python逐行读取与逐行写入txt文件

逐行读取

f = open("test.txt","r")   
lines = f.readlines()      #读取全部内容 ，并以列表方式返回  
for line in lines   
    print line 

逐行写入

# -*-coding:utf8-*-# encoding:utf-8
name_list = [1, 2, 3]
for i in tqdm(name_list):
    f = open('D:/project/tm_caption/file_names.txt', 'a')
    f.write(str(i) + '\n')
    f.close()