python写商品管理练习

#、添加

    #、商品名称

        #、要从文件里面把所有的商品读出来

    #、价格

        #、写一个方法判断是否为合理的价格

    #、数量

        #整数

   # product = {

   #      "爱疯差":{

   #        "price":999.98,

   #        "count":

   #      },

   #    "car":{

   #      "price":,

   #      "count":

   #    }

   #  }

   # product['mac'] = {"price":,"count":}

    # write(product)

    # 写入文件，最新的商品写进去

#、删除

    # 、商品名称

        # 、要从文件里面把所有的商品读出来

# product = {

#     "爱疯差": {

#         "price": 999.98,

#         "count":

#     },

#

# }

# product.pop('car')

#、查询

    # 、要从文件里面把所有的商品读出来

FILENAME = 'product.json'

import json

import os

def get_product():

    with open(FILENAME,'a+',encoding='utf-8') as fr:

        fr.seek()

        content = fr.read()

        if content:

            res = json.loads(content)

        else:

            res = {}

    return res

def is_price(s):

    s=str(s)

    if s.count('.')==:

        left,right = s.split('.')

        if left.isdigit() and right.isdigit():

            print('正小数')

            return float(s)

    elif s.isdigit():

        if int(s)>:

            print('大于0的整数')

            return int(s)

    return False

def is_count(s):

    if s.isdigit():

        if int(s)>:

            return int(s)

def write_product(product_dic):

    with open(FILENAME,'w',encoding='utf-8') as fw:

        json.dump(product_dic,fw,ensure_ascii=False,indent=)

def add():

    all_products = get_product()

    pname = input('product_name:').strip()

    price = input('product_price:').strip()

    count = input('product_count:').strip()

    if not pname or not price or not count:#为空的时候干啥

        print('不能为空！')

    elif pname in all_products:

        print('商品已经存在')

    elif not is_price(price):

        print('价格不合法，只能是大于0的数值')

    elif not is_count(count):

        print('数量不合法！')

    else:

        all_products[pname] = {"price": float(price), "count": int(count)}

        write_product(all_products)

        print('添加商品成功')

        return

    return add()

    # if pname and price and count: #不为空的时候，我干啥。。

def delete():

    all_products = get_product()

    pname = input('product_name:').strip()

    if not pname :#为空的时候干啥

        print('不能为空！')

    elif pname not in all_products:

        print('商品不存在')

    else:

        all_products.pop(pname)

        write_product(all_products)

        print('删除商品成功')

        return

    return delete()

def show():

    all_products = get_product()

    if all_products:

        print(all_products)

    else:

        print('暂时还没有商品！')

choice = input('1、add\n'

               '2、delete\n'

               '3、show \n'

               '4、exit \n')

func_map = {"":add,"":delete,"":show,"":quit}

if choice in func_map:

    func_map[choice]()

else:

    print('输入有误！')

# if choice =="":

#     add()

# elif choice=="":

#     delete()

# elif choice=="":

#     show()

# elif choice=="":

#     quit("程序退出")

# else:

#     print('输入错误！')

# def a():

#     print('asdfdfs')

#

# b = a

# b()

#函数即变量