1.将文件内容中含有保罗的，替换为哈登
1 import os
2 #第1步
3 with open('log',encoding='utf-8') as f1,\
4 open('log.bak',encoding='utf-8',mode='w') as f2:
5 for i in f1:
6 #第3步
7 new_i = i.replace('保罗', '哈登')
8 #第4步
9 f2.write(new_i)
10 #第4步
11 os.remove('log')
12 #第5步
13 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。
1 li = []
2 the_sum = 0
3 name_list = ['name','price','amount','year']
4 with open('a.txt',encoding='utf-8') as f1:
5 for i in f1:
6 l2 = i.strip().split()
7 dic = {}
8 for j in range(len(l2)):
9 dic[name_list[j]] = l2[j]
10 li.append(dic)
11 #遍历列表
12 for i in li:
13 #计算总价格(单价*个数)
14 the_sum += int(i['price']) * int(i['amount'])
15
16 print(li)
17 print('总价钱为: {}'.format(the_sum))
