python逐行读写txt文件的实例讲解

# -*-coding:utf-8-*-import osfile_obj = open("test2.txt")all_lines = file_obj.readlines()for line in all_lines:  print linefile_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('/n')file_write_obj.close()