def strip_ns_prefix(tree):
#iterate through only element nodes (skip comment node, text node, etc) :
for element in tree.xpath('descendant-or-self::*'):
#if element has prefix...
if element.prefix:
#replace element name with its local name
element.tag = etree.QName(element).localname
return tree
在xpath中有名称空间检查而不是使用ifstatement的另一个版本：
def strip_ns_prefix(tree):
#xpath query for selecting all element nodes in namespace
query = "descendant-or-self::*[namespace-uri()!='']"
#for each element returned by the above xpath query...
for element in tree.xpath(query):
#replace element name with its local name
element.tag = etree.QName(element).localname
return tree
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