这为啥不行，每传入一个数，就给y加一，为什么返回的时候y一直是0
def average(*args):
sum=0.0
y=0
if args == 0:
print 0
else:
for x in args:
sum+=x
y+=1
return sum/y
print average()
print average(1, 2)
print average(1, 2, 2, 3, 4)
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def average(*args):
sum=0.0
y=0
if args == 0:
print 0
else:
for x in args:
sum+=x
y+=1
return sum/y
print average()
print average(1, 2)
print average(1, 2, 2, 3, 4)
2018-12-29
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