这里加了一个else 为什么不行呢？
def average(*args):
sum= 0.0
if len(args)==0:
return sum
else
for x in args:
sum=sum+x
return sum/len(args)
print average()
print average(1, 2)
print average(1, 2, 2, 3, 4)
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def average(*args):
sum= 0.0
if len(args)==0:
return sum
else
for x in args:
sum=sum+x
return sum/len(args)
print average()
print average(1, 2)
print average(1, 2, 2, 3, 4)
2018-06-25
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