python中的函数

def sum(a,b):
    c=a+b
    return c
a=sum(5,6)
print(a)
def fun(num):
    odd=[]
    even=[]
    for i in num:
        if i%2:
            odd.append(i)
        else:
            even.append(i)
    return odd,even
print(fun([2,3,4,5,6,7,8,9]))

def fib(n):
    if n==1:
        return 1
    elif n==2:
        return 1
    else:
        return fib(n-1)+fib(n-2)
print(fib(6))