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好像这样更好理解一点

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def back_1(): n = 1 while True: yield n n = n + 1

def back_3(): it = back_1() while True: it = filter(lambda x: str(x) == str(x)[::-1], it) n = next(it) yield n

for t in back_3(): if t < 200: print(t) else: break


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