[英]How to pickle python-attrs class functions via cloudpickle?
我正在使用 cloudpickle 来传递函数,我想通过 cloudpickle 传递一个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())
运行这给了我1 + test + 2.4
而 cloudpickle 的实现
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())
给了我错误: TypeError: can't pickle _thread._local objects
(我将在底部发布完整的错误日志)
我相信我需要实现一些__getstate__
或__reduce__
函数来让 cloudpickle 对类进行腌制,但我已经尝试过两者都没有任何运气。
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,我应该实施什么?
蟒蛇错误日志:
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
这是由于attrs
使用线程__repr__
来分解__repr__
对象循环,而 cloudpickle 不喜欢这样。 作为参考,它是在https://github.com/python-attrs/attrs/pull/358中介绍的。
您的快速解决方法是设置@attr.s(repr=False)
但随时在我们的错误跟踪器上打开一个问题,我们可以讨论如何继续。
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