class PrimeNumbers(object):

    def __init__(self, max):
        if max < 2:
            raise ValueError("max should be >= 2")
        self.max = max
        self.cur = 2

     def __next__(self):
        while self.cur <= max:
            for i in range(2, self.cur):
                if self.cur % i == 0:
                    break
            else:
                return self.cur

            self.cur += 1

     def __iter__(self):
        return self


if __name__ == '__main__':
    for i in PrimeNumbers(100):
        print(i)