Python3-2020-测试开发-13- 深浅拷贝

"""
浅拷贝和深拷贝

浅拷贝：不拷贝子对象的内容，只拷贝子对象的引用
深拷贝：会将子对象的内存也拷贝，对子对象的修改不会影响源对象
"""

import copy


def test_copy():

    a = [10,20,[60,70]]

    b = copy.copy(a)

    print("a-----:",a)     # a-----: [10, 20, [60, 70]]
    print("b-----:",b)     # b-----: [10, 20, [60, 70]]

    b.append(30)
    b[2].append(80)

    print("浅拷贝...")
    print("a-----:", a)    # a-----: [10, 20, [60, 70, 80]]
    print("b-----:", b)    # b-----: [10, 20, [60, 70, 80], 30]

def test_deep_copy():

    a = [10,20,[60,70]]

    b = copy.deepcopy(a)

    print("a-----:",a)     # a-----: [10, 20, [60, 70]]
    print("b-----:",b)     # b-----: [10, 20, [60, 70]]

    b.append(30)
    b[2].append(80)

    print("深拷贝...")
    print("a-----:", a)    # a-----: [10, 20, [60, 70]]
    print("b-----:", b)    # b-----: [10, 20, [60, 70, 80], 30]