为何下面这个无法运行？ 显示IdentationError：unexpected indent
sum = 0
x = 1
n = 1
while True:
sum=sum+x
x=x*2
n=n+1
if n>20:
break
print sum
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sum = 0
x = 1
n = 1
while True:
sum=sum+x
x=x*2
n=n+1
if n>20:
break
print sum
2016-04-19
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