Class TreeNode

constructor

**Arguments**

  - parent: the parent of this node in the tree

  - name: the name of the node

  - label: the node's label (should be an integer)

  - data: an optional data field

  - level: an integer indicating the level of this node in the hierarchy
    (used for printing)

  - isTerminal: flags a node as being terminal.  This is useful for those
    times when it's useful to know such things.

Set the names of each node in the tree from a list of variable names.

**Arguments**

  - varNames: a list of names to be assigned

**Notes**

   1) this works its magic by recursively traversing all children

   2) The assumption is made here that the varNames list can be indexed
      by the labels of tree nodes

Set the names of each node in the tree from a list of variable names.

**Arguments**

  - varNames: a list of names to be assigned

**Notes**

   1) this works its magic by recursively traversing all children

   2) The assumption is made here that the varNames list can be indexed
      by the labels of tree nodes

Adds a TreeNode to the local list of children

**Arguments**

  - node: the node to be added

**Note**

  the level of the node (used in printing) is set as well

Creates a new TreeNode and adds a child to the tree

**Arguments**

 - name: the name of the new node

 - label: the label of the new node (should be an integer)

 - data: the data to be stored in the new node

 - isTerminal: a toggle to indicate whether or not the new node is
   a terminal (leaf) node.

**Returns*

  the _TreeNode_ which is constructed
  

Removes the child node

**Arguments**

  - child: a TreeNode

Replaces a given child with a new one

**Arguments**

  - index: an integer
  
  - child: a TreeNode

Returns a python list of the children of this node

    

Destroys this node and all of its children

    

Returns the name of this node

    

Sets the name of this node

    

Returns the data stored at this node

    

Sets the data stored at this node

    

Returns whether or not this node is terminal 

    

Sets whether or not this node is terminal 

    

Returns the label of this node

    

Sets the label of this node (should be an integer)

    

Returns the level of this node

    

Sets the level of this node

    

Returns the parent of this node

    

Sets the parent of this node

    

Pretty prints the tree

**Arguments**

  - level: sets the number of spaces to be added at the beginning of the output

  - showData: if this is nonzero, the node's _data_ value will be printed as well

**Note**

  this works recursively

Pickles the tree and writes it to disk

    

returns a string representation of the tree

**Note**

  this works recursively

allows tree1 == tree2

**Note**

  This works recursively