以下是一个简单的城市天气信息管理系统的Python代码：

import json

class CityWeather:
    def __init__(self):
        self.city_weather = {}

    def load_data(self):
        with open('weather.json', 'r') as f:
            self.city_weather = json.load(f)

    def save_data(self):
        with open('weather.json', 'w') as f:
            json.dump(self.city_weather, f)

    def add_city(self, city, weather):
        if city in self.city_weather:
            print("该城市已存在！")
        else:
            self.city_weather[city] = weather
            print("添加成功！")

    def delete_city(self, city):
        if city not in self.city_weather:
            print("该城市不存在！")
        else:
            del self.city_weather[city]
            print("删除成功！")

    def update_city(self, city, weather):
        if city not in self.city_weather:
            print("该城市不存在！")
        else:
            self.city_weather[city] = weather
            print("更新成功！")

    def search_city(self, city):
        if city not in self.city_weather:
            print("该城市不存在！")
        else:
            print(f"{city}的天气为：{self.city_weather[city]}")

    def show_all_cities(self):
        for city in self.city_weather:
            print(city)

if __name__ == '__main__':
    cw = CityWeather()
    cw.load_data()
    while True:
        print("请选择操作：1.添加城市 2.删除城市 3.更新城市 4.查询城市 5.显示所有城市 6.退出")
        choice = input()
        if choice == '1':
            city = input("请输入城市名：")
            weather = input("请输入天气情况：")
            cw.add_city(city, weather)
            cw.save_data()
        elif choice == '2':
            city = input("请输入要删除的城市名：")
            cw.delete_city(city)
            cw.save_data()
        elif choice == '3':
            city = input("请输入要更新的城市名：")
            weather = input("请输入新的天气情况：")
            cw.update_city(city, weather)
            cw.save_data()
        elif choice == '4':
            city = input("请输入要查询的城市名：")
            cw.search_city(city)
        elif choice == '5':
            cw.show_all_cities()
        elif choice == '6':
            break
        else:
            print("输入有误，请重新输入！")

该系统使用了一个字典来存储城市天气信息，并且将数据保存在一个JSON文件中。用户可以选择添加、删除、更新、查询、显示城市信息。用户的选择会对应不同的操作，例如添加城市、删除城市等。程序中也提供了对输入错误的处理，保证程序的稳定性。