Python file.readlines()方法

发布于 2015-06-21 10:39:16 | 271 次阅读 | 评论: 0 | 来源: 网络整理

readlines()方法读取使用ReadLine()并返回包含行的列表直到EOF。如果可选sizehint参数不是读取到达EOF，全行共计约sizehint字节(可能四舍五入到内部缓冲区的大小后)被读取。

语法

以下是readlines()方法的语法：

fileObject.readlines( sizehint );

参数

• sizehint -- 这是可以从文件中读取的字节数。

返回值

这个方法返回一个包含行的列表。

例子

下面的例子显示readlines()方法的使用。

#!/usr/bin/python

# Open a file
fo = open("foo.txt", "rw+")
print "Name of the file: ", fo.name

# Assuming file has following 5 lines
# This is 1st line
# This is 2nd line
# This is 3rd line
# This is 4th line
# This is 5th line

line = fo.readlines()
print "Read Line: %s" % (line)

line = fo.readlines(2)
print "Read Line: %s" % (line)

# Close opend file
fo.close()

当我们运行上面的程序，它会产生以下结果：

Name of the file:  foo.txt
Read Line: ['This is 1st linen', 'This is 2nd linen', 
            'This is 3rd linen', 'This is 4th linen', 
            'This is 5th linen']
Read Line: []