decorated_function = new_decorator(decorated_function) #输出: #I am a decorator! I am executed only when you decorate a function. #As the decorator, I return the wrapped function # 让我们调用这个函数 decorated_function() #
To pass arguments to the function within a decorator: def my_decorator(func): def wrapper(*args, **kwargs): print("Before call") result = func(*args, **kwargs) print("After call") return result return wrapper @my_decorator def greet(name): print(f"Hello {name}") greet("Alice")...
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...
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 ...
Python hello_decorator.py def decorator(func): def wrapper(): print("Something is happening before the function is called.") func() print("Something is happening after the function is called.") return wrapper def say_whee(): print("Whee!") say_whee = decorator(say_whee) ...
()#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 debug_decorator(func): @functools.wraps(func) def wrapper(*args, **kwargs): print(f"Calling function {func.__name__} with arguments: {args}, {kwargs}") result = func(*args, **kwargs) print(f"Function {func.__name__} returned: {result}") ...
A function decorator is applied to a function definition by placing it on the line before that function definition begins. For example: @myDecorator def aFunction(): print "inside aFunction" When the compiler passes over this code,aFunction()is compiled and the resulting function object is pa...
高阶函数英文叫Higher-order function 8.1实参和形参 形参:函数完成其工作所需要的一项信息。 实参:调用函数时专递给给函数的信息。 8.2传递参数 函数定义中可能包含多个形参,因此函数调用时也可能包含多个实参。向函数传递实参的方式很多,可使用位置实参,这要求实参的顺序与形参的顺序相同;也可使用关键字实参,其中每个...
@decorator deffunc():pass 其解释器会解释成下面这样的语句: func = decorator(func) 其实就是把一个函数当参数传到另一个函数中,然后再回调,但是值得注意的是装饰器必须返回一个函数给func 装饰器的一大特性是,能把被装饰的函数替换成其他函数。第二大特性是,装饰器在加载模块时立即执行。