python3-- =、浅拷贝、深拷贝
2021-05-12 17:30
标签：append 赋值 完全 class port import print bsp span 1、赋值 = 结论：alist随着blist变化了 2、浅拷贝copy.copy() 结论：copy.copy()中， 父级列表完全独立拷贝，全新地址保存，子级列表是共用的，拷贝不彻底 3、深拷贝 copy.deepcopy() 结论：copy.deepcopy()是彻底的拷贝 python3-- =、浅拷贝、深拷贝 标签：append 赋值 完全 class port import print bsp span 原文地址：https://www.cnblogs.com/guang2508/p/13138253.html# alist = [10,20,[100,200]]
# blist = alist
# blist.append(30)
# print(‘alist: ‘,alist,‘ ; id是: ‘,id(alist))
# print(‘blist: ‘,blist,‘ ; id是: ‘,id(blist))
结果：
alist: [10, 20, [100, 200], 30] ; id是: 1722968
blist: [10, 20, [100, 200], 30] ; id是: 1722968
import copy
alist = [10,20,[100,200]]
blist = copy.copy(alist)#复制
blist.append(30)
print(‘alist: ‘,alist,‘ ; id是: ‘,id(alist))
print(‘blist: ‘,blist,‘ ; id是: ‘,id(blist))
结果：
alist: [10, 20, [100, 200]] ; id是: 9734784
blist: [10, 20, [100, 200], 30] ; id是: 9734944
import copy
alist = [10,20,[100,200]]
blist = copy.copy(alist)#复制
blist[-1].append(300)
print(‘alist: ‘,alist,‘ ; id是: ‘,id(alist))
print(‘blist: ‘,blist,‘ ; id是: ‘,id(blist))
结果：
alist: [10, 20, [100, 200, 300]] ; id是: 7834320
blist: [10, 20, [100, 200, 300]] ; id是: 7833640
import copy
alist = [10,20,[100,200]]
blist = copy.deepcopy(alist)
blist.append(30)
blist.append(30)
print(‘alist: ‘,alist,‘ ; id是: ‘,id(alist))
print(‘blist: ‘,blist,‘ ; id是: ‘,id(blist))
结果：
alist: [10, 20, [100, 200]] ; id是: 16681640
blist: [10, 20, [100, 200], 30, 30] ; id是: 16681000
import copy
alist = [10,20,[100,200]]
blist = copy.deepcopy(alist)
# blist.append(30)
blist[-1].append(300)
blist.append(30)
print(‘alist: ‘,alist,‘ ; id是: ‘,id(alist))
print(‘blist: ‘,blist,‘ ; id是: ‘,id(blist))
结果：
alist: [10, 20, [100, 200]] ; id是: 13929208
blist: [10, 20, [100, 200, 300], 30] ; id是: 13928568
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文章标题：python3-- =、浅拷贝、深拷贝
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