浅拷贝和深拷贝

Python中内置函数：copy(浅拷贝)、deepcopy(深拷贝)
浅拷贝：不拷贝子对象的内容，只拷贝子对象的引用
深拷贝：会连子对象的内存也拷贝一份，对子对象的修改不会影响源对象

import copy

def testCopy():
    a = [10, 20, [5, 6]]
    b = copy.copy(a)
    print("a:", a)
    print("b", b)

    b.append(30)
    b[2].append(7)
    print("浅拷贝----")
    print("a:", a)
    print("b:", b)

def testDeepCopy():
    a = [10, 20, [5, 6]]
    b = copy.deepcopy(a)
    print("a:", a)
    print("b", b)

    b.append(30)
    b[2].append(7)
    print("深拷贝----")
    print("a:", a)
    print("b:", b)
testCopy()
print("*************")
testDeepCopy()