TI/Ciąg Arytmetyczny

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Wed Apr 10 10:36:23 2019

@author: tgub
"""

class CiagA():
    
    #licznik obiektów klasy CiagA
    licznik=0
    
    @staticmethod
    def kwadratowa(x): 
        return x*x
    
    @classmethod
    def ilenas(cls): 
        return cls.licznik
    
    def __init__(self,a0,r):
        self.__a0=a0
        self.__r=r
        CiagA.licznik+=1
        
    def __del__(self):
        print('AAAAA umieram.......')
        CiagA.licznik-=1
        
    @property    
    def a0(self):
        return self.__a0
    
    @property    
    def r(self):
        return self.__r    
    
    def __getitem__(self,key):
        if key<0: raise KeyError
        return self.a0+key*self.r
    
    def __add__(self,other): 
        return CiagA(self.a0+other.a0,self.r+other.r)
    
    def __str__(self):  
        return 'Ciag Arytmetyczny o a0='+str(self.a0)+' r='+str(self.r)
    
    def __repr__(self): 
        return self.__str__()

class CiagAE(CiagA):
    
    #licznik obiektów klasy CiagAE
    licznik=0
    
    def __init__(self,a0,r=None):
        if isinstance(a0,CiagA):
            r=a0.r
            a0=a0.a0
        super().__init__(a0,r)
        CiagAE.licznik+=1
        self.__slownik={}
        
    def __del__(self):
        print('AEAEAEAEAE umieram.......')
        CiagAE.licznik-=1
        super().__del__()
    
    def __getitem__(self,key):
        try:
            return self.__slownik[key]
        except KeyError:
            return super().__getitem__(key)
    
    def __setitem__(self,key,value): 
        self.__slownik[key]=value
    
    def __str__(self):
        return super().__str__()+' oraz zmiany opisane slownikiem '+str(self.__slownik)
    
    def __add__(self,other): 
        temp=CiagAE(self.a0+other.a0,self.r+other.r)
        for key in self.__slownik.keys():
            temp[key]=self[key]+other[key]
        try:
            for key in other.__slownik.keys():
                temp[key]=self[key]+other[key]
        except AttributeError:
            pass
        return temp
    
y=CiagAE(4,20)
x=CiagA(1,2)
y[1]=1000