python基礎題，python基礎作業_017--python基礎作業

#購物車#1. 商品信息- 數量、單價、名稱#2. 用戶信息- 帳號、密碼、余額#3. 用戶可充值#4. 購物歷史信息#5. 允許用戶多次購買，每次可購買多件#6. 余額不足時進行提醒#7. 用戶退出時 ，輸出當次購物信息

importsys

flag_break=False

old_user=TruewhileTrue:

user_name= input('用戶名：').strip()

python基礎題？with open('old_user',encoding='utf-8') as f_old:for line inf_old:if line.strip() ==user_name:

old_user= True #判斷是老用戶標志位

password =input('密碼：').strip()

with open('shopping_user',encoding='utf-8') as f_user:for line inf_user:

username,passwd,balance=line.strip().split()if user_name == username and password ==passwd:print('登錄成功，您的余額：%s'%balance)

salary=int(balance)

python大作業。flag_break=Trueif notflag_break:

sys.exit('登錄失敗')if old_user: #執行對于老用戶打印歷史購物信息的工作

with open('shopping_history',encoding='utf-8') as f_history:

file_history=f_history.read()print('您以前購買過以下商品'.center(50,'-'))print('id 商品 數量 單價 總價')print(file_history.strip())print('end'.center(60,'-'))

shopping_cart= {} #購物車

product_list =[

python編程入門。['自行車',999],

['充電寶',555],

['茅臺酒',650],

['鉑金筆',500],

['電飯鍋',200]

]whileTrue:

Python作業。index=0for product inproduct_list:print(index,product)

index+=1choice= input('請輸入商品編號，或者q直接退出')if choice=='q':print('您已購買以下商品'.center(50,'-'))

id_count= 1total_cost=0print('id 商品 數量 單價 總價')for key inshopping_cart:

msg= ("%s\t\t%s\t\t%s\t\t%s\t\t%s"

%(id_count,

key,

python爬蟲教程？shopping_cart[key][1],

shopping_cart[key][0],

shopping_cart[key][1]*shopping_cart[key][0]

)

)print(msg)

id_count+=1total_cost+=shopping_cart[key][1]*shopping_cart[key][0]

python語言程序設計、with open('shopping_history', 'a+', encoding='utf-8') as f_history:

f_history.write('\n' +msg)print('您的總花費為：',total_cost)print('您的余額為：'+str(salary))print('end'.center(60,'-'))

with open('old_user', 'a+',encoding='utf-8') as f_old:

f_old.write('\n' +user_name)

sys.exit()

number= input('請輸入購買數量：')if choice.isdigit() andnumber.isdigit():

python有什么用，choice=int(choice)

number=int(number)if choice >= 0 and len(product_list) >=choice:

product=product_list[choice]if product[1]*number <=salary:if product[0] inshopping_cart:

shopping_cart[product[0]][1] += number #[price ,數量] 只需要把數量+1 ，加入購物車

else:

shopping_cart[product[0]]= [product[1],number]

python和java，salary-=product[1]*numberprint('您已購買 %s個%s ，您的余額為：%s'%(number,product[0],salary))else:print("商品的價格為:%s,購買數量%s個,還差%s元"%(product[1],number,product[1]*number-salary))

more_money= input('你想要充值嗎?y/n:').strip()if more_money == 'n':

sys.exit()if more_money == 'y':

recharge= int(input('充值:').strip())

salary+=rechargeelse:print('商品編號不存在，請重新輸入')else:print('編號不存在，請重新輸入')