第一种使用def关键字创建自定义函数（最常见的），第二种使用lambda关键字创建匿名函数。
# Create and return a wrapper function. if _func is None: return decorator_name # 2 else: return decorator_name(_func) # 3 def repeat(_func=None, *, num_times=2): def decorator_repeat(func): @functools.wraps(func) def wrapper_repeat(*args, **kwargs): for _ in range(num_times...
Create a file called decorators.py with the following content:Python decorators.py def do_twice(func): def wrapper_do_twice(): func() func() return wrapper_do_twice The do_twice() decorator calls the decorated function twice. You’ll soon see the effect of this in several examples....
print("Decorator 2 after") return wrapper @decorator1 @decorator2 def my_function(): print("Original Function") my_function() 运行这段代码时,输出将是: Decorator 2 before Decorator 1 before Original Function Decorator 1 after Decorator 2 after4.1.2 使用functools.wraps保持元信息完整性 当装饰器...
When you create a decorator, the wrapper function (inside the decorator) is a closure. 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 ...
@timeit_wrapperdefexp(x): ...print('{0:<10}{1:<8}{2:^8}'.format('module', 'function', 'time'))exp(Decimal(150))exp(Decimal(400))exp(Decimal(3000))在GitHub上查看rawtimeit_decorator_usage.py全部代码 输出如下：~ $ python3.8 slow_program.pymodule function time __main...
()#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...
new_decorator = decorator_maker() # 输出为: #I make decorators! I am executed only once: when you make me create a decorator. #As a decorator maker, I return a decorator # 然后我们装饰一个函数 def decorated_function(): print "I am the decorated function." ...
"""def__init__(self, function):# for @classmethod decoratorpass# ...classstaticmethod(object):""" staticmethod(function) -> method """def__init__(self, function):# for @staticmethod decoratorpass# ... 装饰器的@语法就等同调用了这两个类的构造函数。
Similarly, you can use inner functions to create decorators. Remember, a decorator is a function that returns a function:Python 1def triple(func): 2 def wrapper_triple(*args, **kwargs): 3 print(f"Tripled {func.__name__!r}") 4 value = func(*args, **kwargs) 5 return value * ...