'''
1、文件a.txt内容：每一行内容分别为商品名字，价钱，个数，求出本次购物花费的总钱数
apple 10 3
tesla 100000 1
mac 3000 2
lenovo 30000 3
chicken 10 3
'''
# with open(r'z.txt','r',encoding='utf-8')as f:
# print(f.read())
# print('总金额为：' + str(10*3+100000*1+3000*2+30000*3+10*3))
'''
2、修改文件内容，把文件中的tank都替换成DSB（文件自己创建，数据自己添加）
'''
# with open(r'a.txt','r',encoding='gbk')as f:
# d1 = f.read()
# with open(r'a.txt','w',encoding='gbk')as f:
# g1 = d1.replace('tank','DSB')
# f.write(g1)
# import os
# with open(r'b.txt','r',encoding='gbk')as rf,
# open(r'b1.txt','w',encoding='gbk')as wf:
# d1 = rf.read()
# g1 = d1.replace('tank','DSB')
# wf.write(g1)
#
# os.remove('b.txt')
# os.rename('b1.txt','b.txt')