我的代码为什么会错？
sum = 0
x = 1
n = 1
while True:
sum = sum + x
x = n * 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 = n * 2
n = n + 1
if n > 20
break
print sum
2017-04-21
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