from lxml import etree
from lxml.html import parse
schema_root = etree.XML('''\
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="a">
<xs:complexType>
<xs:sequence>
<xs:element name="b" maxOccurs="unbounded">
<xs:complexType>
<xs:attribute name="c" default="1" type="xs:string"/>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>''')
xmls = '''<a>
<b/>
<b c="2"/>
</a>'''
schema = etree.XMLSchema(schema_root)
parser = etree.XMLParser(schema = schema, attribute_defaults = True)
root = etree.fromstring(xmls, parser)
result = etree.tostring(root, pretty_print=True, method="xml")
print result
会给你
<a>
<b c="1"/>
<b c="2"/>
</a>
我稍微修改您的XSD，裹xs:attribute在xs:complexType和添加的架构命名空间。要填写您的默认设置，您需要传递attribute_defaults=True给etree.XMLParser()，它应该可以工作。
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