装饰器

将原函数封装到另外一个函数里边

def time_cont(unc):
    def time1(*args,**kwargs):
        import time
        start=time.time()
        unc(*args,**kwargs)
        end=time.time()
        print(end-start)
    return time1
def func(f,n=3,a=0,b=1):
    if f==1:return a
    if f==2:return b
    if n>=f:
        return a+b
    r=func(f,n=n+1,a=b,b=a+b)
    return r
def fib(n):
    if n==1:
        return 0
    if n==2:
        return 1
    else:return fib(n-1)+fib(n-2)
@time_cont
def main1():
    ret=fib(36)
    print(ret)
@time_cont
def main2():
    ret = func(200)
    print(ret)

main2()
main1()
两种方法性能比较