human
I am working on the file "Python/Chapter-07/2-3-Trees-Visualization.ipynb".
The first task is:
The class Two represents a 2-node of the form $\texttt{Two}(l, k, r)$.  It manages three member variables:
  - mLeft  is the left subtree $l$,
  - mKey   is the key that is stored at this node,
  - mRight is the right subtree $r$.
Can you write Python program for it?
assistant
#Here is the Python program you requested.

class Two(TwoThreeTree):
    def __init__(self, left, key, right):
        TwoThreeTree.__init__(self)
        self.mLeft  = left
        self.mKey   = key
        self.mRight = right
        
    def isTwo(self):
        return True

    def __str__(self):
        return self._make_string(['mLeft', 'mKey', 'mRight'])