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# Python 3 : Iterator class CountDown: def __init__(self, top: int): self.current = top + 1 def __iter__(self) -> 'CountDown': return self def __next__(self) -> int: self.current -= 1 if self.current < 0: raise StopIteration else: return self.current if __name__ == '__main__': c1 = CountDown(3) print(type(c1)) # for i in c1: print(i) # 3 2 1 0 c2 = CountDown(3) print(next(c2)) # 3 print(next(c2)..

# Python 3 : Iterator b = {1, 2, 3}b_iter = b.__iter__()print(type(b_iter)) # print(b_iter.__next__()) # 1print(b_iter.__next__()) # 2print(b_iter.__next__()) # 3print(b_iter.__next__()) # StopIteration

# Python 3 : Iterator a = [1, 2, 3]a_iter = iter(a)print(type(a_iter)) # print(next(a_iter)) # 1print(next(a_iter)) # 2print(next(a_iter)) # 3print(next(a_iter)) # StopIteration