What is the use of python read lines()? Where can it be used?

In today’s article, we will learn about the readlines method in Python. Before entering the article, we must first know what pythonreadlines is, readlines()Where can it be used in python programming and what role can it play. We can learn about these things in today’s article.

Overview

The readlines() method is used to read all lines (until the end character EOF) and return a list, which can be used by Python's for... in ...structure is processed.

If the end character EOF is encountered, an empty string is returned.

Syntax

##readlines() method syntax is as follows:

fileObject.readlines( );

Return value

Returns a list containing all rows.

Example

The following example demonstrates the use of the readline() method:

The content of the file runoob.txt is as follows:

1:www.runoob.com
2:www.runoob.com
3:www.runoob.com
4:www.runoob.com
5:www.runoob.com

Loop to read the contents of the file:

# !/usr/bin/python
# -*- coding: UTF-8 -*-
# 打开文件
fo = open("runoob.txt", "r")
print "文件名为: ", fo.name
for line in fo.readlines():  # 依次读取每行  
    line = line.strip()  # 去掉每行头尾空白  
    print "读取的数据为: %s" % (line)
# 关闭文件
fo.close()

The output result of the above example is:

文件名为:  runoob.txt
读取的数据为: 1:www.runoob.com
读取的数据为: 2:www.runoob.com
读取的数据为: 3:www.runoob.com
读取的数据为: 4:www.runoob.com
读取的数据为: 5:www.runoob.com

In this article, we understand what the readlines() method is. If you don’t understand, in fact You can try it yourself. After all, hands-on practice is the best way to verify what you have learned. Finally, I hope this article can bring some help to you who are learning python.

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