break退出循环
sum = 0
x = 1
n = 1
while True:
x=2**(n-1)
n=n+1
sum=sum+x
if n>19
break
print sum
请问错在哪
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sum = 0
x = 1
n = 1
while True:
x=2**(n-1)
n=n+1
sum=sum+x
if n>19
break
print sum
请问错在哪
2016-09-25
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