这个为什么是错的？
sum = 0
x = 1
n = 1
while True:
if n>20:
break
sum = sum + x
x = x * 2
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 = x * 2
n = n+1
print sum
2019-06-24
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