1.在python中，對(duì)象賦值實(shí)際上是對(duì)象的引用。當(dāng)創(chuàng)建一個(gè)對(duì)象，然后把它賦給另一個(gè)變量的時(shí)候，python并沒有拷貝這個(gè)對(duì)象，而只是拷貝了這個(gè)對(duì)象的引用

（1）直接賦值,默認(rèn)淺拷貝傳遞對(duì)象的引用而已,原始列表改變，被賦值的b也會(huì)做相同的改變

# -*- coding: utf-8 -*-if __name__ == '__main__':b = [1, 2, 3]a = bprint(a)print(b)a.append(4)print(a)print(b)

（2）copy淺拷貝，沒有拷貝子對(duì)象，所以原始數(shù)據(jù)改變，子對(duì)象會(huì)改變

# -*- coding: utf-8 -*- import copyif __name__ == '__main__':b = [1, 2, ["hello", "word"]]a = copy.copy(b)print(a)print(b)a.append(4)print(a)print(b)b[2].append("鴻蒙2.0")print(a)print(b)

運(yùn)行結(jié)果：

"C:\Program Files\Python38\python.exe" E:/PythonSourceCode/test/main.py [1, 2, ['hello', 'word']] [1, 2, ['hello', 'word']] [1, 2, ['hello', 'word'], 4] [1, 2, ['hello', 'word']] [1, 2, ['hello', 'word', '鴻蒙2.0'], 4] 這里數(shù)據(jù)變了 [1, 2, ['hello', 'word', '鴻蒙2.0']]

（3）深拷貝，包含對(duì)象里面的自對(duì)象的拷貝，所以原始對(duì)象的改變不會(huì)造成深拷貝里任何子元素的改變

# -*- coding: utf-8 -*- import copyif __name__ == '__main__':b = [1, 2, ["hello", "word"]]a = copy.deepcopy(b)print(a)print(b)b[2].append("鴻蒙2.0")print(a)print(b)

運(yùn)行結(jié)果：

"C:\Program Files\Python38\python.exe" E:/PythonSourceCode/test/main.py [1, 2, ['hello', 'word']] [1, 2, ['hello', 'word']] [1, 2, ['hello', 'word']] [1, 2, ['hello', 'word', '鴻蒙2.0']] 創(chuàng)作挑戰(zhàn)賽新人創(chuàng)作獎(jiǎng)勵(lì)來咯，堅(jiān)持創(chuàng)作打卡瓜分現(xiàn)金大獎(jiǎng)

總結(jié)

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