闭包函数
def f1(x):
def f2():
print(x)
return f2
f = f1(5) # f-->f2,x=5
f() # f()-->f2(),x=5 # 5
f() # 5
f3 = f1(3) # f-->f2,x=3
f3() # f()-->f2(),x=3 # 3
f3() # 3
- 把内部定义的变量放到内部的函数中,让两者一起返回出去
装饰器
def deco(func):
def wrapper(*args,**kwargs): # 赋值后的time_sleep
res = func(*args,**kwargs) # 真正的time_sleep
return res
return wrapper
@deco # time_sleep(赋值后的) = deco(time_sleep(真正的))
def time_sleep(name,age,height=168):
print(name,age,height)
return 123
time_sleep('CHH','22')
无参装饰器
is_login_dict = {'username': None}
def login_deco(func):
def wrapper(*args, **kwargs): # 赋值后的time_sleep
if not is_login_dict['username']:
username = input('请输入你的用户名》》》').strip()
if username != 'fanping':
print('非法登录')
return
is_login_dict['username'] = username
res = func(*args, **kwargs) # 真正的time_sleep
return res
else:
res = func(*args, **kwargs) # 真正的time_sleep
return res
return wrapper
@login_deco
def shopping():
print('from shopping')
@login_deco
def withdraw():
print('from withdraw')
有参装饰器
is_login_dict = {'username': None}
def auth(origin):
def login_deco(func):
def wrapper(*args, **kwargs): # 赋值后的time_sleep
if origin == 'file':
if not is_login_dict['username']:
username = input('请输入你的用户名》》》').strip()
if username != 'fanping':
print('非法登录')
return
is_login_dict['username'] = username
res = func(*args, **kwargs) # 真正的time_sleep
return res
else:
res = func(*args, **kwargs) # 真正的time_sleep
return res
elif origin == 'mongodb':
print('非法登录')
else:
print('dsb')
return wrapper
return login_deco
# f = origin('file') # login_deco
# shopping = f(shopping)
# shopping()
@auth('file')
def shopping():
print('from shopping')
@auth('mongodb')
def withdraw():
print('from withdraw')
![image]()
- 装饰器是为了给函数增加功能,但是不改变函数内部语法,不改变函数调用方式