写文件

写文件- write 方法

要写入文件，请使用 write 方法，该方法将字符串写入文件。

例如:

file = open("newfile.txt", "w")

file.write("This has been written to a file")

file.close()

file = open("newfile.txt", "r")

print(file.read())

file.close()

结果:

This has been written to a file

“w” 模式如果文件不存在，将创建一个文件。

写文件-“w” 模式

当以写入（"w"）模式打开文件时，文件的现有内容会被删除。

# -*- coding: UTF-8 -*-

file = open("newfile.txt", "r")

print("读取newfile.txt")

print(file.read())

print("===结束===")

file.close()

file = open("newfile.txt", "w")

file.write("写入一些新的内容")

file.close()

file = open("newfile.txt", "r")

print("再次读取newfile.txt")

print(file.read())

print("===结束===")

file.close()

自己试试。

写文件-返回

如果写入成功的话 write 方法返回写入文件的字节数。

msg = "Hello world!"

file = open("newfile.txt", "w")

amount_written = file.write(msg)

print(amount_written)

file.close()

结果：

12