1. '='的赋值方式会带有关联性 >>> import numpy as np >>> a = np.arange(4) >>> b = a >>> c = a >>> d = b >>> a[0] = 11 >>> print(a) [11 1 2 3] #改变a的第一个值,b.c.d的第一个值也会同时改变 >>> b is a True >>&g…
# = 的赋值方式会带有关联性 import numpy as np a = np.arange(4) # array([0, 1, 2, 3]) b = a c = a d = b # 改变a的第一个值,b.c.d的第一个值也会同时改变. a[0] = 11 print(a) # array([11, 1, 2, 3]) # 确认b.c.d是否与a相同. b is a # True c is a # True d is a # True # 同样更改d的值,a.b.c也会改变. d[1:3]…
1.深复制与浅复制的概念 ->浅复制(shallow copy)概念 在SDK Guides中(搜索copy),官方给出的浅复制概念为: Copying compound objects, objects such as collection objects that can contain other objects, must also be done with care. As you would expect, using the = operator to perform a co…
Shallow copy and Deep copy 第一部分: 一.来自wikipidia的解释: Shallow copy One method of copying an object is the shallow copy. In that case a new object B is created, and the fields values of A are copied over to B. This is also known as a field-by-field copy,…
本文属原创,转载请注明出处:http://www.cnblogs.com/robinjava77/p/5481874.html (Robin) Student package base; import java.io.Serializable; /** * Created by robin on 2016/5/11. * * @author robin */ public class Student implements Cloneable,Serializable{ private Str…
Python中对于对象的赋值都是引用,而不是拷贝对象(Assignment statements in Python do not copy objects, they create bindings between a target and an object.).对于可变对象来说,当一个改变的时候,另外一个不用改变,因为是同时的,也就是说是保持同步的. 此时不想让他们同步的话可以使用copy模块,copy.copy()浅拷贝,copy.deepcopy()深拷贝. 前者是对整个对象的拷贝,对…
参考: [进阶4-1期]详细解析赋值.浅拷贝和深拷贝的区别 How to differentiate between deep and shallow copies in JavaScript 在编程语言中,数据或者值是存放在变量中的.拷贝的意思就是使用相同的值创建新的变量. 当我们改变拷贝的东西时,我们不希望原来的东西也发生改变. 深拷贝的意思是这个新变量里的值都是从原来的变量中复制而来,并且和原来的变量没有关联. 浅拷贝的意思是,新变量中存在一些仍然与原来的变量有关联的值. JavaScri…
Object copy An object copy is an action in computing where a data object has its attributes copied to another object of the same data type. An object is a composite data type in object-oriented programming languages. The copying of data is one of the…
