@property<EOL><INDENT>def is_leaf(self):<DEDENT>
return len(self.__children_) == <NUM_LIT:0><EOL>
`Node` has no children (External Node).

>>> from anytree import Node
>>> udo = Node("Udo")
>>> marc = Node("Marc", parent=udo)
>>> lian = Node("Lian", parent=marc)
>>> udo.is_leaf
False
>>> marc.is_leaf
False
>>> lian.is_leaf
True