浅copy 与 深copy

 import copy
 names = ["zhangyang", 'guyun', 'xiangpeng', ['jack','tom'], 'xuliangchen']
 names2 = names.copy() #浅copy,复制后改变原列表，copy后的列表不发生改变

 names[2] = "祥鹏"
 names.append("zhangshan")

 print(names)
 print(names2)

 names3 = copy.deepcopy(names)#深copy，copy后原列表改变，copy的列表也会发生同样改变
 print('this is names3:', names3)

浅copy的三种实现方式：

 import copy

 names = ["zhangyang", 'guyun', 'xiangpeng', ['jack','tom'], 'xuliangchen']

 #第一种方式
 names2 = copy.copy(names)
 #第二种
 names3 = names[:]
 #第三种
 names4 = list(names)