Python深浅copy

                1 l1 = [1, 2, 3]
2 l2 = l1
3 l1.append(‘a‘)
4print(l1, l2)       # 深cpoy56 l1 = [1, 2, 3]
7 l2 = l1.copy()      # 浅拷贝8 l2.append(‘a‘)
9print(l1, l2)

                 1
                #
                 赋值运算
                 2
                #
                 l1 = [1,2,3]
                 3
                #
                 l2 = l1
                 4
                #
                 l1.append(‘a‘)
                 5
                #
                 print(l1,l2)
                 6
                 7
                #
                copy
                 8
                #
                 l1 = [1,2,3]
                 9
                #
                 l2 = l1.copy()
                10
                #
                 print(l1,l2)
                11
                #
                 print(id(l1),id(l2))
                12
                #
                 l2.append(‘a‘)
                13
                #
                 print(l1,l2)
                14
                15
                #
                 l1 = [1,2,[4,5,6],3]
                16
                #
                 l2 = l1.copy()
                17
                18
                #
                 print(l1,id(l1))
                19
                #
                 print(l2,id(l2))
                20
                #
                 l1.append(‘a‘)
                21
                #
                 print(l1,l2)
                22
                #
                 l1[2].append(‘a‘)
                23
                #
                 print(l1,l2)
                24
                #
                 print(id(l1[2]))
                25
                #
                 print(id(l2[2]))
                26
                import
                 copy

                27
                #
                 l1 = [1,2,[4,5,6],3]
                28
                #
                 l2 = copy.deepcopy(l1)
                29
                #
                 print(l1,id(l1))
                30
                #
                 print(l2,id(l2))
                31
                #
                 l1[2].append(‘a‘)
                32
                #
                 print(l1,l2)
                33
                34
                #
                 l1 = [1,[1],2,3,4]
                35
                #
                 l2 = l1[:]
                36
                #
                 l1[1].append(‘a‘)
                37
                #
                l2 的结果是什么?
                38
                39
                40
                #
                 print(l1,id(l1))
                41
                #
                 print(l2,id(l2))
                42
                #
                 print(l1[1] is l2[1])
                43
                44
                #
                 li = [‘alex‘,‘taibai‘,‘wusir‘,‘egon‘]
                45
                #
                 for i in li:
                46
                #
                     print(li.index(i),i)
                47
                48
                #
                 for index,i in enumerate(li,1):
                49
                #
                     print(index,i)