请问一下，这样写为什么不对啊
sum = 0
x = 1
n = 1
while True:
y = 2^(n-1)
sum = sum + y
n = n + 1
if n > 20:
break
print sum
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sum = 0
x = 1
n = 1
while True:
y = 2^(n-1)
sum = sum + y
n = n + 1
if n > 20:
break
print sum
2018-11-24
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