It retains access to the function being decorated and any additional state or arguments defined in the decorator function. For example: def simple_decorator(func): def wrapper(): print("Before the function call") func() print("After the function call") return wrapper @simple_decorator def ...
Here, when we call thedivide()function with the arguments(2,5), theinner()function defined in thesmart_divide()decorator is called instead. Thisinner()function calls the originaldivide()function with the arguments2and5and returns the result, which is0.4. Similarly, When we call thedivide()f...
new_decorator = decorator_maker() #输出: #I make decorators! I am executed only once: when you make me create adecorator. #As a decorator maker, I return a decorator # 让我们装饰这个函数 def decorated_function(): print("I am the decorated function.") decorated_function = new_decorator(...
You saw that, to define a decorator, you typically define a function returning a wrapper function. The wrapper function uses *args and **kwargs to pass on arguments to the decorated function. If you want your decorator to also take arguments, then you need to nest the wrapper function insi...
function_to_decorate(*args, **kwargs) return a_wrapper_accepting_arbitrary_arguments @a_decorator_passing_arbitrary_arguments def function_with_no_argument(): print "Python is cool, no argument here." function_with_no_argument() #输出为: ...
In the example, we use a class decorator to count the calls of a regular function. def __init__(self, fun): functools.update_wrapper(self, fun) self.fun = fun self.num_of_calls = 0 We call theupdate_wrapperfunction. It has the same purpose as the@wrapsdecorator; i.e. it keeps...
()#outputs: I am a stand alone function, don't you dare modify me# Well, you can decorate it to extend its behavior.# Just pass it to the decorator, it will wrap it dynamically in# any code you want and return you a new function ready to be used:# 为了给这个函数添加一些功能,你...
def __decorator(user): #add parameter receive the user information print('enter the login') func(user) #pass user to login print('exit the login') return __decorator @printdebug def login(user): print('in login:' + user) login('jatsz') #arguments:jatsz 我们来解释一下login(‘jat...
HI, I AM CREATED BY A FUNCTION PASSED AS AN ARGUMENT. hi, i am created by a function passed as an argument. 例3: 从函数中返回函数。 def shout(text): return text.upper() def whisper(text): return text.lower() def greet(func): ...
Context managers are straightforward to use, and adding with Timer() can help you more clearly distinguish your code visually. You used a decorator to add behavior to a function. Decorators are concise and compelling, and using @Timer() is a quick way to monitor your code’s runtime. You...