Python中浅拷贝的四种实现方法小结

# 浅拷贝 [:]
old_list = [1, 2, [3, 4]]
new_list = old_list[:]
old_list.append(5)
old_list[2][0] += 97
print("Old list:", old_list, "old list id:", id(old_list), " old list[0] id:", id(old_list[2]))
print("new list:", new_list, "new list id:", id(new_list), " new list[0] id:", id(new_list[2]))

# 输出结果
Old list: [1, 2, [100, 4], 5] old list id: 4537660608  old list[0] id: 4537659840
new list: [1, 2, [100, 4]] new list id: 4537711424  new list[0] id: 4537659840

old_list = [1, 2, [3, 4]]
new_list = list(old_list)
old_list.append(5)
old_list[2][0] += 97
print("Old list:", old_list, "old list id:", id(old_list), " old list[0] id:", id(old_list[2]))
print("new list:", new_list, "new list id:", id(new_list), " new list[0] id:", id(new_list[2]))

old_set = {1, 2, 3}
new_set = set(old_set)
old_set.add(4)
print("Old set:", old_set, "old set id:", id(old_set))
print("new set:", new_set, "new set id:", id(new_set))

# 输出结果
Old set: {1, 2, 3, 4} old set id: 4484723648
new set: {1, 2, 3} new set id: 4484723872

old_dict = {"name": "小明"}
new_dict = dict(old_dict)
old_dict["second"] = "Python"
print("Old dict:", old_dict, "old dict id:", id(old_dict))
print("new dict:", new_dict, "new dict id:", id(new_dict))

# 输出结果
Old dict: {'name': '小明', 'second': 'Python'} old dict id: 4514161536
new dict: {'name': '小明'} new dict id: 4515690304

old_list = [1, 2, [3, 4]]
new_list = old_list.copy()
old_list.append(5)
old_list[2][0] += 97
print("Old list:", old_list, "old list id:", id(old_list), " old list[0] id:", id(old_list[2]))
print("new list:", new_list, "new list id:", id(new_list), " new list[0] id:", id(new_list[2]))

# 输出结果
Old list: [1, 2, [100, 4], 5] old list id: 4309832000  old list[0] id: 4310372992
new list: [1, 2, [100, 4]] new list id: 4309735296  new list[0] id: 4310372992

old_set = {1, 2, 3}
new_set = old_set.copy()
old_set.add(4)
print("Old set:", old_set, "old set id:", id(old_set))
print("new set:", new_set, "new set id:", id(new_set))

# 输出结果
Old set: {1, 2, 3, 4} old set id: 4309931392
new set: {1, 2, 3} new set id: 4309930944

old_dict = {"name": "小明"}
new_dict = old_dict.copy()
old_dict["second"] = "Python"
print("Old dict:", old_dict, "old dict id:", id(old_dict))
print("new dict:", new_dict, "new dict id:", id(new_dict))
 
# 输出结果
Old dict: {'name': '小明', 'second': 'Python'} old dict id: 4308452288
new dict: {'name': '小明'} new dict id: 4308452224

 def copy(self, *args, **kwargs): # real signature unknown
  """ Return a shallow copy of the list. """
  pass

from copy import copy
old_list = [1, 2, [3, 4]]
new_list = copy(old_list)
old_list.append(5)
old_list[2][0] += 97
print("Old list:", old_list, "old list id:", id(old_list), " old list[0] id:", id(old_list[2]))
print("new list:", new_list, "new list id:", id(new_list), " new list[0] id:", id(new_list[2]))

# 输出结果
Old list: [1, 2, [100, 4], 5] old list id: 4381013184  old list[0] id: 4381159936
new list: [1, 2, [100, 4]] new list id: 4381012800  new list[0] id: 4381159936

from copy import copy
old_set = {1, 2, 3}
new_set = copy(old_set)
old_set.add(4)
print("Old set:", old_set, "old set id:", id(old_set))
print("new set:", new_set, "new set id:", id(new_set))

# 输出结果
Old set: {1, 2, 3, 4} old set id: 4381115552
new set: {1, 2, 3} new set id: 4381115776

from copy import copy
old_dict = {"name": "小明"}
new_dict = copy(old_dict)
old_dict["second"] = "Python"
print("Old dict:", old_dict, "old dict id:", id(old_dict))
print("new dict:", new_dict, "new dict id:", id(new_dict))

# 输出结果
Old dict: {'name': '小明', 'second': 'Python'} old dict id: 4381159680
new dict: {'name': '小明'} new dict id: 4379632576