用幂运算的方式呢？问题出在哪里了？求助
sum = 0
x = 1
n = 1
while True:
if n>20:
break
sum=sum+x
x=2^n
n=n+1
print sum
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sum = 0
x = 1
n = 1
while True:
if n>20:
break
sum=sum+x
x=2^n
n=n+1
print sum
2014-12-03
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