python 3.6.4入门 python3.9.6教程

1. 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。

sum = 0
s1 = []
with open('D:\Desktop\Learning\python\ds.txt','r') as f_read:
    datad = f_read.readlines()
    for line in datad:
        print(line)
        s = {}
        s2 = line.strip().split()
        s.setdefault('name',s2[0])
        s.setdefault('price',s2[1])
        s.setdefault('amount',s2[2])
        sum += int(s2[1])
        s1.append(s)
print(s1)
print(sum)

2，有如下文件：

alex是老男孩python发起人，创建人。

import os
with open('D:\Desktop\Learning\python\db.txt','r+',encoding='utf-8') as f_read ,\
        open('D:\Desktop\Learning\python\dsa.txt','w+',encoding='utf-8') as f_wite:
    date = f_read.read()
    date = date.replace('alex','')
    f_wite.write(date)
    f_wite.seek(0)
    print(f_wite.read())
os.remove('db.txt')
os.replace('dsa.txt','db.txt')