Python高级特性之闭包与装饰器实例详解

def func01():
  print("func01 is show")
test = func01
print(func01)
print(test)
test()

def func_out(rate):
  def func_in(money):
    print(rate * money)
  return func_in
usa_money = func_out(0.7)
usa_money(100)
usa_money(200)

# 在不改变函数的原有代码的前提下 给函数添加新的功能
def func_out(func):
  def func_in():
    print("验证")
    func()
  return func_in
@func_out
def login():
  print("登录")
# 有装饰器 装饰器下面正好是一个函数
# login = func_out(login)  重点
login()

login = func_out(login)

login = func_out(login) = func_in

print('验证')
func() # func指原login函数的地址

def func_out(func):
  def func_in():
    # ret = func()
    #  def login():
    #    return 100
    return func()
  return func_in
@func_out
def login():
  return 100
# login() ==> func_in()
# func ==> 原始的login
f = login()
print(f)

def func_out(func):
  def func_in(a):
    func(a)
  return func_in
@func_out
def login(a):
  print(a)
# login() ==> func_in()
# func ==> 原始的login
login(10)

def func_out(func):
  def func_in(*args,**kwargs):
    return func(*args,**kwargs)
  return func_in
@func_out
def login(*args,**kwargs):
  print(args)
  print(kwargs)
# login() ==> func_in()
# func ==> 原始的login
login(10,20,age = "17",name="123")

class Foo(object):
  def __init__(self, func):
    self.func = func
  def __call__(self):
    print("验证")
    self.func()
@Foo
def login():
  print("登录")
# login = Foo(login)
login()

def func_out01(func01):
  print("func_out01 is show")
  def func_in01():
    print("func_in01 is show")
    func01()
  return func_in01
def func_out02(func02):
  print("func_out02 is show")
  def func_in02():
    print("func_in02 is show")
    func02()
  return func_in02
@func_out02 # login = func_out02(login)
@func_out01 # login = func_out01(login)
def login():
  print("login is show")
login()

def route(参数):
  print(参数)
  def func_out(func):
    def func_in():
      func()
    return func_in
  return func_out
@route(参数)
def index():
  return "index is show"