How to keep a unique data for all the classes/instances using it?

This question already has an answer here: Are static class variables possible? 16 answers Great thanks for BartoszKP pointed out that data set defined in Python class behaves like static in other language. I used the code below to verify this: class TwoDimList: _Val = [ [ i for i in range(6) ] for j in range(6)] def __init__(self) : for d1 in range(6): for d2 i

如何为使用它的所有类/实例保留唯一的数据?

这个问题在这里已经有了答案: 静态类变量可能吗? 16个答案 非常感谢BartoszKP指出,在Python类中定义的数据集在其他语言中表现得像静态一样。 我使用下面的代码来验证这一点: class TwoDimList: _Val = [ [ i for i in range(6) ] for j in range(6)] def __init__(self) : for d1 in range(6): for d2 in range(6): self._Val[d1][d2] = random.randint(0, 9) def

all values in python list are the same

This question already has an answer here: List of lists changes reflected across sublists unexpectedly 13 answers Are static class variables possible? 16 answers

python列表中的所有值都是相同的

这个问题在这里已经有了答案: 列表中列出的变化意外地反映在子列表中13个答案 静态类变量可能吗? 16个答案

Class variable have different values for different instances

This question already has an answer here: Are static class variables possible? 16 answers As soon as you assign to a name on an instance, it gains an instance attribute that shadows the class attribute. The only way you can assign to the class attribute is to assign to an attribute of the class, not an attribute of the instance, eg if you have an instance, you need to do: x1.__class__.pi

类变量对于不同的实例具有不同的值

这个问题在这里已经有了答案: 静态类变量可能吗? 16个答案 只要您为实例指定名称,它就会获得一个影响类属性的实例属性。 您可以分配给类属性的唯一方法是分配给类的属性,而不是实例的属性,例如,如果您有实例,则需要执行以下操作: x1.__class__.pi = 20 # If you're on Py3, or on Py2 and x1 is an instance of a new-style class, # using type(x1) is slightly "nicer" than manually accessing dunder special

Are Class variables mutable?

This question already has an answer here: Are static class variables possible? 16 answers Python: Difference between class and instance attributes 6 answers var is a static class variable of someClass . When you reach out to get x.var , y.var or some_other_instance.var , you are accessing the same variable, not an instance derived one (as long as you didn't specifically assigned it t

类变量是否可变?

这个问题在这里已经有了答案: 静态类变量可能吗? 16个答案 Python:类和实例属性之间的区别6个答案 var是someClass的静态类变量。 当你伸出手去取得x.var , y.var或some_other_instance.var ,你正在访问同一个变量,而不是一个派生的实例(只要你没有专门将它作为属性分配给实例)。

Behavior of class variables

This question already has an answer here: Python class variables or class variables in general 4 answers Differences between static and instance variables in python. Do they even exist? 6 answers Compound assignment to Python class and instance variables 5 answers Are static class variables possible? 16 answers Because qb -= 1 creates an instance variable with the name b , look in yo

类变量的行为

这个问题在这里已经有了答案: Python类变量或类变量一般4个答案 python中静态和实例变量的区别。 他们是否存在? 6个答案 对Python类和实例变量的复合赋值5个答案 静态类变量可能吗? 16个答案 由于qb -= 1用名称b创建一个实例变量,请查看您的__dict__ : q.__dict__ {'b': 4, 'x': 5, 'y': 6} p.__dict__ {'x': 5, 'y': 6} qb与ab不同,在赋值之后你已经隐藏了ab 。 请注意,这不是Python 3的特定问题,Pyth

Python class variables scope not as per documentation

This question already has an answer here: Are static class variables possible? 16 answers Doing d.kind='cat' creates a new instance attribute named kind and sets it to 'cat' . Moreover, this overshadows the class attribute. In order to change the class attribute, you need to set it on the class itself and not an instance: Dog.kind='cat' If you do instance.attr = "bl

Python类变量的范围不是按照文档

这个问题在这里已经有了答案: 静态类变量可能吗? 16个答案 做d.kind='cat'会创建一个名为kind的新实例属性并将其设置为'cat' 。 而且,这会掩盖类属性。 为了更改类属性,您需要将其设置在类本身而不是实例上: Dog.kind='cat' 如果你做了instance.attr = "blah" ,你总是设置一个实例属性,即使已经有一个同名的类属性。 通过这样做d.kind = "cat"创建归于一个实例称为kind其

Python Static Class attributes

This question already has an answer here: Are static class variables possible? 16 answers 为了让你的代码像你想要的那样工作,使用myClass.__a来访问变量,而不是self.__a 。 def increase_A(self): myClass.__a += 1 return def get_A(self): return myClass.__a They start off as the same variable. However, when you do self.__a += 1 this rebinds the object's __a to a new object whose

Python静态类属性

这个问题在这里已经有了答案: 静态类变量可能吗? 16个答案 为了让你的代码像你想要的那样工作,使用myClass.__a来访问变量,而不是self.__a 。 def increase_A(self): myClass.__a += 1 return def get_A(self): return myClass.__a 他们以相同的变量开始。 但是,当你这样做 self.__a += 1 这会将对象的__a重新__a到值为1的新对象。 它不会更改任何其他对象的__a因此代码将打印出0 。

Python object containing an array of objects being weird

Possible Duplicate: Static class variables in Python Python OOP and lists just wondering if I could get some help on this. I am using python, and have hit an obstacle that I can't seem to figure out with a small program I am working on. Here is my problem (using a very simple and unrelated example): I have a class: class dog: name = '' friends = [] I make a couple objects f

包含一组对象的Python对象很奇怪

可能重复: Python中的静态类变量 Python OOP和列表 只是想知道我能否在这方面得到一些帮助。 我正在使用python,并遇到了一个障碍,我似乎无法弄清楚我正在开发的一个小程序。 这是我的问题(使用一个非常简单和不相关的例子):我有一个类: class dog: name = '' friends = [] 我从中创建了一些对象: fido = dog() rex = dog() 这里是我卡住的地方。 我不知道为什么会发生这种情况,我还没有弄明白。

Static member of a function in Python ?

Possible Duplicate: Static class variables in Python What is the Python equivalent of static variables inside a function? How can I use static fields in Python ? for example i want to count how many times the function has been called - how can i do this ? If you wish to count how many times a method has been called, no matter which instance called it, you could use a class member like t

Python中的一个函数的静态成员?

可能重复: Python中的静态类变量 什么是函数内部的静态变量的Python等价物? 我如何在Python中使用静态字段? 例如我想要计算函数被调用了多少次 - 我怎么能这样做? 如果你想计算一个方法被调用的次数,不管哪个实例调用它,你都可以使用类成员: class Foo(object): calls=0 # <--- call is a class member def baz(self): Foo.calls+=1 foo=Foo() bar=Foo() for i in range(100):

Removing consecutive occurrences from end of list python

I have a numpy array: ar = np.array([True, False, True, True, True]) If the last element is True, I want to remove all of the consecutive true elements at the end of the array. So for example magic_func(ar) => [True, False] If ar = [True, False, True, False, True] . Then magic_func(ar) => [True, False, True, False] If ar = [True, False, False] , the function does nothing, because th

从列表末尾删除连续的事件

我有一个numpy数组: ar = np.array([True, False, True, True, True]) 如果最后一个元素为True,我想删除数组末尾的所有连续true元素。 举个例子 magic_func(ar) => [True, False] 如果ar = [True, False, True, False, True] 。 然后 magic_func(ar) => [True, False, True, False] 如果ar = [True, False, False] ,则该函数不执行任何操作,因为最后一个元素为False Python中是否有一行代码需要执行此操作?