商品管理的程序，商品信息都存在一個json串裏面
一、查詢商品信息 #校驗商品是否存在
二、新增商品 # #校驗商品是否存在 #校驗價格是否合法
三、修改商品信息 ##校驗商品是否存在
if chice =="1":
query_goods()
elif choice = ="2":
add_goods()git
goods.json:json
{
"iphonex":{
"num":100,
"price":1999.98,
"color":"red"
},
"car":{
"num":100,
"price":9999999,
"color":"black"
}
}iphone
import json
FILE_NAME="goods.json"
def check_goods(name,newGood=None):
with open(FILE_NAME, "r+", encoding="utf-8") as f:
goods_dic = json.load(f)
if newGood:
goods_dic[name]=newGood.get(name) #don't use setdefault function, because cann't update the origibal valye
print(goods_dic)
with open(FILE_NAME,"w+",encoding="utf-8") as fw:
json.dump(goods_dic,fw,ensure_ascii=False,indent=4)
else:
#with open(FILE_NAME,"r+",encoding="utf-8") as f:
#goods_dic=json.load(f)
if goods_dic.get(name):
print(name + " 存在！")
return goods_dic
else:
print(name +" 不存在！")
return False
def check_price(price):
if price.count(".")==0 and price.isdigit() and int(price)>=0:
print("price is correct int!")
return True
elif price.count(".")==1:
list=price.split(".")
left = list[0]
right=list[1]
if left.isdigit() and right.isdigit():
print("price is correct float!")
return True
else:
print("price is illegal!")
return False
choice = input("please input your choice:"
" 1. check goods info."
" 2. add goods info"
" 3. edit goods info")
if choice =='1':
goods_name = input("please input the goods name:").strip()
good_dis=check_goods(goods_name)
if good_dis:
print(good_dis.get(goods_name))
elif choice=='2':
name_add=input("please input the goods name you want to add:").strip()
if check_goods(name_add):
print("this goods name exist!")
else:
good_add_dic={}
num = int(input("please input the number:"))
color=input("please input the color:")
price = input("please input the price:").strip()
if check_price(price):
info_add = {"num": num, "price": price, "color:": color}
good_add_dic.setdefault(name_add,info_add)
print("成功添加商品！商品信息爲："+str(good_add_dic))
check_goods(name_add,good_add_dic)
else:
print("價格輸入不正確！")
elif choice =="3":
name_edit=input("please input the goods name you want to edit:")
if check_goods(name_edit):
goods_edit_dic=check_goods(name_edit) # get the goods dic
good_info=goods_edit_dic.get(name_edit) # get the edited good info
changeInfo=input("please choose the info you want to change:"
"1. num"
"2. color"
"3. price").strip()
if changeInfo =='1':
num1 = int(input("please input the number:"))