human
I am working on the file "Python/Chapter-08/Huffman.ipynb".
The first task is:
The class Leaf represents a leaf of the form $\texttt{Leaf}(c, f)$.  It maintains two member variables.
  - $c$ represents the character that is encoded.  This character is stored in the member variable mCharacter.
  - $f$ represents the number of occurrences of the character $c$ in the string $s$ that is to be encoded and is stored in the member variable mFrequancy.
Can you write Python program for it?
assistant
#Here is the Python program you requested.

class Leaf(CodingTree):
    def __init__(self, c, f):
        CodingTree.__init__(self)
        self.mCharacter = c
        self.mFrequency = f
        
    def count(self):
        return self.mFrequency
    
    def cost(self):
        return 0
    
    def __str__(self):
        return _make_string(self, ['mCharacter', 'mFrequency'])
    
    def __lt__(self, other):
        if isinstance(other, Node):
            return True
        return self.mCharacter < other.mCharacter