def __call__(self, *args, **kwargs): start_time = time.time() result = self.func(*args, **kwargs) end_time = time.time() print(f"{self.func.__name__} executed in {end_time - start_time:.4f}s") return result @TimerDecorator def example_function(): time.sleep(1) print(...
我们把 Person 类变成一个可调用对象:classPerson(object):def__init__(self, name, gender): self.name =name self.gender =genderdef__call__(self, friend):print'My name is %s...' %self.nameprint'My friend is %s...' %friend 现在可以对 Person实例直接调用: >>> p = Person('Bob','mal...
# class A(object): python2 必须显示地继承object class A: def __init__(self): print("__init__ ") super(A, self).__init__() def __new__(cls): print("__new__ ") return super(A, cls).__new__(cls) def __call__(self): # 可以定义任意参数 print('__call__ ') A() ...
>>>classSampleClass:...defmethod(self):...print("You called method()!")...>>>type(SampleClass)<class'type'>>>dir(type)['__abstractmethods__','__annotations__','__base__','__bases__','__basicsize__','__call__',...]>>>sample_instance=SampleClass()>>>dir(sample_instance...
def __call__(self): print("hello "+) a = People('刘亦菲') a.__call__() # 调用方法一 a() # 调用方法二 1. 2. 3. 4. 5. 6. 7. 8. 程序执行结果为: hello 刘亦菲 hello 刘亦菲 1. 2. __call__()和object()这两种使用方式效果一样的现象,即调用方法一和调用方法二效果一样。
# class A(object): python2 必须显示地继承object,下面是python3的版本 class A: def __init__(self): print("__init__ ") super(A, self).__init__() def __new__(cls): print("__new__ ") return super(A, cls).__new__(cls) ## 返回实例化对象(new一个) def __call__(self)...
1#class A(object): python2 必须显示地继承object2classA:3def__init__(self):4print("__init__")5super(A, self).__init__()67def__new__(cls):8print("__new__")9returnsuper(A, cls).__new__(cls)1011def__call__(self):#可以定义任意参数12print('__call__')1314A() ...
defA():# A 是外围函数msg="I like python in A"defB():# B 是嵌套函数print(msg)returnB b=A()# 输出 I like python in Ab() 正常理解下,函数中的局部变量仅在函数的执行期间可用,所以 A() 执行过后,我们会认为 A函数里面的 msg 变量将不再可被外界读取。然而,在这里我们发现 A() 执行完之后...
这样不仅可以实现代码的复用，还可以使代码更有条理性，增加代码的可靠性。下面我们来介绍一下python的...
通过下面的示例代码来说明 Python 中 Traceback 所提供的信息 def who_to_greet(person ): return person if person else input ('Greet who? ')def greet(someone, greeting='Hello'): print(greeting + ', ' + who_to_greet (someone ))def greet_many(people): for person in people: try: greet(...