human
What is a the Python code you requested given the following:
I am working on the file "Python/Chapter-06/Trie.ipynb".
The first task is:
Tries
A trie is a data structure that implements the abstract data type of a dictionary in the case that the keys are strings.
The set $\mathbb{T}$ of all tries is defined inductively using the constructor 
$$ \texttt{Trie}: \texttt{Value} \times \texttt{List}(\Sigma) \times\texttt{List}(\mathbb{T}) \rightarrow \mathbb{T}. $$ 
Here $\Sigma$ is the alphabet, i.e. the set of characters.
The inductive definition of the set $\mathbb{T}$ has only a single clause: If
  - $v \in \texttt{Value} \cup {\Omega}$,
  - $C!s = [c_1, \cdots, c_n] \in \texttt{List}(\Sigma)$ is a list of different characters of length $n$ and
  - $T!s = [t_1, \cdots, t_n] \in \texttt{List}(\mathbb{T})$ is a list of tries of the same length $n$, 
then we have 
$$ \texttt{Trie}(v, C!s, T!s) \in \mathbb{T}. $$  
The class Trie defined below implements tries.  An object $t$ of the class Trie represents the trie
$$ \texttt{Trie}(t.\texttt{mValue}, t.\texttt{mChars}, t.\texttt{mTries}). $$
The constructor __init__ creates an empty trie.
Can you write Python code for it?
assistant
#Here is the Python code you requested.

class Trie:
    def __init__(self):
        self.mValue  = None
        self.mChars  = []
        self.mTries  = []
        self.mParent = '' # only used by graphviz