python读取txt、csv、xml

读取txt，无需引入任何包：

 user_file = open('user_info.txt','r')
 lines = user_file.readlines()
 user_file.close()

 for line in lines:
     mail = line.split(',')[0]
     username = line.split(',')[1]
     pwd = line.split(',')[2]
     print(mail,username,pwd)

user_info.txt

www.126.com,user1,pwd1
mail.163.com,user2,pwd2
mail.qq.com,user3,pwd3

读取csv，引入csv（使用wps或office创建excel另存为csv，不能擅自改后缀）：

 import csv

 data = csv.reader( open('csv_read.csv', 'r') )

 for user in data:
     print(user)
     print('url = ',user[0],' | user = ',user[1], ' | pwd = ', user[2])

读取XML，引入xml.dom包（

node.firstChild.data获取文本

）：

 from xml.dom import minidom

 try:
     dom = minidom.parse('data_info.xml')

     root = dom.documentElement

     print(root.nodeName)
     print(root.nodeValue)
     print(root.nodeType)
     print(root.ELEMENT_NODE)

     browser = root.getElementsByTagName('browser')
     print(browser[0].firstChild.data)

     browser2 = root.getElementsByTagName('browser2')
     print(browser2[0].firstChild.data)

     mails = root.getElementsByTagName('mail')
     for mail in mails:
         print(mail.firstChild.data)

     users = root.getElementsByTagName('user')
     i = 0
     for user in users:
         name = user.getElementsByTagName('name')
         i += 1
         print(i,'---',name[0].firstChild.data)
         pwd = user.getElementsByTagName('pwd')
         print(i,'---',pwd[0].firstChild.data)

 except BaseException as msg:
     print(msg)

XML文件：

<info>
<base>
<platform>Windows</platform>
<platform2>Mac</platform2>
<platform3>liunx</platform3>
<browser>Firefox</browser>
<browser2>Chrome</browser2>
<browser3>IE</browser3>
</base>
<test>
<province>北京</province>
<province>广东</province>
<city>深圳</city>
<city>珠海</city>
<province>浙江</province>
<city>杭州</city>
</test>
<user>
<mail>mail.qq.com</mail>
<name>user1</name>
<pwd>pwd1</pwd>
</user>
<user>
<mail>www.126.com</mail>
<name>user2</name>
<pwd>pwd2</pwd>
</user>
<user>
<mail>mail.163.com</mail>
<name>user3</name>
<pwd>pwd3</pwd>
</user>
</info>