converters.py 文件源码

def __setattr__(self, name, value):
        if name == ('attr_prefix', 'text_key', 'cdata_prefix') and value is not None:
            if any(c in string.letters or c == '_' for c in value):
                raise XMLSchemaValueError(
                    '%r cannot include letters or underscores: %r' % (name, value))
        super(NamespaceMapper, self).__setattr__(name, value)