human
I am working on the file "A First Class.ipynb".
The first task is:
Lets start though, by completing our function from the last chapter.  We'll morph it into the method from_cyclic and have it it build us a new P-object.  Lets do that by refactoring, having the P object inherit from another class:
Can you write Python code for it?

What is a the Python code you requested?
assistant
#Here is the Python code you requested.

class P_base:
    """
    A Permutation
    
    self._code: a dict, is a mapping of iterable elements 
    to themselves in any order.
    """   

    def __init__(self, iterable = ascii_lowercase + ' '): # default domain
        """
        start out with Identity
        """  
        try:
            seq1 = iter(iterable)
            seq2 = iter(iterable)
        except:
            raise TypeError

        self._code = dict(zip(seq1, seq2))
 
    def __getitem__(self, key):
        return self._code.get(key, None)
               
    def __repr__(self):
        return "P class: " + str(tuple(self._code.items())[:3]) + "..."

    def __mul__(self, other): 
        """
        look up my keys to get values that serve
        as keys to get others "target" values
        """
        new_code = {}
        for c in self._code:  # going through my keys
            target = other._code[ self._code[c] ]
            new_code[c] = target
        new_P = P() 
        new_P._code = new_code
        return new_P
   
    def __eq__(self, other):
        """
        are these permutation the same?  
        Yes if self._cod==e  other._code
        """
        return self._code == other._code
    
class P(P_base):  # first use of inheritance
        
    def __invert__(self):
        """
        create new P with reversed dict
        """
        newP = P()
        newP._code = dict(zip(self._code.values(), self._code.keys()))
        return newP
    
    def shuffle(self):
        """
        return a random permutation of this permutation
        """
        # use shuffle
        # something like
        the_keys = list(self._code.keys()) # grab keys
        shuffle(the_keys)  # shuffles 'em
        newP = P()
        # inject dict directly...
        newP._code = dict(zip(self._code.keys(), the_keys))
        return newP
        
    def encrypt(self, plain):
        """
        turn plaintext into cyphertext using self._code
        """
        output = ""  # empty string
        for c in plain:
            output =...