def back_1(): n = 1 while True: yield n n = n + 1
def back_2(x): return str(x) == str(x)[::-1]
def back_3(): it = back_1() while True: n = next(it) yield n it = filter(back_2, it)
for t in back_3(): if t < 200: print(t) else: break
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一块兢兢业业的手表
def back_1(): n = 1 while True: yield n n = n + 1
def back_2(x): return str(x) == str(x)[::-1]
def back_3(): it = back_1() while True: n = next(it) yield n it = filter(back_2, it)
for t in back_3(): if t < 200: print(t) else: break