def foo():
    print(‘我的函数名作为参数传给高阶函数‘)
def gao_jie1(func):
    print(‘我就是高阶函数1,我接收的参数名是%s‘ %func)
    func()

def gao_jie2(func):
    print(‘我就是高阶函数2,我的返回值是%s‘ %func)
    return func

gao_jie1(foo)
gao_jie2(foo)

#高阶函数应用1:把函数当做参数传给高阶函数
import time
def foo():
    print(‘from the foo‘)

def timmer(func):
    start_time=time.time()
    func()
    stop_time=time.time()
    print(‘函数%s 运行时间是%s‘ %(func,stop_time-start_time))
timmer(foo)
#总结:我们确实为函数foo增加了foo运行时间的功能,但是foo原来的执行方式是foo(),现在我们需要调用高阶函数timmer(foo),改变了函数的调用方式

#高阶函数应用2:把函数名当做参数传给高阶函数,高阶函数直接返回函数名
import time
def foo():
    print(‘from the foo‘)

def timmer(func):
    start_time=time.time()
    return func
    stop_time=time.time()
    print(‘函数%s 运行时间是%s‘ %(func,stop_time-start_time))
foo=timmer(foo)
foo()
#总结:我们确实没有改变foo的调用方式,但是我们也没有为foo增加任何新功能

user_list=[
    {‘name‘:‘alex‘,‘passwd‘:‘123‘},
    {‘name‘:‘linhaifeng‘,‘passwd‘:‘123‘},
    {‘name‘:‘wupeiqi‘,‘passwd‘:‘123‘},
    {‘name‘:‘yuanhao‘,‘passwd‘:‘123‘},
]

current_user={‘username‘:None,‘login‘:False}

def auth_deco(func):
    def wrapper(*args,**kwargs):
        if current_user[‘username‘] and current_user[‘login‘]:
            res=func(*args,**kwargs)
            return res
        username=input(‘用户名: ‘).strip()
        passwd=input(‘密码: ‘).strip()

        for index,user_dic in enumerate(user_list):
            if username == user_dic[‘name‘] and passwd == user_dic[‘passwd‘]:
                current_user[‘username‘]=username

                current_user[‘login‘]=True
                res=func(*args,**kwargs)
                return res
                break
        else:
            print(‘用户名或者密码错误,重新登录‘)

    return wrapper

@auth_deco
def index():
    print(‘欢迎来到主页面‘)

@auth_deco
def home():
    print(‘这里是你家‘)

def shopping_car():
    print(‘查看购物车啊亲‘)

def order():
    print(‘查看订单啊亲‘)

print(user_list)
# index()
print(user_list)
home()

user_list=[
    {‘name‘:‘alex‘,‘passwd‘:‘123‘},
    {‘name‘:‘linhaifeng‘,‘passwd‘:‘123‘},
    {‘name‘:‘wupeiqi‘,‘passwd‘:‘123‘},
    {‘name‘:‘yuanhao‘,‘passwd‘:‘123‘},
]

current_user={‘username‘:None,‘login‘:False}
def auth(auth_type=‘file‘):
    def auth_deco(func):
        def wrapper(*args,**kwargs):
            if auth_type == ‘file‘:
                if current_user[‘username‘] and current_user[‘login‘]:
                    res=func(*args,**kwargs)
                    return res
                username=input(‘用户名: ‘).strip()
                passwd=input(‘密码: ‘).strip()

                for index,user_dic in enumerate(user_list):
                    if username == user_dic[‘name‘] and passwd == user_dic[‘passwd‘]:
                        current_user[‘username‘]=username
                        current_user[‘login‘]=True
                        res=func(*args,**kwargs)
                        return res
                        break
                else:
                    print(‘用户名或者密码错误,重新登录‘)
            elif auth_type == ‘ldap‘:
                print(‘巴拉巴拉小魔仙‘)
                res=func(*args,**kwargs)
                return res
        return wrapper
    return auth_deco


#auth(auth_type=‘file‘)就是在运行一个函数,然后返回auth_deco,所以@auth(auth_type=‘file‘)
#就相当于@auth_deco,只不过现在,我们的auth_deco作为一个闭包的应用,外层的包auth给它留了一个auth_type=‘file‘参数
@auth(auth_type=‘ldap‘)
def index():
    print(‘欢迎来到主页面‘)

@auth(auth_type=‘ldap‘)
def home():
    print(‘这里是你家‘)

def shopping_car():
    print(‘查看购物车啊亲‘)

def order():
    print(‘查看订单啊亲‘)

# print(user_list)
index()
# print(user_list)
home()

import sys,threading,time


class KThread(threading.Thread):

    """A subclass of threading.Thread, with a kill()

    method.



    Come from:

    Kill a thread in Python:

    http://mail.python.org/pipermail/python-list/2004-May/260937.html

    """

    def __init__(self, *args, **kwargs):

        threading.Thread.__init__(self, *args, **kwargs)

        self.killed = False



    def start(self):

        """Start the thread."""

        self.__run_backup = self.run

        self.run = self.__run      # Force the Thread to install our trace.

        threading.Thread.start(self)



    def __run(self):

        """Hacked run function, which installs the

        trace."""

        sys.settrace(self.globaltrace)

        self.__run_backup()

        self.run = self.__run_backup



    def globaltrace(self, frame, why, arg):

        if why == ‘call‘:

          return self.localtrace

        else:

          return None



    def localtrace(self, frame, why, arg):

        if self.killed:

          if why == ‘line‘:

            raise SystemExit()

        return self.localtrace



    def kill(self):

        self.killed = True



class Timeout(Exception):

    """function run timeout"""



def timeout(seconds):

    """超时装饰器，指定超时时间

    若被装饰的方法在指定的时间内未返回，则抛出Timeout异常"""

    def timeout_decorator(func):

        """真正的装饰器"""



        def _new_func(oldfunc, result, oldfunc_args, oldfunc_kwargs):

            result.append(oldfunc(*oldfunc_args, **oldfunc_kwargs))



        def _(*args, **kwargs):

            result = []

            new_kwargs = { # create new args for _new_func, because we want to get the func return val to result list

                ‘oldfunc‘: func,

                ‘result‘: result,

                ‘oldfunc_args‘: args,

                ‘oldfunc_kwargs‘: kwargs

            }

            thd = KThread(target=_new_func, args=(), kwargs=new_kwargs)

            thd.start()

            thd.join(seconds)

            alive = thd.isAlive()

            thd.kill() # kill the child thread

            if alive:

                raise Timeout(u‘function run too long, timeout %d seconds.‘ % seconds)

            else:

                return result[0]

        _.__name__ = func.__name__

        _.__doc__ = func.__doc__

        return _

    return timeout_decorator


@timeout(5)

def method_timeout(seconds, text):

    print(‘start‘, seconds, text)

    time.sleep(seconds)

    print(‘finish‘, seconds, text)

    return seconds


method_timeout(6,‘asdfasdfasdfas‘)