#商品管理的程序 ，商品都存在一个json串#  1新增商品    校验商品是否存在   校验价格是否合法#  2查询商品信息 校验商品是否存在#   3修改商品信息  校验商品是否存在#4  删除import jsonFILE_NAME ='goods.json'def op_file(name,content=None):    if content:        with open(name,'w',encoding='utf-8')as fw:    #写            json.dump(content,fw,indent=4,ensure_ascii=False)    else:        with open(name,encoding='utf-8')as fr:   #读            res = json.load(fr)            return resall_goods = op_file(FILE_NAME)def check_price(price):        #校验价格    price = str(price)    if price.isdigit():        price = int(price)        if price>0:            return True    else:        if price.count('.')==1:            tmp = price.split('.')            left = tmp[0]            right = tmp[1]            if left.isdigit() and right.isdigit()and int(right)>0:  #1.0                return True            elif left.isdigit() and right.isdigit()and int(left)>0:  #0.1                return True    return Falsedef get_good_info():    #商品信息    while True:        good_name = input('请输入商品名称：').strip()        price = input('请输入商品价格：').strip()        count = input('请输入商品数量：').strip()        color = input('请输入商品颜色：').strip()        if good_name and price and count and color:            if not check_price(price):                print('价格输入不合法，必须大于0')            elif not count.isdigit and int(count)<1:                print('商品数量不合法')            else:                return good_name,price,count,color        else:            print('输入不能为空！')def add_good():   #添加商品    good_name,price,count,color = get_good_info()    if good_name not in all_goods:        all_goods[good_name]={            'price':price,            'count':count,            'color':color        }        op_file(FILE_NAME,all_goods)        print('添加完成！')    else:        print('商品已经存在！')def update_good():   #修改商品    good_name,price,count,color = get_good_info()    if good_name in all_goods:        all_goods[good_name]={            'price':price,            'count':count,            'color':color        }        op_file(FILE_NAME,all_goods)        print('修改完成！')    else:        print('商品不存在！')def query_good():    #查询    good_name = input('请输入商品名称：').strip()    if good_name in all_goods():        print(all_goods.get(good_name))    else:        print('商品不存在')def delete_good():  #删除    good_name = input('请输入商品名称：').strip()    if good_name in all_goods:        all_goods.pop(good_name)        op_file(FILE_NAME,all_goods)    else:        print('商品不存在')def main():    for i in range(3):        choice = input('请输入你的选择'                   '1.添加'                   '2.修改'                   '3.删除'                   '4.查看'                   '5.退出')        if choice =='1':            add_good()        elif choice =='2':            update_good()        elif choice =='3':            delete_good()        elif choice =='4':            query_good()        elif choice =='5':            quit('程序退出')        else:            print('输入错误，请重新输入！')            return main()main()