The Iterator Protocol : Iterator « Class « Python Tutorial

1. Python Tutorial
2. Class
3. Iterator

class Fibs:
    def __init__(self):
        self.a = 0
        self.b = 1
    def next(self):
        self.a, self.b = self.b, self.a+self.b
        return self.a
    def __iter__(self):
        return self

fibs = Fibs()
for f in fibs:
   if f > 100:
      print f
      break