text: #!/usr/bin/python3
  ''' square with a method for finding the area  '''
  
  
  class Square:
      def __init__(self, size=0):
          if not isinstance(size, int):
              raise TypeError("size must be an integer")
          elif size < 0:
              raise ValueError("size must be >= 0")
          elif size is not None:
              self.__size = size
  
      def area(self):
          if self.__size is not None:
              return self.__size * self.__size
          else:
              return None
  