Windows 上的 Python 3.5,试试这些:
Python 3.5 on windows, try these:
import ssl, pickle, multiprocessing
context = ssl.create_default_context()
foo = pickle.dumps(context)
pickle.loads(foo)
抛出异常:
TypeError: __new__() missing 1 required positional argument: 'protocol'
multiprocessing.Process 的子类抛出同样的异常:
subclass of multiprocessing.Process throws the same exception:
class Foo(multiprocessing.Process):
def __init__(self):
super().__init__()
self.context = ssl.create_default_context()
def run(self):
pass
if __name__ == '__main__':
foo = Foo()
foo.start()
这样的东西应该可以工作:
Something like this should work:
>>> import pickle, copyreg, ssl
>>>
>>> def save_sslcontext(obj):
... return obj.__class__, (obj.protocol,)
...
>>> copyreg.pickle(ssl.SSLContext, save_sslcontext)
>>>
>>> context = ssl.create_default_context()
>>> foo = pickle.dumps(context)
>>> _foo = pickle.loads(foo)
>>> _foo
<ssl.SSLContext object at 0x1011812a8>
>>> _foo.protocol
2
>>>
基本上,一个 SSLContext 需要一个 protocol,并且无论出于何种原因,protocol 都不会被保存(例如,它不在 >__reduce__ 方法)当实例被腌制时.如果您需要更多状态(即 __init__ 方法中的其他 args 和 kwds),那么您需要从上面的 save_sslcontext 函数.(注意,如果你在 python 2.x 中,那么适当的模块是 copy_reg).
Basically, a SSLContext needs a protocol, and for whatever reason, the protocol is not saved (e.g. it's not in a __reduce__ method) when the instance is pickled. If you need more state (i.e. other args and kwds from the __init__ method), then you'll need to extend the return value from the save_sslcontext function above. (Note, if you are in python 2.x, then the appropriate module is copy_reg).
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