python is used to implement simple cyclic shopping cart function

This paper mainly introduces the python to realize the circular shopping cart function related content, sharing for your reference and learning, the following is a detailed introduction:

The sample code

# -*- coding: utf-8 -*-
__author__ = 'hujianli'

shopping = [
 ("iphone6s", 5000),
 ("book python", 81),
 ("iwach", 3200),
 (" The TV ", 2200)
]

def zero(name):
 if len(name) == 0:
  print("\033[31;1m Your input cannot be empty, please enter again ~~\033[0m")
  exit()
 else:
  return True

def crre(name):
 if int(name) not in range(len(shopping)):
  print("\033[31;1m You entered the wrong serial number, please reenter it ~~\033[0m")
  exit()
 else:
  return True



gongzi = input(" Please enter your current salary: ")
if not gongzi.isdigit():
 crre()
elif len(gongzi) == 0:
 zero()
else:
 gongzi = int(gongzi)
 print("=========================================")
 print("=== The list of items to buy is as follows:  ")
 for i,j in enumerate(shopping):
  print(i, j[0], j[1])

shopping_cart = []
while True:
 choice = input(" Please enter the item you want to buy , The input q or exit Exit to return to shopping cart list:  ")
 if choice.isdigit():
  zero(choice)
  crre(choice)
  choice = int(choice)
  goods = shopping[choice]
  if gongzi < int(goods[1]):
   gongzi -= goods[1]
   print("=== Your salary balance is not enough. It's not enough \033[1;31m{}\033[0m Please work hard to make money ===.".format(abs(gongzi)))
  else:
   print(" The goods you choose :\033[1;32m %s \033[0m  Added to cart .." % (goods[0]))
   shopping_cart.append(goods)
   gongzi -= goods[1]
   print(" Your salary balance is left over :\033[30;42m %s\033[0m"% (gongzi))
 elif (choice == "q") or (choice == "exit"):
  break

print('\033[30;42m List of goods you have ordered \033[0m'.center(42,'-'))
for i,j in enumerate(shopping_cart):
 print("\033[1;32m" + str(i+1) + " " + str(j[0]) + " " + str(j[1]) + "\033[0m")

conclusion