class MyClass:def __init__(self, value):self.value = valuedef __copy__(self):new_object = MyClass(self.value)return new_objectoriginal_object = MyClass(10)copied_object = copy.copy(original_object)d_copied_object = copy.deepcopy(original_object)print(original_object.value, copied_object...
class instances). - A shallow copy constructs a new compound object and then (to the extent possible) inserts *the same objects* into it that the original contains. - A deep copy constructs a new compound object and then, recursively, inserts *copies* into it of the objects found in the...
浅拷贝(copy):拷贝父对象,不会拷贝对象的内部的子对象。即浅复制只复制对象本身,没有复制该对象所引用的对象。Ashallow copyconstructs a new compound object and then (to the extentpossible) insertsreferencesinto it to the objects found in the original. 深拷贝(deepcopy): copy 模块的 deepcopy 方法,完...
1. copy.copy 浅拷贝 仅仅拷贝父对象,不会拷贝对象的内部的子对象。 2. copy.deepcopy 深拷贝 拷贝对象及其子对象 见下例: import copy a = [1, 2, 3, 4, ['a', 'b']] #原始对象 e = a[:] #利用分片操作进行拷贝(浅拷贝) b = a #赋值。传对象的引用 c = copy.copy(a) #对象拷贝,浅...
1. copy.copy 浅拷贝 仅仅拷贝父对象,不会拷贝对象的内部的子对象。 2. copy.deepcopy 深拷贝 拷贝对象及其子对象 见下例: import copy a = [1, 2, 3, 4, ['a', 'b']] #原始对象 e = a[:] #利用分片操作进行拷贝(浅拷贝) b = a #赋值。传对象的引用 ...
.name,memo),[])print(' Copying to new object {}'.format(dup))memo[self]=dupforcinself.connections:dup.add_connection(copy.deepcopy(c,memo))returnduproot=Graph('root',[])a=Graph('a',[root])b=Graph('b',[a,root])root.add_connection(a)root.add_connection(b)dup=copy.deepcopy(...
class Dict(dict): pass obj = Dict(red=1, green=2, blue=3) # this object is weak referenceable CPython 实现细节: 其他内置类型,如 tuple 和int,不支持弱引用,即使通过子类化也不支持。8.7 Python对不可变类型施加的把戏 对元组 t 来说, t[:] 不创建副本,而是返回同一个对象的引用。此外,tuple(t...
class Singleton(object): def __new__(cls, *args, **kw): if not hasattr(cls, '_instance'): orig = super(Singleton, cls) cls._instance = orig.__new__(cls, *args, **kw) return cls._instance class MyClass(Singleton): a = 1 2 共享属性 创建实例时把所有实例的__dict__指向同...
importcopy # copy 和 deepcopy 的区别 l1 = [1, 2, 3, ['a', 'b']] # copy 浅复制,不会拷贝其子对象,修改子对象,将受影响 l2 = copy.copy(l1) # deepcopy 深复制,将拷贝其子对象,修改子对象,将不受影响 l3 = copy.deepcopy(l1) ...
This brings us to inheritance, which is a fundamental aspect of object-oriented programming. 这就引出了继承,这是面向对象编程的一个基本方面。 Inheritance means that you can define a new object type, a new class, that inherits properties from an existing object type. 继承意味着您可以定义一个新...