Python 3 - 文件 read() 方法

描述

方法read()从文件中读取最多size个字节。如果在获取大小字节之前读取命中 EOF，则它只读取可用字节。

句法

以下是语法read()方法 -


fileObject.read( size );

参数

size− 这是要从文件中读取的字节数。

返回值

此方法返回在字符串中读取的字节。

例子

以下示例显示了 read() 方法的用法。


Assuming that 'foo.txt' file contains following text:
This is 1st line
This is 2nd line
This is 3rd line
This is 4th line
This is 5th line


#!/usr/bin/python3
# Open a file
fo = open("foo.txt", "r+")
print ("Name of the file: ", fo.name)
line = fo.read(10)
print ("Read Line: %s" % (line))
# Close opened file
fo.close()

结果

当我们运行上面的程序时，它会产生以下结果 -


Name of the file:  foo.txt
Read Line: This is 1s