利用 xml.dom.minidom 生成 xml，解决属性无序问题和xml声明单独一行

1.问题描述

属性无序问题和xml声明不是单独一行

# cat HKEX-EPS_20180830_003249795.xml

<?xml version="1.0" encoding="UTF-8"?><ETCML><IISHeadline><News Encoding="UTF-8" Language="en-us" TimeStamp="20180830194015"><NewsID>2468438</NewsID><NewsDate>20180830194015</NewsDate><ProviderID>HKEX-EPS</ProviderID><Type>AMENDED</Type><Language>en-us</Language><HeadlineTChi></HeadlineTChi><HeadlineSChi></HeadlineSChi><HeadlineEng>CHANGE OF COMPANY NAME,STOCK SHORT NAME AND COMPANY LOGO</HeadlineEng><ExpiryDate>20180831</ExpiryDate><MktCode>MAIN</MktCode><Cancel>false</Cancel><AttachmentList Total="1"><Attachement><FilePath>HKEX-EPS_20180830_003249795_0.PDF</FilePath><FileContentType>APPLICATION/PDF</FileContentType><FileSize>521386</FileSize></Attachement></AttachmentList><AnnouncementTypeList Total="4"><AnnTypeCd>12700</AnnTypeCd><AnnTypeCd>19790</AnnTypeCd><AnnTypeCd>10000</AnnTypeCd><AnnTypeCd>18540</AnnTypeCd></AnnouncementTypeList><RelatedStockList Total="1"><RelatedStock><Code>1400</Code><NameTChi>?地科技股份</NameTChi><NameSChi>满地科技股份</NameSChi><NameEng>MOODY TECH HLDG</NameEng></RelatedStock></RelatedStockList></News></IISHeadline><Product>ET Net IIS Category List</Product><Provider>ET Net Ltd</Provider><Copyright>?2018 ET Net Limited. All rights reserved.</Copyright></ETCML>

达到效果：

cat HKEX-EPS_20180830_003249795.xml

<?xml version="1.0" encoding="UTF-8"?>

<ETCML><IISHeadline><News TimeStamp="20180830194015" Encoding="UTF-8" Language="en-us"><NewsID>2468438</NewsID><NewsDate>20180830194015</NewsDate><ProviderID>HKEX-EPS</ProviderID><Type>AMENDED</Type><Language>en-us</Language><HeadlineTChi></HeadlineTChi><HeadlineSChi></HeadlineSChi><HeadlineEng>CHANGE OF COMPANY NAME,STOCK SHORT NAME AND COMPANY LOGO</HeadlineEng><ExpiryDate>20180831</ExpiryDate><MktCode>MAIN</MktCode><Cancel>false</Cancel><AttachmentList Total="1"><Attachement><FilePath>HKEX-EPS_20180830_003249795_0.PDF</FilePath><FileContentType>APPLICATION/PDF</FileContentType><FileSize>521386</FileSize></Attachement></AttachmentList><AnnouncementTypeList Total="4"><AnnTypeCd>12700</AnnTypeCd><AnnTypeCd>19790</AnnTypeCd><AnnTypeCd>10000</AnnTypeCd><AnnTypeCd>18540</AnnTypeCd></AnnouncementTypeList><RelatedStockList Total="1"><RelatedStock><Code>1400</Code><NameTChi>?地科技股份</NameTChi><NameSChi>满地科技股份</NameSChi><NameEng>MOODY TECH HLDG</NameEng></RelatedStock></RelatedStockList></News></IISHeadline><Product>ET Net IIS Category List</Product><Provider>ET Net Ltd</Provider><Copyright>?2018 ET Net Limited. All rights reserved.</Copyright></ETCML>

2操作步骤

2.1环境说明

系统自带python2.6.6 升级为 python2.7.10

如果没有升级python2.7，

>>> import sys

>>> sys.path

路径为 /usr/lib64/python2.6/xml/dom

使用的模块是

import xml.dom.minidom

2.2换行处理

# cd /usr/local/lib/python2.7/xml/dom/

原始配置

def writexml(self, writer, indent="", addindent="", newl="",

encoding = None):

if encoding is None:

writer.write('<?xml version="1.0" ?>'+newl)

else:

writer.write('<?xml version="1.0" encoding="%s"?>%s' % (encoding, newl))

for node in self.childNodes:

node.writexml(writer, indent, addindent, newl)

修改配置

def writexml(self, writer, indent="", addindent="", newl="",

encoding = None):

if encoding is None:

writer.write('<?xml version="1.0" ?>'+'\n')

else:

writer.write('<?xml version="1.0" encoding="%s"?>%s' % (encoding, '\n'))

for node in self.childNodes:

node.writexml(writer, indent, addindent, newl)

2.3属性有序处理

原始配置

def __init__(self, tagName, namespaceURI=EMPTY_NAMESPACE, prefix=None,

localName=None):

self.tagName = self.nodeName = tagName

self.prefix = prefix

self.namespaceURI = namespaceURI

self.childNodes = NodeList()

self._attrs = {} # attributes are double-indexed:

self._attrsNS = {} # tagName -> Attribute

# URI,localName -> Attribute

# in the future: consider lazy generation

# of attribute objects this is too tricky

# for now because of headaches with

# namespaces.

......

def writexml(self, writer, indent="", addindent="", newl=""):

# indent = current indentation

# addindent = indentation to add to higher levels

# newl = newline string

writer.write(indent+"<" + self.tagName)

attrs = self._get_attributes()

a_names = attrs.keys()

a_names.sort()

修改配置：