實現了從products.csv中讀取商品資訊，購買後存入shopping_list.csv中。
第一次購買輸入salary，以後每次購買從shopping_list.csv中獲取餘額。
# -*- coding: utf-8 -*-
# @author: sxq
import csv
# 讀產品
with open("products.csv", "r", encoding = "utf-8") as f:
reader = csv.reader(f)
product_list = [row for row in reader]
# 讀賬戶餘額，檔案最後一行
with open("shopping_list.csv", "r", encoding = "utf-8") as csvfile:
mlines = csvfile.readlines()
if not mlines:
print('your current balance is none')
salary = input('input your salary:')
if salary.isdigit():
salary = int(salary)
else:
salary = mlines[-1].split(',')
salary = int(salary[1])
shopping_list = # 購物車
print('your current balance: '.format(salary))
while salary > 0:
for index, item in enumerate(product_list):
print(index, item)
user_choice = input('選擇要買的商品》:')
if user_choice.isdigit(): # 輸入商品編號是數字
user_choice = int(user_choice)
if user_choice < len(product_list) and user_choice >= 0:# 輸入的數字在商品編碼內
p_item = product_list[user_choice]
if int(p_item[1]) <= salary: # 買得起
salary -= int(p_item[1])
print('added %s into shopping cart, your current balance is \033[31;1m%s\033[0m' % (p_item, salary))
else: # 買不起
print('\033[41;1m你的餘額只剩[%s]了！\033[0m' % salary)
else: # 輸入的數字不在商品編碼內
print('product code [%s] is not exist!' % user_choice)
elif user_choice == 'q': # 輸入退出
print('-----------------shopping list------------------')
for p in shopping_list:
print(p)
print('your current balance:', salary)
with open("shopping_list.csv", "a", encoding="utf-8" ,newline = '') as f:
csv_writer = csv.writer(f)
csv_writer.writerow(['products', 'price'])
csv_writer.writerows(shopping_list)
csv_writer.writerow(['current balance',salary])
exit()
else: # 輸入無效字元
print('invalid option')
your current balance is none
input your salary:10000
your current balance: 10000
0 ['iphonex', '8800']
1 ['mac pro', '9800']
2 ['bick', '800']
3 ['watch', '10600']
4 ['kfc', '31']
5 ['book', '20']
選擇要買的商品》:0
added ['iphonex', '8800'] into shopping cart, your current balance is 1200
0 ['iphonex', '8800']
1 ['mac pro', '9800']
2 ['bick', '800']
3 ['watch', '10600']
4 ['kfc', '31']
5 ['book', '20']
選擇要買的商品》:2
added ['bick', '800'] into shopping cart, your current balance is 400
0 ['iphonex', '8800']
1 ['mac pro', '9800']
2 ['bick', '800']
3 ['watch', '10600']
4 ['kfc', '31']
5 ['book', '20']
選擇要買的商品》:q
-----------------shopping list------------------
['iphonex', '8800']
['bick', '800']
your current balance: 400
繼續購買：
your current balance: 400
0 ['iphonex', '8800']
1 ['mac pro', '9800']
2 ['bick', '800']
3 ['watch', '10600']
4 ['kfc', '31']
5 ['book', '20']
選擇要買的商品》:4
added ['kfc', '31'] into shopping cart, your current balance is 369
0 ['iphonex', '8800']
1 ['mac pro', '9800']
2 ['bick', '800']
3 ['watch', '10600']
4 ['kfc', '31']
5 ['book', '20']
選擇要買的商品》:q
-----------------shopping list------------------
['kfc', '31']
your current balance: 369
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