为什么我的结果是2097150
sum = 0
x = 1
n = 1
while True:
n = n + 1
x = x * 2
sum = sum + x
if n > 20:
break
print sum
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sum = 0
x = 1
n = 1
while True:
n = n + 1
x = x * 2
sum = sum + x
if n > 20:
break
print sum
2016-12-14
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