求问哪里有问题？感觉逻辑对啊
sum = 0 x = 1 n = 1 while True: sum = sum + x
x = 2**n n = n+1 if n > 19: break
print sum
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sum = 0 x = 1 n = 1 while True: sum = sum + x
x = 2**n n = n+1 if n > 19: break
print sum
2017-07-10
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