Minidom module writes and parses XML

One 、 Write XML file

from xml.dom import minidom

# 1. establish DOM Tree object 
dom=minidom.Document()

# 2. Create a root node . Use... Every time DOM Object to create any node .
root_node=dom.createElement('root')

# 3. use DOM Object to add the root node 
dom.appendChild(root_node)

#  use DOM Object to create element child nodes 
book_node=dom.createElement('book')

#  Add element child nodes with parent node objects 
root_node.appendChild(book_node)

#  Set the properties of this node 
book_node.setAttribute('price','199')

name_node=dom.createElement('name')
root_node.appendChild(name_node)

#  Also used DOM Create text node , Put the text node （ Written content ） As a child node 
name_text=dom.createTextNode(' Computer programming language   The first 1 edition ')

#  Use the node object with text added （ As the parent node of the text node ） Add text node 
name_node.appendChild(name_text)

#  Every node object （ Include dom Object itself ） They all have output XML Method of content , Such as ：toxml()-- character string , toprettyxml()-- Beautify the tree format .
try:
    with open('dom_write.xml','w',encoding='UTF-8') as fh:
        # 4.writexml() The first parameter is the target file object , The second parameter is the indentation format of the root node , The third parameter is the indent format of other child nodes ,
        #  The fourth parameter sets the line feed format , The fifth parameter establishes xml Coding of content .
        dom.writexml(fh,indent='',addindent='\t',newl='\n',encoding='UTF-8')
        print(' write in xml OK!')
        except Exception as err:
            print(' error message ：{0}'.format(err))

give the result as follows ：

<?xml version="1.0" encoding="utf8"?>
<root>
    <book price="99">
        <name> Computer programming language   The first 1 edition </name>
    </book>
</root>

Two 、 analysis XML file

from xml.dom import minidom

with open('dom_write.xml','r',encoding='utf8') as fh:
    # parse() obtain DOM object 
    dom = minidom.parse(fh)
    
    #  Get root node 
    root = dom.documentElement
    
    #  The name of the node 
    print(root.nodeName)
    
    #  Node type ：'ELEMENT_NODE', Element nodes ; 'TEXT_NODE', Text node ; 'ATTRIBUTE_NODE', Attribute node 
    print(root.nodeType)
    
    #  Get all the children under a node , It's a list 
    print(root.childNodes)
    
    #  adopt dom Object or root element , Then get the element node according to the tag name , It's a list 
    book = root.getElementsByTagName('book')[0]
    
    #  Get node properties 
    print(book.getAttribute('price'))

    #  Get the text content of an element node , Get the sub text node first , And then through “data” Property to get the text content 
    name = root.getElementsByTagName('name')[0]
    name_text_node = name.childNodes[0]
    print(name_text_node.data)

    #  Get the parent node of a node 
    print(name.parentNode.nodeName)