我想有以下NS前缀
<qsp:QSPart xmlns:qsp="urn:qvalent:quicksuper:gateway">
<qsp:MemberRegistrationRequest/>
</qsp:QSPart>
我如何在LMXL python中做到这一点?
from lxml import etree
nsmap = {'qsp': 'urn:qvalent:quicksuper:gateway'}
nsprefix = nsmap['qsp']
QSPart = etree.Element('QSPart', nsmap=nsmap)
MemberRegistrationRequest = etree.SubElement(QSPart, etree.QName(nsprefix, 'MemberRegistrationRequest'))
print(etree.tostring(QSPart, pretty_print=True, encoding=str))
结果:
<QSPart xmlns:qsp="urn:qvalent:quicksuper:gateway">
<qsp:MemberRegistrationRequest/>
</QSPart>
根据文档，您需要在对etree.Element的调用中完全限定元素名称:
from lxml import etree
nsmap = {'qsp': 'urn:qvalent:quicksuper:gateway'}
nsprefix = nsmap['qsp']
QSPart = etree.Element(f'{{{nsmap["qsp"]}}}QSPart')
MemberRegistrationRequest = etree.SubElement(QSPart, etree.QName(nsprefix, 'MemberRegistrationRequest'))
print(etree.tostring(QSPart, pretty_print=True, encoding=str))
这个输出:
<ns0:QSPart xmlns:ns0="urn:qvalent:quicksuper:gateway">
<ns0:MemberRegistrationRequest/>
</ns0:QSPart>
既然您知道预期的输出，我就不需要那么麻烦了(尽管我知道许多人不赞成这种方法…)—只需使用from和to string:
frag_text = """<qsp:QSPart xmlns:qsp="urn:qvalent:quicksuper:gateway">
<qsp:MemberRegistrationRequest/>
</qsp:QSPart>"""
fragment = etree.fromstring(frag_text)
print(etree.tostring(fragment).decode())
输出应该是你期望的输出。