class StepValueError(ValueError): pass

class Iterator: def init(self, start, stop, step): self.start = start self.stop = stop self.step = step self.pointer = start

def __iter__(self):
    return self

def __next__(self):
    if self.step == 0:
        raise StepValueError("Step value cannot be zero")
    if (self.step > 0 and self.pointer >= self.stop) or (self.step < 0 and self.pointer <= self.stop):
        raise StopIteration
    current = self.pointer
    self.pointer += self.step
    return current

Пример использования

iterator = Iterator(1, 10, 2) for num in iterator: print(num)