def get_data(self, name, default=None):
return self.data.get(name, default)<EOL>
Returns the value of the data field with the given name, or the given
default value if the data field does not exist.

:type  name: str
:param name: A data field name.
:type  default: obj
:param default: Return this value if the data field does not exist.
:rtype:  obj
:returns: The value of the data field