問題描述

Windows 上的 Python 3.5，試試這些:

Python 3.5 on windows, try these:

import ssl, pickle, multiprocessing
context = ssl.create_default_context()
foo = pickle.dumps(context)
pickle.loads(foo)

拋出異常:

TypeError: __new__() missing 1 required positional argument: 'protocol'

multiprocessing.Process 的子類拋出同樣的異常:

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()

推薦答案

這樣的東西應該可以工作:

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，一個 SSLContext 需要一個 protocol，并且無論出于何種原因，protocol 都不會被保存(例如，它不在 >__reduce__ 方法)當實例被腌制時.如果您需要更多狀態(即 __init__ 方法中的其他 args 和 kwds)，那么您需要從上面的 save_sslcontext 函數.(注意，如果你在 python 2.x 中，那么適當的模塊是 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).

這篇關于如何腌制 ssl.SSLContext 對象的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！