Introduction

I had to output RSS ver2 with Python, but I made a note because it was moss several times at that time.

Python has a high affinity with json, but XML seems awkward. I have some libraries as below, but I can't realize what I want to do.

feedgenerator
→ It looks good because it is made by google, but it can not generate unique tags such as lastUpdate
xml.etree.ElementTree
→ ʻExpat Error` occurs when Japanese is entered in the tag element

manner

After all, I settled down by converting from a DOM object to XML.

When generating from an XML template of a string

#!/usr/bin/env python
# coding: utf-8

from xml.dom.minidom import parseString

xml_template = "<rss version=\"2.0\">\
        <channel>\
            <title>title</title>\
            <link>link</link>\
            <description>desctiption</description>\
            <language>ja</language>\
        </channel></rss>"
dom = parseString(xml_template)

#Get channel node
channel = dom.getElementsByTagName("channel")[0]

#Generate item node
item = dom.createElement('item')
#Add to channel node
channel.appendChild(item)

#Subnode generation
subnode = dom.createElement('subnode')
subnode.appendChild(dom.createTextNode("Japanese is also OK"))
#Set attribute and value in subnote
subnode_attr = dom.createAttribute('key')
subnode_attr.value = 'value'
subnode.setAttributeNode(subnode_attr)
#Add subnode node to item node
item.appendChild(subnode)

#Convert dom to xml and format
print (dom.toprettyxml())

output

<?xml version="1.0"?>
<rss version="2.0">
  <channel>
    <title>title</title>
    <link>link</link>
    <description>desctiption</description>
    <language>ja</language>
    <item>
      <subnode key="value">Japanese is also OK</subnode>
    </item>
  </channel>
</rss>

When generating XML from 1

#!/usr/bin/env python
# coding: utf-8

import xml.dom.minidom

#Generating a DOM object
dom = xml.dom.minidom.Document()

#Creating and adding root nodes
root = dom.createElement('root')
dom.appendChild(root)

#Subnode generation
subnode = dom.createElement('subnode')
subnode.appendChild(dom.createTextNode("Japanese is also OK"))
#Set attribute and value in subnote
subnode_attr = dom.createAttribute('key')
subnode_attr.value = 'value'
subnode.setAttributeNode(subnode_attr)
#Add subnode node to item node
root.appendChild(subnode)

#Convert dom to xml and format
print (dom.toprettyxml())

output

<?xml version="1.0"?>
<root>
  <subnode key="value">Japanese is also OK</subnode>
</root>

Summary

json best

Reference

Generate XML (RSS) with Python

Introduction

manner

When generating from an XML template of a string

When generating XML from 1

Summary