@classmethod, @staticmethod: 可以在不实例化的情况下直接调用类方法 @jit: 加速python代码运行(利用numba库) @Iru_cache: 使用缓存加速函数的连续运行 二、lazy property装饰器 了解了装饰器的作用之后,我们来看看如何实现lazy property装饰器。首先我们考虑@property装饰器,该装饰器可以将类的方法变成类的属性,但这...
def lazy_property(func): # 创建protected属性 attr_name = "_lazy_" + func.__name__ @property def _lazy_property(self): # print("done") if not hasattr(self, attr_name): # print("set") setattr(self, attr_name, func(self)) return getattr(self, attr_name) return _lazy_property cl...
这就是lazy property。 lazy property 实现延迟初始化有两种方式,一种是使用python描述符,另一种是使用@property修饰符。 结果'evalute'只输出了一次。在lazy类中,我们定义了__get__()方法,所以它是一个描述符。当我们第一次执行c.area时,python解释器会先从c.__dict__中进行查找,没有找到,就从Circle.__di...
这就是Python中的lazy property。本文介绍两种方法。一种是使用python描述符,另一种是使用python修饰符。 1、使用python描述符 class lazy(object): def __init__(self, func): self.func = func def __get__(self, instance, cls): val = self.func(instance) setattr(instance, self.func.__name__,...
npm install lazy-property API require("lazy-property")(obj, name, init[, enumerable]) Adds a lazily initialized property to the object. objis the object to add the property to nameis the name of the property initis a function that computes the value of the property ...
lazyProperty.js package.json README MIT license lazy-property Adds a lazily initialized property to an object. Example varaddLazyProperty=require("lazy-property")varobj={}addLazyProperty(obj,"foo",function(){console.log("initialized!")return"bar"})//Access the propertyconsole.log(obj.foo)conso...
上面一段装饰器的代码,相信大家都明白其原理,通过装饰器a指向了outter的返回值,也就是其内部函数inner,然后调用a,其实调用的是被装饰后的函数。那么接下来,引入我们今天的话题lazy property. classlazy(object):def__init__(self, func):self.func = funcdef__get__(self, instance, cls): ...
@lazyproperty defis_org_admin(self): ifself.is_superuserorself.related_admin_orgs.exists(): returnTrue 16apps/users/templates/users/user_profile.html @@ -173,22 +173,22 @@ {% if request.user.can_update_password%} {% trans 'Updatepassword...
IsLazy Property Reference Feedback Definition Namespace: Microsoft.VisualStudio.Composition Assembly: Microsoft.VisualStudio.Composition.dll Package: microsoft.visualstudio.composition vD:\a\1\s\dotnet\nue-out\_pacman038e4\Microsoft.VisualStudio.Composition.16.4.11 Source: ImportDefinitionBinding.c...
Lazy initialization is often used when the initial value is relatively expensive to create. You only create the value when you are sure you need it. If you are coming to Swift from Objective-C you may be familiar with the technique of using a getter to lazily initialize a property only wh...