decorator_with_arguments.py class decorator_with_arguments(object): def __init__(self, arg1, arg2, arg3): # TypeError: __init__() takes 4 positional arguments but 5 were given """ If there are decorator arguments, the function to be decorated is not passed to the constructor! """ ...
def decorator_with_arguments(function): def wrapper_accepting_arguments(arg1, arg2): print("My arguments are: {0}, {1}".format(arg1,arg2)) function(arg1, arg2) return wrapper_accepting_arguments @decorator_with_arguments def cities(city_one, city_two): print("Cities I love are {0} an...
(一)Decorator应用之一:Trace 函数 这个是最普通的一个应用,使用Trace函数或一个Trace类可以知道一个函数的状态和参数,这个功能可以很方便的帮助你调试代码,了解当前的运 行情况,这里将用到下面几个知识点Function as Decorator、Object as Decorator、Decorator with arguments(参数) 1.Function Decorator def traced(f...
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...
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 inside another function. In this case, you usually end up with three return statements. You can ...
class decorator_with_arguments(object): def __init__(self, arg1, arg2, arg3): # TypeError: __init__() takes 4 positional arguments but 5 were given """ If there are decorator arguments, the function to be decorated is not passed to the constructor!
print(f"Calling function {func.__name__} with arguments: {args}, {kwargs}") result = func(*args, **kwargs) print(f"Function {func.__name__} returned: {result}") return result return wrapper @debug_decorator def add(a, b): ...
format(original_function.__name__)) # 添加功能的地方 return original_funciton(*args, **kwargs) return inner_function # 创造decorator @outer_function def display(): print("display function ran") @outer_function def display_info(name, age): print("display_info func ran with arguments: {},...
想理解Python的decorator首先要知道在Python中函数也是一个对象,所以你可以 将函数复制给变量 将函数当做参数 返回一个函数 函数在Python中给变量的用法一样也是一等公民,也就是高阶函数(High Order Function)。所有的魔法都是由此而来。 1,起源 我们想在函数login中输出调试信息,我们可以这样做 1 2 3 4 5 6 7...
In the next example, we create a simple decorator example. main.py #!/usr/bin/python def enclose(fun): def wrapper(): print("***") fun() print("***") return wrapper def myfun(): print("myfun") enc = enclose(myfun) enc() The enclose function is a decoratorwhich extends ...