我有以下代码，用于装饰该类:
import dill
from collections import namedtuple
from multiprocessing import Process
def proxified(to_be_proxied):
b = namedtuple('d', [])
class Proxy(to_be_proxied, b):
pass
Proxy.__name__ = to_be_proxied.__name__
return Proxy
@proxified
class MyClass:
def f(self):
print('hello!')
pickled_cls = dill.dumps(MyClass)
def new_process(clazz):
dill.loads(clazz)().f()
p = Process(target=new_process, args=(pickled_cls,))
p.start()
p.join()
当我尝试 pickle 装饰类时，出现以下错误:
Traceback (most recent call last):
File "/usr/lib/python3.5/pickle.py", line 907, in save_global
obj2, parent = _getattribute(module, name)
File "/usr/lib/python3.5/pickle.py", line 265, in _getattribute
.format(name, obj))
AttributeError: Can't get local attribute 'proxified.<locals>.Proxy' on <function proxified at 0x7fbf7de4b8c8>
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/home/carbolymer/example.py", line 108, in <module>
pickled_cls = dill.dumps(MyClass)
File "/usr/lib/python3.5/site-packages/dill/dill.py", line 243, in dumps
dump(obj, file, protocol, byref, fmode, recurse)#, strictio)
File "/usr/lib/python3.5/site-packages/dill/dill.py", line 236, in dump
pik.dump(obj)
File "/usr/lib/python3.5/pickle.py", line 408, in dump
self.save(obj)
File "/usr/lib/python3.5/pickle.py", line 475, in save
f(self, obj) # Call unbound method with explicit self
File "/usr/lib/python3.5/site-packages/dill/dill.py", line 1189, in save_type
StockPickler.save_global(pickler, obj)
File "/usr/lib/python3.5/pickle.py", line 911, in save_global
(obj, module_name, name))
_pickle.PicklingError: Can't pickle <class '__main__.proxified.<locals>.Proxy'>: it's not found as __main__.proxified.<locals>.Proxy
如何使用 dill 来 pickle 装饰类？我想通过将此类作为参数传递给单独的进程 - 也许有更简单的方法来做到这一点？
最佳答案
Gaël Varoquaux can be found here 提供的“为什么 pickling 修饰函数很痛苦”的一个很好的解释。 .
基本上使用 functools.wraps 重写类可以避免这些问题:)
关于Python- dill : Can't pickle decorated class，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/40026897/