File函数 中的 file.readlines([sizehi

Python file methodreadlines()使用readline()读取EOF，并返回包含行的列表。如果存在可选的sizehint参数，则读取总计大约sizehint字节的整行(可能在舍入到内部缓冲区大小之后)，而不是读取EOF。

仅当立即遇到EOF时才返回空字符串。

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file.readlines - 语法

fileObject.readlines( sizehint );

• sizehint  -  这是要从文件中读取的字节数。

file.readlines - 返回值

此方法返回包含行的列表。

file.readlines - 示例

以下示例显示readlines()方法的用法。

This is 1st line
This is 2nd line
This is 3rd line
This is 4th line
This is 5th line

#!/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()

当无涯教程运行上面的程序时，它产生以下输出-

Name of the file:  foo.txt
Read Line: ['Python is a great language.\n', 'Yeah its great!!\n']
Read Line: []