参考一下
第一步：简单实现装饰器
def login(func):
print("in Login")
return func
def tv(name):
print("{name} in TV".format(name name))
tv login(tv)
tv(&39;Jack&39;)
out:
in Login
Jack in TV
第二步：同上
效果相同，但是使用的是@login
def login(func):
print("in Login")
return func
@login
def tv(name):
print("{name} in TV".format(name name))
tv login(tv)
tv(&39;Jack&39;)
out:
in Login
Jack in TV
但是出现问题，注销最后的执行语句仍有输出，原因在于@login的调用，即@login相当于执行了tv login(tv) 所以才有输出。
def login(func):
print("in Login")
return func
@login
def tv(name):
print("{name} in TV".format(name name))
tv login(tv)
tv(&39;Jack&39;)
out:
in Login
如下调整可解决
def login(func):
def inner(arg):
print("in Login")
return func
func(arg)
return inner
@login
def tv(name):
print("{name} in TV".format(name name))
tv login(tv)
tv(&39;Jack&39;)
out:
in Login
Jack in TV
简单的递归函数
!/usr/bin/env python
递归函数
def calc(num):
print("Number:",num)
if num/2 > 1:
calc(num/2)
print("After Number:",num/2)
calc(10)
Number: 10
Number: 5.0
Number: 2.5
Number: 1.25
After Number: 1.25
After Number: 2.5
After Number: 5.0
递归实现斐波那契数列
Fibonacci sequence
F[n]F[n-1]+F[n-2](n>2,F[0]1,F[1]1)
斐波那契数列：1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, ...
fibList [1,1]
def getFib(fibList):
print(fibList)
if fibList[-1] + fibList[-2] < 300:
fibList.append(fibList[-1] + fibList[-2])
getFib(fibList)
pass
pass
getFib(fibList)
print("[FINAL]:",fibList)
[1, 1]
[1, 1, 2]
[1, 1, 2, 3]
[1, 1, 2, 3, 5]
[1, 1, 2, 3, 5, 8]
[1, 1, 2, 3, 5, 8, 13]
[1, 1, 2, 3, 5, 8, 13, 21]
[1, 1, 2, 3, 5, 8, 13, 21, 34]
[1, 1, 2, 3, 5, 8, 13, 21, 34, 55]
[1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89]
[1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144]
[1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233]
[FINAL]: [1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233]