import time
def timmer(func): #func=test
def wrapper():
start_time=time.time()
res=func() #就是在运行test()
stop_time = time.time()
print('运行时间是%s' %(stop_time-start_time))
return res
return wrapper
@timmer #test=timmer(test)
def test():
time.sleep(3)
print('test函数运行完毕')
return '这是test的返回值'
res=test() #就是在运行wrapper
print(res)
import time
def timmer(func): #func=test1
def wrapper(*args,**kwargs): #test('linhaifeng',age=18) args=('linhaifeng') kwargs={'age':18}
start_time=time.time()
res=func(*args,**kwargs) #就是在运行test() func(*('linhaifeng'),**{'age':18})
stop_time = time.time()
print('运行时间是%s' %(stop_time-start_time))
return res
return wrapper
# @timmer #test=timmer(test)
def test(name,age):
time.sleep(3)
print('test函数运行完毕,名字是【%s】 年龄是【%s】' %(name,age))
return '这是test的返回值'
@timmer
def test1(name,age,gender):
time.sleep(1)
print('test1函数运行完毕,名字是【%s】 年龄是【%s】 性别【%s】' %(name,age,gender))
return '这是test的返回值'
# res=test('linhaifeng',age=18) #就是在运行wrapper
# # print(res)
# test1('alex',18,'male')
test1('alex',18,'male')
# def test2(name,age,gender): #test2(*('alex',18,'male','x','y'),**{})
# #name,age,gender=('alex',18,'male','x','y')
# print(name)
# print(age)
# print(gender)
#
# def test1(*args,**kwargs):
# test2(*args,**kwargs) #args=('alex',18,'male','x','y') kwargs={}
#
# # test2('alex',18,gender='male')
#
# test1('alex',18,'male')
user_list=[
{'name':'alex','passwd':'123'},
{'name':'linhaifeng','passwd':'123'},
{'name':'wupeiqi','passwd':'123'},
{'name':'yuanhao','passwd':'123'},
]
current_dic={'username':None,'login':False}
def auth(auth_type='filedb'):
def auth_func(func):
def wrapper(*args,**kwargs):
print('认证类型是',auth_type)
if auth_type == 'filedb':
if current_dic['username'] and current_dic['login']:
res = func(*args, **kwargs)
return res
username=input('用户名:').strip()
passwd=input('密码:').strip()
for user_dic in user_list:
if username == user_dic['name'] and passwd == user_dic['passwd']:
current_dic['username']=username
current_dic['login']=True
res = func(*args, **kwargs)
return res
else:
print('用户名或者密码错误')
elif auth_type == 'ldap':
print('鬼才特么会玩')
res = func(*args, **kwargs)
return res
else:
print('鬼才知道你用的什么认证方式')
res = func(*args, **kwargs)
return res
return wrapper
return auth_func
@auth(auth_type='filedb') #auth_func=auth(auth_type='filedb')-->@auth_func 附加了一个auth_type --->index=auth_func(index)
def index():
print('欢迎来到京东主页')
@auth(auth_type='ldap')
def home(name):
print('欢迎回家%s' %name)
#
@auth(auth_type='sssssss')
def shopping_car(name):
print('%s的购物车里有[%s,%s,%s]' %(name,'奶茶','妹妹','娃娃'))
# print('before-->',current_dic)
# index()
# print('after--->',current_dic)
# home('产品经理')
shopping_car('产品经理')
装饰器预演
import time
def timmer(func):
def wrapper(*args,**kwargs):
start_time=time.time()
res=func(*args,**kwargs)
stop_time = time.time()
print('函数运行时间是%s' %(stop_time-start_time))
return res
return wrapper
@timmer
def cal(l):
res=0
for i in l:
time.sleep(0.1)
res+=i
return res
res=cal(range(20))
print(res)
装饰器
import time
def cal(l):
start_time=time.time()
res=0
for i in l:
time.sleep(0.1)
res+=i
stop_time = time.time()
print('函数的运行时间是%s' %(stop_time-start_time))
return res
print(cal(range(100)))
def index():
pass
def home():
pass
装饰器实现
import time
def timmer(func): #func=test
def wrapper():
# print(func)
start_time=time.time()
func() #就是在运行test()
stop_time = time.time()
print('运行时间是%s' %(stop_time-start_time))
return wrapper
@timmer #test=timmer(test)
def test():
time.sleep(3)
print('test函数运行完毕')
test()
# res=timmer(test) #返回的是wrapper的地址
# res() #执行的是wrapper()
# test=timmer(test) #返回的是wrapper的地址
# test() #执行的是wrapper()
# @timmer 就相当于 test=timmer(test)
生成器相关的yield
# age=10
# res=True if age > 10 else False
#
# l=['a' for i in range(10)]
# g_l=('a' for i in range(10))
def test():
for i in range(4):
yield i
t=test()
# for i in t:
# print(i)
#
# t1=(i for i in t)
# print(list(t1))
# t1=(i for i in t)
# t2=(i for i in t1) #这里为空 因为生成器一次就完蛋了 他并会保存里面的值
# print(list(t1))
# print(list(t2))