#!/usr/bin/env python

class bla (list):
   def __init__ (self, sequenz):
      list.__init__ (self, sequenz)

   def __iter__ (self):
      for i in list.__iter__(self):
         yield i + 3

if __name__=='__main__':
   f = bla ([1,2,3,4,5])

   for b in f:
      print b