Python深浅copy
1 l1 = [1, 2, 3] 2 l2 = l1 3 l1.append('a') 4 print(l1, l2) # 深cpoy 5 6 l1 = [1, 2, 3] 7 l2 = l1.copy() # 浅拷贝 8 l2.append('a') 9 print(l1, l2)
1.其他代码
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)
