Python 3 File read()用法及代码示例

描述

方法read()从文件中最多读取 size 个字节。如果读取在获得 size 字节之前命中 EOF，则它仅读取可用字节。

用法

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。

示例

下面的例子展示了 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

当我们运行上述程序时，它会产生以下结果 -

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