"""
 Thinking about project euler #55
 in python class, Nov 4 2010
"""

from doctest import testmod

class Number:
  """
  Represent a number and the operations appropriate
  for this problem, namely flipping, palindrom, Lychrel chain, etc
  """
  def __init__(self, n):
    self.n = n
    self._flip = None
  def isPalindrome(self):
    return self.flip() == self.n
  def nextLychrel(self):
    return self.n + self.flip() 
  def flip(self):
    """ Return base 10 flipped right-to-left version of this number.
        >>> threefour = Number(34)
        >>> threefour.flip()
        43
    """
    if not self._flip:
      digits = list(str(self.n))
      digits.reverse()
      self._flip = int(''.join(digits))
    return self._flip

if __name__ == '__main__':
  testmod()