Demonstrate creation of a node in the Tree.

.. literalinclude:: ../../languages/python/algorithm_tree.py
   :language: python
   :tab-width: 4

.. runcode:: ../../languages/python/algorithm_tree.py
   :language: python
   :codesite: ideone

.. seealso::

   * :python-suggest-improve:`algorithm_tree.py`
   * :python-better-explain:`algorithm_tree.rst`