python3学习--商品管理小程序
FILENAME='products.json' #常量 import json def get_file_content(): with open(FILENAME,encoding='utf-8') as f : content = f.read() if len(content)>0: res = json.loads(content) else: res = {} return res def write_file_content(dic): with open(FILENAME,'w',encoding='utf-8') as fw: json.dump(dic,fw,indent=4,ensure_ascii=False) def check_digit(st:str): if st.isdigit(): st = int(st) if st>0: return st else: return 0 else: return 0 def add_product(): product_name = input('请输入商品名称:').strip() count = input('请输入商品数量:').strip() price = input('请输入商品价格:').strip() all_products = get_file_content() if check_digit(count) == 0: print('数量输入不合法') elif check_digit(price) == 0: print('价格输入不合法') elif product_name in all_products: print('商品已经存在') else: all_products[product_name] = {"count":int(count), "price":int(price)} write_file_content(all_products) print('添加成功!') def show_product(): product_name = input('请输入要查询的商品名称:').strip() all_products = get_file_content() if product_name=='all': print(all_products) elif product_name not in all_products: print('商品不存在') else: print(all_products.get(product_name)) def del_product(): product_name = input('请输入要删除的商品名称:').strip() all_products = get_file_content() if product_name in all_products: all_products.pop(product_name) print('删除成功') write_file_content(all_products) else: print('商品不存在') choice = input('请输入你的选择:\n 1、添加商品 2、删除商品 3、查看商品信息') if choice=="1": add_product() elif choice=="2": del_product() elif choice=="3": show_product() else: print('输入错误,请重新输入!')