human
I am working on the file "Python/Chapter-06/2-3-Trees-Visualization.ipynb".
The first task is:
This notebook presents 2-3 trees.  We define these trees inductively as follows:
  - $\texttt{Nil}$ is a 2-3 tree that represents the empty set.
  - $\texttt{Two}(l, k, r)$ is a 2-3 tree provided that
      - $l$ is a 2-3 tree,
      - $k$ is a key,
      - $r$ is a 2-3 tree,
      - all keys stored in $l$ are less than k and all keys stored in $r$ are bigger than $k$, that is we have
        $$ l < k < r. $$
      - $l$ and $r$ have the same height.
      A node of the form  $\texttt{Two}(l, k, r)$ is called a 2-node.  Except for the fact
      that there is no value, a 2-node is
      interpreted in the same way as we have interpreted the term $\texttt{Node}(k, v, l, r)$.
  - $\texttt{Three}(l, k_l, m, k_r, r)$ is a 2-3 tree provided
      - $l$, $m$, and $r$ are 2-3 trees,
      - $k_l$ and $k_r$ are keys,
      - $l < k_l < m < k_r < r$,
      - $l$, $m$, and $r$ have the same height.
      A node of the form  $\texttt{Three}(l, k_l, m, k_r, r)$ is called a 3-node. 
In order to keep 2-3 trees balanced when inserting new keys we use a fourth constructor of the form
$\texttt{Four}(l,k_1,m_l, k_2, m_r, k_3, r)$.
A term of the form $\texttt{Four}(l,k_1,m_l, k_2, m_r, k_3, r)$ is a 2-3-4 tree iff
  - $l$, $m_l$, $m_r$, and $r$ are 2-3 trees,
  - $k_l$, $k_m$, and $k_r$ are keys,
  - $l < k_l < m_l < k_m < m_r < k_r < r$,
  - $l$, $m_l$, $m_r$, and $r$ all have the same height.
Nodes of this form are called 4-nodes and the key $k_m$ is called the middle key.
Trees containing 2-nodes, 3-node, and 4-nodes are called 2-3-4 trees.
In order to keep 2-3 trees balanced when deleting keys we use a fifth constructor of the form
$\texttt{One}(t)$.
A term of the form $\texttt{One}(t)$ is a 1-2-3 tree iff $t$ is a 2-3 tree.
The class TwoThreeTree is a superclass for constructing the nodes of 2-3-4 trees.  It has one static variable sNodeCount.  This variable is used to equip all nodes with a unique identifier.  This identifier is used to draw the trees using graphviz.
Every node has a uniques id mID that is stored as a...
Can you write Python code for it?
assistant
#Here is the Python code you requested.

class TwoThreeTree:
    sNodeCount = 0
    
    def __init__(self):
        TwoThreeTree.sNodeCount += 1
        self.mID = TwoThreeTree.sNodeCount
        
    def getID(self):
        return self.mID
        
    def isNil(self):
        return False
    
    def isOne(self):
        return False
    
    def isTwo(self):
        return False
    
    def isThree(self):
        return False
    
    def isFour(self):
        return False
    
    def isTree(self):
        return False
    
    def isMethod(self):
        return False
    
    def insert(self, k):
        return self._ins(k)._restore()._grow()
    
    def delete(self, k):
        return self._del(k)._repair()._shrink()
    
    def _grow(self):
        return self
    
    def _shrink(self):
        return self