005 Metaclass 05: Singleton Class using customized MetaClass

020 decorator in python

012 Magic or Dunder Methods 07: __getattr__, __setattr__, __delattr__

011 Magic or Dunder Methods 06: __iadd__ and few other magic methods

010 Magic or Dunder Methods 05: __floor__, __ceil__, __trunc__(floor(), ceil() & trunc() of math)

009 Magic or Dunder Methods 04: __abs__, __round__, __invert__ (abs(), round() and ~ operator)

008 Magic or Dunder Methods 03: __pos__, __neg__ (Unary + and - operators)

007 Magic or Dunder Methods 02: __new__ , __init__ , __del__