def to_tree(self, tagname=None):
if tagname is None:
tagname = self.tagname
attrs = dict(self)
el = Element(tagname, attrs)
for n in self.__nested__:
value = getattr(self, n)
if isinstance(value, tuple):
if hasattr(el, 'extend'):
el.extend(self._serialise_nested(value))
else: # py26 nolxml
for _ in self._serialise_nested(value):
el.append(_)
elif value:
SubElement(el, n, val=safe_string(value))
for child in self.__elements__:
obj = getattr(self, child)
if isinstance(obj, tuple):
for v in obj:
if hasattr(v, 'to_tree'):
el.append(v.to_tree(tagname=child))
else:
SubElement(el, child).text = v
elif obj is not None:
el.append(obj.to_tree(tagname=child))
return el
