python逐行读写txt文件

# -*-coding:utf-8-*-
import os

file_obj = open("test2.txt")
all_lines = file_obj.readlines()
for line in all_lines:
    print line
file_obj.close()

# 写之前，先检验文件是否存在，存在就删掉
if os.path.exists("dest.txt"):
    os.remove("dest.txt")
mylist = ["luoluo", "taotao", "mumu"]

# 以写的方式打开文件，如果文件不存在，就会自动创建
file_write_obj = open("dest.txt", "w")
for var in mylist:
    file_write_obj.writelines(var)
    file_write_obj.write("
")
file_write_obj.close()