python - 转储时如何删除ns0标签

Question

我尝试使用 lxml iterparse 解析文件，因为实际文件会很大。我有以下代码:

import xml.etree.cElementTree as etree
filename = r'D:\test\Books.xml'
context = iter(etree.iterparse(filename, events=('start', 'end')))
_, root = next(context)
for event, elem in context:
    if event == 'start' and elem.tag == '{http://www.book.org/Book-19200/biblography}Book':
        print(etree.dump(elem))
        root.clear()

我的 XML 看起来像这样:

<Books>
    <Book xmlns="http://www.book.org/Book-19200/biblography"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    ISBN="519292296"
    xsi:schemaLocation="http://www.book.org/Book-19200/biblography ../../book.xsd 
    http://www.w3.org/2000/12/xmldsig# ../../xmldsig-core-schema.xsd">
        <Detail ID="67">
            <BookName>Code Complete 2</BookName>
            <Author>Steve McConnell</Author>
            <Pages>960</Pages>
            <ISBN>0735619670</ISBN>        
            <BookName>Application Architecture Guide 2</BookName>
            <Author>Microsoft Team</Author>
            <Pages>496</Pages>
            <ISBN>073562710X</ISBN>
        </Detail>
    </Book>
    <Book xmlns="http://www.book.org/Book-19200/biblography"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    ISBN="519292296"
    xsi:schemaLocation="http://www.book.org/Book-19200/biblography ../../book.xsd 
    http://www.w3.org/2000/12/xmldsig# ../../xmldsig-core-schema.xsd">
        <Detail ID="87">
            <BookName>Rocking Python</BookName>
            <Author>Guido Rossum</Author>
            <Pages>960</Pages>
            <ISBN>0735619690</ISBN>
            <BookName>Python Rocks</BookName>
            <Author>Microsoft Team</Author>
            <Pages>496</Pages>
            <ISBN>073562710X</ISBN>
        </Detail>
    </Book>
</Books>

运行上面的代码会生成如下内容:

<ns0:Book xmlns:ns0="http://www.book.org/Book-19200/biblography" xmlns:xsi="http://www.w3.org/2001/XMLSchema-ins
ance" ISBN="519292296" xsi:schemaLocation="http://www.book.org/Book-19200/biblography ../../book.xsd      http:/
www.w3.org/2000/12/xmldsig# ../../xmldsig-core-schema.xsd">
        <ns0:Detail ID="67">
            <ns0:BookName>Code Complete 2</ns0:BookName>
            <ns0:Author>Steve McConnell</ns0:Author>
            <ns0:Pages>960</ns0:Pages>
            <ns0:ISBN>0735619670</ns0:ISBN>
            <ns0:BookName>Application Architecture Guide 2</ns0:BookName>
            <ns0:Author>Microsoft Team</ns0:Author>
            <ns0:Pages>496</ns0:Pages>
            <ns0:ISBN>073562710X</ns0:ISBN>
        </ns0:Detail>
    </ns0:Book>

如何确保打印 xml 片段没有 ns0 前缀？我正在使用 Python 3。

Answer 1

添加

etree.register_namespace("", "http://www.book.org/Book-19200/biblography")

到你的程序。该函数注册一个命名空间前缀用于序列化(在本例中表示无前缀)。

引用:http://docs.python.org/3/library/xml.etree.elementtree.html#xml.etree.ElementTree.register_namespace