Python读取xml报错解析--ExpatError: not well-formed ，invalid token

xml文件内容如代码所示存入的名字为login.xml：

<?xml version="1.0" encoding="utf-8"?>
<info>
   <explain>126</explain>
      <url>http://www.126.com</url>
      <null username="" password="">请先输入您的邮箱帐号</null>
      <pawd_null username="testingwtb" password=""></pawd_null>
      <user_null username="" password="a123456">
      </user_null>
      <error username="xxx" password="xxx"></error>
</info>

Python源代码代码本身是没有错误的：

#coding =utf-8
import xml.dom.minidom

dom=xml.dom.minidom.parse('D:\Python27\lianxidanma\login.xml')
root = dom.documentElement
logins=root.getElementsByTagName('null')
username=logins[0].getAttribute("username")
password=logins[0].getAttribute("password")
prompt_info = logins[0].firstChild.data

print username
print prompt_info

使用xml.dom.mindom库解析xml文件时，报如下错误：

Traceback (most recent call last):
  File "D:\Python27\lianxidanma\xml11.py", line 4, in <module>
    dom=xml.dom.minidom.parse('D:\Python27\lianxidanma\login.xml')
  File "D:\Python27\lib\xml\dom\minidom.py", line 1918, in parse
    return expatbuilder.parse(file)
  File "D:\Python27\lib\xml\dom\expatbuilder.py", line 924, in parse
    result = builder.parseFile(fp)
  File "D:\Python27\lib\xml\dom\expatbuilder.py", line 207, in parseFile
    parser.Parse(buffer, 0)
ExpatError: not well-formed (invalid token): line 5, column 36

其实报这个错误主要还是“转码”的问题，如果xml文件中没有中文，自然能够输入所需要的数据，但是现在xml文件中有中文。

一般情况我们在做自动化测试的时候，习惯用txt来编辑xml文件进行数据保存，但是在用txt编辑完xml文件后，都习惯性的直接点击保存，默认保存的编码方式是ANSI

问题就出在编码方式，如果我们用UTF-8的编码方式保存后，重新执行脚本，那么程序执行成功，正确输出中文：

Python 2.7.9 (default, Dec 10 2014, 12:28:03) [MSC v.1500 64 bit (AMD64)] on win32
Type "copyright", "credits" or "license()" for more information.
>>> ================================ RESTART ================================
>>> 

Traceback (most recent call last):
  File "D:\Python27\lianxidanma\xml11.py", line 4, in <module>
    dom=xml.dom.minidom.parse('D:\Python27\lianxidanma\login.xml')
  File "D:\Python27\lib\xml\dom\minidom.py", line 1918, in parse
    return expatbuilder.parse(file)
  File "D:\Python27\lib\xml\dom\expatbuilder.py", line 924, in parse
    result = builder.parseFile(fp)
  File "D:\Python27\lib\xml\dom\expatbuilder.py", line 207, in parseFile
    parser.Parse(buffer, 0)
ExpatError: not well-formed (invalid token): line 5, column 36
>>> ================================ RESTART ================================
>>> 

请先输入您的邮箱帐号
>>>