Cython和deepcopy（）在引用的方法/功能方面陷入困境。还有其他想法吗？ [英] Cython and deepcopy() woes with referenced methods/functions. Any alternative ideas?

问题描述

我最近一直在与Cython一起玩，以提高速度，但是我的项目继承了一个模块，该模块具有 copy（）方法，该方法使用 deepcopy（）。我试着在 copy（）的重写版本中实现 deepcopy（），我以为可以正常工作了，

I've been playing with Cython recently for the speed ups, but my project inherits a module that has a copy() method which uses deepcopy(). I tried implementing the deepcopy() within an overrided version of copy(), and I thought I had it working, but it doesn't appear to be anymore.

TypeError: object.__new__(cython_binding_builtin_function_or_method) is not safe,
   use cython_binding_builtin_function_or_method.__new__()

这是在python / lib / copy_reg.py中发生的：

This is occuring in python/lib/copy_reg.py here:

return cls.__new__(cls, *args)

我在这里使用Python 2.7。较新版本的Python是否有可能以安全的方式从 deepcopy（）返回？我也在使用最新版本的Cython，版本为0.15.1。

I'm on Python 2.7 here. Is it possible that a newer version of Python returns from deepcopy() in a "safe" way? I'm also on the latest version of Cython, 0.15.1.

注意我已经删除了以前的更新，以使其尽可能简单。

好！我想我发现了这种不兼容，但我真的不知道该怎么办。

Ok! I think I found the incompatibility but I don't really know what to do about it.

class CythonClass:
    def __init__(self):
        self._handle = self._handles.get("handle_method")

    def call_handle(self):
        self._handle(self)

    def handle_method(self):
        print "I'm a little handle!"

    handles = {"handle_method", handle_method}

然后在我的主目录中应用程序：

Then in my main app:

from cython1 import CythonClass
from copy import deepcopy

if __name__ == "__main__":
    gc1 = CythonClass()
    gc1.call_handle()
    gc2 = deepcopy(gc1)

我得到：

I'm a little handle!

Traceback (most recent call last):
  File "cythontest.py", line 8, in <module>
    gc2 = deepcopy(gc1)
  File "C:\python26\lib\copy.py", line 162, in deepcopy
    y = copier(x, memo)
  File "C:\python26\lib\copy.py", line 292, in _deepcopy_inst
    state = deepcopy(state, memo)
  File "C:\python26\lib\copy.py", line 162, in deepcopy
    y = copier(x, memo)
  File "C:\python26\lib\copy.py", line 255, in _deepcopy_dict
    y[deepcopy(key, memo)] = deepcopy(value, memo)
  File "C:\python26\lib\copy.py", line 189, in deepcopy
    y = _reconstruct(x, rv, 1, memo)
  File "C:\python26\lib\copy.py", line 323, in _reconstruct
    y = callable(*args)
  File "C:\python26\lib\copy_reg.py", line 93, in __newobj__
    return cls.__new__(cls, *args)
TypeError: object.__new__(cython_binding_builtin_function_or_method) is not safe, use cython_binding_builtin_function_or_method.__new__()

键是函数/句柄引用：

handles = {"handle_method", handle_method}

如果我不这样做，包括方法/功能参考，Cython在深度复制期间不会爆炸。如果我添加一个，那不喜欢deepcopy / copy_reg如何复制引用。

If I don't include the method/function reference, Cython will not blow up during deepcopy. If I include one, it doesn't like how deepcopy/copy_reg copies the reference over.

除了不使用方法/函数引用之外，还有其他想法吗？如果有一个简单的答案，我有一些麻烦。 （当我完成此输入时，我已经在使用它了）

Any ideas besides not using method/function references? I have a bit of untangling to do if that the simple answer. (which I'm already working on as I finish typing this)

谢谢！

推荐答案

啊，终于找到了回答您自己的问题按钮。

Ah, finally found the "Answer your own question" button.

我可能不耐烦，但是由于没有人回复（我的意思是（谁正在使用Cython并在星期四的下午回答问题），我想我应该关闭它。

I'm probably being impatient, but since nobody has replied yet (I mean who's using Cython and answering questions on a Thursday afternoon), I thought I would close this one off.

1）Cython不喜欢对具有功能/方法引用的变量。这些可变副本将失败。据我所知，没有解决方法，您只需要提出不需要它们的新设计即可。我最终在上面和我的项目中使用了相同的代码。

1) Cython doesn't like deepcopy on Classes which have function/method referenced variables. Those variable copies will fail. From what I can tell, there's no working around it, you just have to come up with an new design that doesn't require them. I ended up doing so with the same code above, and in my project.

2）Cython根本不处理属性装饰器。您不能 @属性和 @ <属性名称> .setter 。需要以旧的方式设置属性。例如<属性名称> = property（get_property，set_property）。

2) Cython doesn't handle the property decorators at all. You can't @property and @<property name>.setter. Properties need to be set the old fashion way. e.g. <property name> = property(get_property, set_property).

3）无法访问继承的非Cython类的方法可能。我知道这个含糊。我无法完全解释。我要说的是我继承了 NetworkX.DiGraph ，而在Cython之后，当我无法访问 number_of_nodes（）时，它是直接的Python。我必须创建该方法的引用并使用它。例如 number_of_verts = NetworkX.DiGraph.number_of_nodes 。

3) An inherited non-Cython class's methods "might" not be accessible. I know this vague. I can't completely explain it. All I'll say is I was inheriting NetworkX.DiGraph, and number_of_nodes() was no accessible after Cython, when it was straight Python. I had to create a reference to the method and use it. e.g. number_of_verts = NetworkX.DiGraph.number_of_nodes.

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