各位大神，输出后和答案一样，但是设置的条件不一样，能否看看我这样对吗？
sum = 0
x = 1
n = 1
while True:
sum = sum + x
x = 2**n
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 = 2**n
n = n + 1
if n > 20:
break
print sum
2019-02-21
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