详解Python的文件处理

#open函数：接收一个文件名，还有其他参数可省略不写。
one_file = open('myfile.txt')
#读取数据赋值给data变量
data = one_file.read()
#一个文件对象的write函数
one_file = open('myfile.txt','w')
#write函数：传入数据，write函数把数据写入到one_file对应的文件中。
one_file.write('写到文件的数据')

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afile = open("sample.txt")
print(afile.read())

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time : 2021/11/12 11:58 下午
# @Author : LeiXueWei
# @CSDN/Juejin/Wechat: 雷学委
# @XueWeiTag: CodingDemo
# @File : filedemo.py
# @Project : hello
afile = open("sample.txt")
data = afile.read()
print("sample file content=", data)
afile.close()
#把sample读取的数据写到test文件
afile = open("./test.txt", "w")
afile.write(data)
afile.close()
print("write data to test file!")
afile = open("./test.txt")
data = afile.read()
afile.close()
print("test file content=", data)

one_file.close() #文件对象.close()

with open('sample.txt', 'r') as one_file:
    data = one_file.read()
#无须调用close了，这个with代码块内，python会帮我们自动关闭文件。

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time : 2021/11/12 11:58 下午
# @Author : LeiXueWei
# @CSDN/Juejin/Wechat: 雷学委
# @XueWeiTag: CodingDemo
# @File : filedemo2.py
# @Project : hello
with open("sample.txt") as afile:
    data = afile.readline()
    print("sample file content=", data)
with open("./test.txt", "w") as afile:
    afile.write(data)
    print("write data to test file!")
with open("test.txt") as afile:
    data = afile.readline()
    print("test file content=", data)