请问这样为什么结果错
sum = 0
x = 1
n = 1
while True:
sum=sum+x
n=n+1
x=2^(n-1)
if n>20:
break
print sum
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sum = 0
x = 1
n = 1
while True:
sum=sum+x
n=n+1
x=2^(n-1)
if n>20:
break
print sum
2018-09-13
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