大佬帮我看看这有什么问题，谢谢
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
2019-08-27
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