python deepcopy
>>> import copy >>> nums = [1, 2, 3] >>> data = {'a': 10, 'b': nums} >>> data {'a': 10, 'b': [1, 2, 3]} >>> data_copy = copy.copy(data) >>> data_deep = copy.deepcopy(data) >>> data_copy {'a': 10, 'b': [1, 2, 3]} >>> data_deep {'a': 10, 'b': [1, 2, 3]} >>> data_copy['a'] += 2 >>> nums[1:1] = [254] >>> data {'a': 10, 'b': [1, 254, 2, 3]} >>> data_copy {'a': 12, 'b': [1, 254, 2, 3]} >>> data_deep {'a': 10, 'b': [1, 2, 3]}
