文件操作

1.将文件内容中含有保罗的，替换为哈登

import os
#第1步
with open('log',encoding='utf-8') as f1,\
    open('log.bak',encoding='utf-8',mode='w') as f2:
    for i in f1:
        #第3步
        new_i = i.replace('保罗', '哈登')
        #第4步
        f2.write(new_i)
#第4步
os.remove('log')
#第5步
os.rename('log.bak','log')

 2.文件a.txt内容：每一行内容分别为商品名字，价钱，个数。

apple 10 3

tesla 100000 1

mac 3000 2

lenovo 30000 3

chicken 10 3

通过代码，将其构建成这种数据类型：[{'name':'apple','price':10,'amount':3},{'name':'tesla','price':1000000,'amount':1}......] 并计算出总价钱。

li = []
the_sum = 0
name_list = ['name','price','amount','year']
with open('a.txt',encoding='utf-8') as f1:
    for i in f1:
        l2 = i.strip().split()
        dic = {}
        for j in range(len(l2)):
            dic[name_list[j]] = l2[j]
        li.append(dic)
#遍历列表
for i in li:
    #计算总价格(单价*个数)
    the_sum += int(i['price']) * int(i['amount'])
 
print(li)
print('总价钱为: {}'.format(the_sum))