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我在 python 3.2.2 IDLE 中运行了这些代码：

from copy import deepcopy
deepcopy(globals())

我收到错误消息：

Traceback (most recent call last):
  File "H:\　  　 　\python\copy deepcopy.py", line 27, in <module>
    deepcopy(globals())
  File "D:\Program Files\Python32\lib\copy.py", line 147, in deepcopy
    y = copier(x, memo)
  File "D:\Program Files\Python32\lib\copy.py", line 236, in _deepcopy_dict
    y[deepcopy(key, memo)] = deepcopy(value, memo)
  File "D:\Program Files\Python32\lib\copy.py", line 174, in deepcopy
    y = _reconstruct(x, rv, 1, memo)
  File "D:\Program Files\Python32\lib\copy.py", line 290, in _reconstruct
    state = deepcopy(state, memo)
  File "D:\Program Files\Python32\lib\copy.py", line 147, in deepcopy
    y = copier(x, memo)
  File "D:\Program Files\Python32\lib\copy.py", line 236, in _deepcopy_dict
    y[deepcopy(key, memo)] = deepcopy(value, memo)
  File "D:\Program Files\Python32\lib\copy.py", line 174, in deepcopy
    y = _reconstruct(x, rv, 1, memo)
  File "D:\Program Files\Python32\lib\copy.py", line 285, in _reconstruct
    y = callable(*args)
  File "D:\Program Files\Python32\lib\copyreg.py", line 88, in __newobj__
    return cls.__new__(cls, *args)
TypeError: object.__new__(NotImplementedType) is not safe, use NotImplementedType.__new__()

所以我不知道为什么我们不能对 globals() 做 deepcopy()？

因为 deepcopy() 在执行时会更改全局字典？

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1 回答 1

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不，这不是因为deepcopy在执行时更改了 globals dict，而是正如异常所示，在它的过程中，它遇到了特殊的NotImplemented 内置常量NotImplementedType，它无法实例化并因此复制的类型元素。

于 2013-02-07T13:06:43.920 回答