使用python自带的xml.dom创建和解析xml

python中的xml.dom模块使用的就是传统的dom解析api和方法。所以也就不写什么了，主要就是练习敲敲代码，继续熟悉python。本文通过xml.dom.minidom创建一个xml文档，然后再解析出来，用以熟悉相关接口方法的使用。

创建一个xml文档：

'''

Createdon2012-1-10

Createaxmldocument

@author:xiaojay

'''

fromxml.domimportminidom

doc=minidom.Document()

doc.appendChild(doc.createComment("Thisisasimplexml."))

booklist=doc.createElement("booklist")

doc.appendChild(booklist)

defaddBook(newbook):

book=doc.createElement("book")

book.setAttribute("id",newbook["id"])

title=doc.createElement("title")

title.appendChild(doc.createTextNode(newbook["title"]))

book.appendChild(title)

author=doc.createElement("author")

name=doc.createElement("name")

firstname=doc.createElement("firstname")

firstname.appendChild(doc.createTextNode(newbook["firstname"]))

lastname=doc.createElement("lastname")

lastname.appendChild(doc.createTextNode(newbook["lastname"]))

name.appendChild(firstname)

name.appendChild(lastname)

author.appendChild(name)

book.appendChild(author)

pubdate=doc.createElement("pubdate")

pubdate.appendChild(doc.createTextNode(newbook["pubdate"]))

book.appendChild(pubdate)

booklist.appendChild(book)

addBook({"id":"1001","title":"Anapple","firstname":"Peter","lastname":"Zhang","pubdate":"2012-1-12"})

addBook({"id":"1002","title":"Love","firstname":"Mike","lastname":"Li","pubdate":"2012-1-10"})

addBook({"id":"1003","title":"Steve.Jobs","firstname":"Tom","lastname":"Wang","pubdate":"2012-1-19"})

addBook({"id":"1004","title":"HarryPotter","firstname":"Peter","lastname":"Chen","pubdate":"2012-11-11"})

f=file("book.xml","w")

doc.writexml(f)

f.close()

通过doc.toprettyxml(indent,newl,encoding)方法可以优雅显示xml文档，但是要避免直接写入文本，否则会给解析带来麻烦，尽量使用自带的writexml方法。

生成的文档内容：

Peter

Zhang

2012-1-12

.................

解析该xml文档：

'''

Createdon2012-1-10

Scanaxmldoc

@author:xiaojay

'''

fromxml.domimportminidom,Node

classbookscanner:

def__init__(self,doc):

forchildindoc.childNodes:

ifchild.nodeType==Node.ELEMENT_NODE\

andchild.tagName=="book":

bookid=child.getAttribute("id")

print"*"*20

print"Bookid:",bookid

self.handle_book(child)

defhandle_book(self,node):

forchildinnode.childNodes:

ifchild.nodeType==Node.ELEMENT_NODE:

ifchild.tagName=="title":

print"Title:",self.getText(child.firstChild)

ifchild.tagName=="author":

self.handle_author(child)

ifchild.tagName=="pubdate":

print"Pubdate:",self.getText(child.firstChild)

defgetText(self,node):

ifnode.nodeType==Node.TEXT_NODE:

returnnode.nodeValue

else:return""

defhandle_author(self,node):

author=node.firstChild

forchildinauthor.childNodes:

ifchild.nodeType==Node.ELEMENT_NODE:

ifchild.tagName=="firstname":

print"Firstname:",self.getText(child.firstChild)

ifchild.tagName=="lastname":

print"Lastname:",self.getText(child.firstChild)

doc=minidom.parse("book.xml")

forchildindoc.childNodes:

ifchild.nodeType==Node.COMMENT_NODE:

print"Conment:",child.nodeValue

ifchild.nodeType==Node.ELEMENT_NODE:

bookscanner(child)

以上内容为大家介绍了使用python自带的xml.dom创建和解析xml，希望对大家有所帮助，如果想要了解更多Python相关知识，请关注IT培训机构:千锋教育。