我想dict在 python 中制作 a 的深层副本。不幸的是,该.deepcopy()方法不存在于dict. 我怎么做?
dict
.deepcopy()
>>> my_dict = {'a': [1, 2, 3], 'b': [4, 5, 6]} >>> my_copy = my_dict.deepcopy() Traceback (most recent calll last): File "<stdin>", line 1, in <module> AttributeError: 'dict' object has no attribute 'deepcopy' >>> my_copy = my_dict.copy() >>> my_dict['a'][2] = 7 >>> my_copy['a'][2] 7
最后一行应该是3.
3
我希望修改my_dict不会影响快照my_copy。
my_dict
my_copy
我怎么做?该解决方案应与 Python 3.x 兼容。
怎么样:
import copy d = { ... } d2 = copy.deepcopy(d)
Python 2 或 3:
Python 3.2 (r32:88445, Feb 20 2011, 21:30:00) [MSC v.1500 64 bit (AMD64)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> import copy >>> my_dict = {'a': [1, 2, 3], 'b': [4, 5, 6]} >>> my_copy = copy.deepcopy(my_dict) >>> my_dict['a'][2] = 7 >>> my_copy['a'][2] 3 >>>