平均数例子

def add3num(a, b, c):return a+b+c
def average3num(a, b, c):sumresult = add3num(a, b, c)averesult = sumresult/3.0return averesult
result = average3num(10, 20, 3)
print('average is %d'%result)print()括号中双引号中的内容会原封不动的输出来，要想输出数，前面用%然后加上要输出的结果，便是要输出的值