python 装饰器demo

x = 1
def funx():
    x = 10
    print(x)
funx()
print(x)


x = 1
def funx():
    print(x)
funx()
print(x) 



x = 1
def funx():
    def func1():
        print(x)
    func1()
funx()
print(x) 

10
1
1
1
1
1

def outer():
    def inner():
        pass
    return inner

s = outer()
print(s)

<function outer.<locals>.inner at 0x1058c60d0>

def index():
    print("index func")

def outer(index):
    s = index
    s()

outer(index)

index func

def outer():
    def inner():
        print("inner func excuted")
    inner()  # 调用执行inner()函数
    print("outer func excuted")
outer()  # 调用执行outer函数

inner func excuted
outer func excuted

x = 1
def outer():

    def inner():
        print("x=%s" %x)  # 引用了一个非inner函数内部的变量
        print("inner func excuted")
    inner()  # 执行inner函数
    print("outer func excuted")

outer()

x=1
inner func excuted
outer func excuted

def outer():
    x = 1
    def inner():
        print("x=%s" % x)
        print("inner func excuted")
    print("outer func excuted")
    return inner  # 返回内部函数名
outer()()

outer func excuted
x=1
inner func excuted

def outer():
    x = 1
    def inner():
        print("x=%s" %x)
        print("inner func excuted")
    inner()
    print("outer func excuted")

outer()

x=1
inner func excuted
outer func excuted

def outer():
    x = 1
    y = 2
    def inner():
        print("x= %s" %x)
        print("y= %s" %y)

    print(inner.__closure__)
    return inner

outer()

(<cell at 0x102d6ea98: int object at 0x1009e0c80>, <cell at 0x102d6ebe8: int object at 0x1009e0ca0>)

class Foo(object):
    def __init__(self, func):
        self._func = func
    def __call__(self):
        print(‘class decorator runing‘)
        self._func()
        print(‘class decorator ending‘)

@Foo
def bar():
    print(‘bar‘)

bar()

class decorator runing
bar
class decorator ending

class Foo(object):
    def __init__(self):
        pass
    def __call__(self, func):
        def _call(*args, **kw):
            print(‘class decorator runing‘)
            return func(*args, **kw)
        return _call

class Bar(object):
    @Foo()
    def bar(self, test, ids):   # bar = Foo()(bar)
        print(‘bar‘)

Bar().bar(‘aa‘, ‘ids‘)

class decorator runing
bar

import time
import random
def timmer(func):
    def wrapper():
        start_time = time.time()
        func()
        stop_time =time.time()
        print(‘run time is %s‘ %(stop_time - start_time))
    return wrapper

def auth(func):
    def deco():
        name = input(‘name: ‘)
        password = input(‘password: ‘)
        if name == ‘egon‘ and password == ‘123‘:
            print(‘login successful‘)
            func()  # wrapper()
        else:
            print(‘login err‘)
        print("hahha")
    return deco

@auth  # index = auth(timmer(index))
@timmer  # index = timmer(index)
def index():
    time.sleep(3)
    print(‘welecome to index page‘)
index()

name: egon
password: 123
login successful
welecome to index page
run time is 3.005250930786133
hahha

import time
def outer(func):  # 将index的地址传递给func
    def inner(*args, **kwargs):
        start_time = time.time()
        func(*args, **kwargs)   # fun = index  即func保存了外部index函数的地址
        end_time = time.time()
        print("运行时间为%s"%(end_time - start_time))
    return inner  # 返回inner的地址

@outer
def dd(a):
    print("haha -> ",a)

dd("xiaoming")

haha ->  xiaoming
运行时间为5.626678466796875e-05

import time, random

def outer(func):  # 将index的地址传递给func
    def inner():
        start_time = time.time()
        func()   # fun = index  即func保存了外部index函数的地址
        end_time = time.time()
        print("运行时间为%s"%(end_time - start_time))
    return inner  # 返回inner的地址

def index():
    time.sleep(random.randrange(1, 5))
    print("welcome to index page")

@outer
def indexone():
    time.sleep(random.randrange(1, 5))
    print("welcome to index page")

index = outer(index)  # 这里返回的是inner的地址，并重新赋值给index
index()

print("\n")

indexone()

welcome to index page
运行时间为4.00538182258606


welcome to index page
运行时间为1.0052530765533447

import time, random

def outer(func):  # 将index的地址传递给func
    def inner(a):
        start_time = time.time()
        func(a)   # fun = index  即func保存了外部index函数的地址
        end_time = time.time()
        print("运行时间为%s"%(end_time - start_time))
    return inner  # 返回inner的地址

def index(b):
    time.sleep(random.randrange(1, 5))
    print("welcome to index page",b)

@outer
def indexone(a):
    time.sleep(random.randrange(1, 5))
    print("welcome to index page",a)

index = outer(index)  # 这里返回的是inner的地址，并重新赋值给index
index("bb")

print("\n")

indexone("aa")

welcome to index page bb
运行时间为3.0013160705566406


welcome to index page aa
运行时间为4.002547264099121

import time
import random
def timmer(func):
    def wrapper(*args,**kwargs):
        print("kk")
        print(*args)
        start_time = time.time()
        res=func(*args,**kwargs) #res来接收home函数的返回值
        stop_time=time.time()
        print(‘run time is %s‘ %(stop_time-start_time))
        return res
    return wrapper

@timmer
def home(name):
    time.sleep(random.randrange(1,3))
    print(‘welecome to %s HOME page‘ %name)
    return 123123123123123123123123123123123123123123

print(home("haha"))

kk
haha
welecome to haha HOME page
run time is 2.001023054122925
123123123123123123123123123123123123123123