Python Learning notes-shopping cart

Import Collections
def login ():
li=[' Xiaohei ', ' 123456 ', ' Xiaohuang ', ' 23456 ', ' Xiaoli ', ' 34567 ']
dic={}
C=0
While True:
For I in range (Len (LI)):
if (i+1)%2==1:
Dic[str (Li[i])]=str (li[i+1])
Else
Pass
print ' Welcome to the shopping system! ‘
User=raw_input ("Please enter your user name:")
If user in Dic.keys ():
While c<3:
C+=1
Passwd=raw_input ("Please enter your password:")
If dic[user]==passwd:
print ' Welcome to login! ‘
Return
Else
print ' Password is wrong! Please re-enter '
Else
print ' Input password error 3 times, password is frozen '
Quit ()

Else
print ' User name is wrong! Please re-enter '
Def show (n):
A=[] #记录购买信息
Total=0
Sale=collections.namedtuple (' Sale ', ' product price ')
Sales=[] #记录命名元组的列表
Sales2=[] #记录商品名称的列表
Apple=sale (product= ' Apple ', price=99)
Car=sale (product= ' car ', price=999)
Book=sale (product= ' book ', price=100)
Sales.append (apple)
Sales.append (CAR)
Sales.append (book)
Sales2.append (' Apple ')
Sales2.append (' car ')
Sales2.append (' book ')
While True:
For I in Sales:
Print I.product,i.price

Buy=raw_input (' Enter the item you want to buy or exit: ')
If buy== ' exit ':
Gobuy (Total,n)
Else
If buy in Sales2:
Buy=locals () [Buy] #将字符串转为变量
Total+=buy.price
A.append (' Selected item%s price%s '% (Buy.product,buy.price))
For I in A:
Print I
print ' Total merchandise:%s '%total
Print 9* '-'
Else
print ' Sorry, no product '
Print 9* '-'
def gobuy (total,n):
N=n-total
print ' balance is%s '%n
Nextbuy=raw_input (' Do you want to continue shopping? y/n ')
If nextbuy== ' y ':
Show (total)
Else
print ' Welcome to come again next time! ‘
Quit ()
If __name__== ' __main__ ':
n=5000
Login ()
Show (N)

Python Learning notes-shopping cart