运行时怎么是空白的呀？
def power(x, n=2):
s = 1
while n > 0:
n = n - 1
s = s * x
return s
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def power(x, n=2):
s = 1
while n > 0:
n = n - 1
s = s * x
return s
2016-12-19
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