python - 如何通过cloudpickle来pickle python-attrs类函数？

Question

我正在使用 cloudpickle 传递函数，并且我想通过 cloudpickle 传递 attrs 类函数。

import pickle
import attr

@attr.s(auto_attribs=True)
class myclass:
    an_int: int
    a_str: str
    a_float: float

    def myfunc(self):
        return f"{self.an_int} + {self.a_str} + {self.a_float}"

mc = myclass(1, "test", 2.4)
f = pickle.loads(pickle.dumps(mc.myfunc))
print(f())

运行它给我1 + test + 2.4

虽然cloudpickle实现

import attr
import cloudpickle

@attr.s(auto_attribs=True)
class myclass:
    an_int: int
    a_str: str
    a_float: float

    def myfunc(self):
        return f"{self.an_int} + {self.a_str} + {self.a_float}"

mc = myclass(1, "test", 2.4)
f = cloudpickle.loads(cloudpickle.dumps(mc.myfunc))
print(f())

给我错误:TypeError:无法pickle _thread._local对象(我将在底部发布完整的错误日志)

我确信我需要实现一些 __getstate__ 或 __reduce__ 函数来让 cloudpickle 来 pickle 类，但我已经尝试过这两种方法，但没有任何运气。

添加功能:

def __reduce__(self):
    return (self.__class__, (self.an_int, self.a_str, self.a_float))

给出同样的错误

为了实现这一目标，我应该实现什么？

Python错误日志:

Traceback (most recent call last):
  File "x.py", line 16, in <module>
    f = cloudpickle.loads(cloudpickle.dumps(mc.myfunc))
  File "/home/me/.local/share/pyenv/versions/3.7.0/lib/python3.7/site-packages/cloudpickle/cloudpickle.py", line 917, in dumps
    cp.dump(obj)
  File "/home/me/.local/share/pyenv/versions/3.7.0/lib/python3.7/site-packages/cloudpickle/cloudpickle.py", line 268, in dump
    return Pickler.dump(self, obj)
  File "/home/me/.local/share/pyenv/versions/3.7.0/lib/python3.7/pickle.py", line 437, in dump
    self.save(obj)
  File "/home/me/.local/share/pyenv/versions/3.7.0/lib/python3.7/pickle.py", line 504, in save
    f(self, obj) # Call unbound method with explicit self
  File "/home/me/.local/share/pyenv/versions/3.7.0/lib/python3.7/site-packages/cloudpickle/cloudpickle.py", line 689, in save_instancemethod
    self.save_reduce(types.MethodType, (obj.__func__, obj.__self__), obj=obj)
  File "/home/me/.local/share/pyenv/versions/3.7.0/lib/python3.7/pickle.py", line 638, in save_reduce
    save(args)
  File "/home/me/.local/share/pyenv/versions/3.7.0/lib/python3.7/pickle.py", line 504, in save
    f(self, obj) # Call unbound method with explicit self
  File "/home/me/.local/share/pyenv/versions/3.7.0/lib/python3.7/pickle.py", line 771, in save_tuple
    save(element)
  File "/home/me/.local/share/pyenv/versions/3.7.0/lib/python3.7/pickle.py", line 549, in save
    self.save_reduce(obj=obj, *rv)
  File "/home/me/.local/share/pyenv/versions/3.7.0/lib/python3.7/pickle.py", line 633, in save_reduce
    save(cls)
  File "/home/me/.local/share/pyenv/versions/3.7.0/lib/python3.7/pickle.py", line 504, in save
    f(self, obj) # Call unbound method with explicit self
  File "/home/me/.local/share/pyenv/versions/3.7.0/lib/python3.7/site-packages/cloudpickle/cloudpickle.py", line 664, in save_global
    return self.save_dynamic_class(obj)
  File "/home/me/.local/share/pyenv/versions/3.7.0/lib/python3.7/site-packages/cloudpickle/cloudpickle.py", line 511, in save_dynamic_class
    save(clsdict)
  File "/home/me/.local/share/pyenv/versions/3.7.0/lib/python3.7/pickle.py", line 504, in save
    f(self, obj) # Call unbound method with explicit self
  File "/home/me/.local/share/pyenv/versions/3.7.0/lib/python3.7/pickle.py", line 856, in save_dict
    self._batch_setitems(obj.items())
  File "/home/me/.local/share/pyenv/versions/3.7.0/lib/python3.7/pickle.py", line 882, in _batch_setitems
    save(v)
  File "/home/me/.local/share/pyenv/versions/3.7.0/lib/python3.7/pickle.py", line 504, in save
    f(self, obj) # Call unbound method with explicit self
  File "/home/me/.local/share/pyenv/versions/3.7.0/lib/python3.7/site-packages/cloudpickle/cloudpickle.py", line 408, in save_function
    self.save_function_tuple(obj)
  File "/home/me/.local/share/pyenv/versions/3.7.0/lib/python3.7/site-packages/cloudpickle/cloudpickle.py", line 573, in save_function_tuple
    save(state)
  File "/home/me/.local/share/pyenv/versions/3.7.0/lib/python3.7/pickle.py", line 504, in save
    f(self, obj) # Call unbound method with explicit self
  File "/home/me/.local/share/pyenv/versions/3.7.0/lib/python3.7/pickle.py", line 856, in save_dict
    self._batch_setitems(obj.items())
  File "/home/me/.local/share/pyenv/versions/3.7.0/lib/python3.7/pickle.py", line 882, in _batch_setitems
    save(v)
  File "/home/me/.local/share/pyenv/versions/3.7.0/lib/python3.7/pickle.py", line 504, in save
    f(self, obj) # Call unbound method with explicit self
  File "/home/me/.local/share/pyenv/versions/3.7.0/lib/python3.7/pickle.py", line 856, in save_dict
    self._batch_setitems(obj.items())
  File "/home/me/.local/share/pyenv/versions/3.7.0/lib/python3.7/pickle.py", line 882, in _batch_setitems
    save(v)
  File "/home/me/.local/share/pyenv/versions/3.7.0/lib/python3.7/pickle.py", line 524, in save
    rv = reduce(self.proto)
TypeError: can't pickle _thread._local objects

Answer 1

这是由于 attrs 使用线程局部变量来破坏 __repr__ 中的对象循环而导致的，而 cloudpickle 不喜欢这样。作为引用，https://github.com/python-attrs/attrs/pull/358中有介绍。 .

您的快速解决方法是设置@attr.s(repr=False)，但请随时在我们的错误跟踪器上提出问题，我们可以讨论如何继续。