PyTeleAbs, Python 3

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#python 3.6.9

#PyTeleAbs: example of abstract class,abstract method and private method
#this code is created by Rezaul Hoque on April 11,2022;
#contact: jewelmrh@yahoo.com; Dhaka,   Bangladesh,https://rezaulhoque.wordpress.com;https:hoquestake.blogspot.com
#note: codes shared by Rezaul Hoque on rextester are not for sale; they are created and shared to facilitate the algorithm learning process; many like Hoque use this platform to practice programming ;Rezaul hopes his contribution helps others to fine tune their learning;
from abc import ABC,abstractmethod

class Person(ABC):
    
      def __init__(self,first, last,num):
            self.first = first
            self.last = last
            self.num=num
      @property
      def filast(self):
            return f"{self.first} \t {self.last}\t{self.num}"
   
      @abstractmethod
      def category(self):
                    pass
        
 
class Professional(Person):
    
     def __init__(self,first,last,num,cat):
          super().__init__(first,last,num)
          self.cat = cat

def category(self):
            
            return self.cat

class Personal(Person):
    
    def __init__(self,first,last,num,cat):
          super().__init__(first,last,num)
          self.cat = cat

def category(self):
            return self.cat

class Detail:
       def __init__(self):
                self.booklist= [ ]

def  add(self,tel):
                self.booklist.append(tel)
         #private method
       def __banner(self):
              print("Example: Abstract class,abstract method and private method")
              print("~"*35)
              print("~"*35)
              print("name(first,last) number  category \n")
       def  display(self):
                for i in self.booklist:
##important:string objects are not callable like i.filast();they should be called like i.filast
                     print(f"{i.filast}\t{i.category()}")

if __name__ == '__main__':

det = Detail()
       det._Detail__banner()
       det.add(Professional('hh','cc',4321,'former'))
       det.add(Professional('tt','nn',000,'current'))
       det.add(Personal('yy','mm',321,'personal'))
       det.display()

[ + ] Show input
Absolute running time: 0.15 sec, cpu time: 0.02 sec, memory peak: 8 Mb, absolute service time: 0,22 sec