1 list = ((1,'iPhone X',8300),(2,'iPad Pro',4600),(3,'IBM z10',50000),(4,'Coffee',30))
 2 print('Welecome to 7-11 !\n')
 3 print('There are:')
 4 for i in list:print(i)
 5 balance = int(input('\nPlease input your balance: \n'))
 6 car = []  #car[name][prix]
 7 i = 0
 8 while True:
 9     code = input('Please input the code or input exit for exit:')
10     if code == 'exit':break
11     elif balance >= list[int(code)-1][2]:
12         code = int(code)
13         balance -= list[code-1][2]
14         car.insert(i,[i+1,list[code-1][1],list[code-1][2]])
15         i += 1
16     elif balance < list[int(code)-1][2]:
17         print('SO... !\n')
18     else:print('BIUBIUBIU')
19 for i in car:print(i)
20 print(balance)