'''
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。
'''
list_info = []
with open(r'b.txt','r',encoding='utf-8') as f:
for i in f:
list = i.split()
print(list)
list_info.append({'name':list[0],'price':int(list[1]),'count':int(list[2])})
# money = list(map(lambda x:x['price']*x['count'],list_info))
money = map(lambda x: x['price'] * x['count'], list_info)
ss = sum(money)
print('共消费 %d 元'%ss)
print(list_info)
2,有如下文件:
'''
-------
alex是老男孩python发起人,创建人。
alex其实是人妖。
谁说alex是sb?
你们真逗,alex再牛逼,也掩饰不住资深屌丝的气质。
----------
将文件中所有的alex都替换成大写的SB。
'''
import os
with open('a.txt','r',encoding='utf-8') as f ,
open('.a.txt.swap','w',encoding='utf-8') as o:
# data = f.read()
# o.write(data.replace('alex','ALEX')) #方法一:只适合小文件
for i in f:
print(i)
o.write(i.replace('alex', 'ALEX'))
os.remove('a.txt')
os.rename('.a.txt.swap','a.txt')