python-----写入txt用法

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time    : 2019/1/14 11:23
# @Author  : zxb

file_path = r‘E:\test\test.txt‘
file1_path = r‘E:\test\test1.txt‘
file_obj = open(file_path)
all_lines = file_obj.readlines()#读test.txt每一行
for line in all_lines:
    print(line)
file_obj.close()
mylist = ["100", "200", "300"]
file_write_obj = open(file_path, ‘w‘) # 以写的方式打开文件，如果文件不存在，就会自动创建
for var in mylist:
    file_write_obj.writelines(var)
    file_write_obj.write(‘\n‘)
file_write_obj.close()

# r为仅读取 w为 a为仅追加
# ‘w‘是以写的方式写入，仅写入。注：该方式会覆盖原数据
# ‘r‘是仅读取
# ‘a‘是以追加的方式写入，仅追加。注：该方式不会覆盖原数据，会接着原数据继续写入