ValueError: unsupported pickle protocol: 3, python2 pickle无法加载python 3 pickle转储的文件？
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ValueError: unsupported pickle protocol: 3, python2 pickle can not load the file dumped by python 3 pickle?
提问by Aleeee
I use pickle to dump a file on python 3, and I use pickle to load the file on python 2, the ValueError appears.
我使用pickle在python 3上转储文件，我使用pickle在python 2上加载文件，出现ValueError。
So, python 2 pickle can not load the file dumped by python 3 pickle?
那么，python 2 pickle 无法加载python 3 pickle 转储的文件？
If I want it? How to do?
如果我想要？怎么做？
采纳答案by Matthias
You should write the pickled data with a lower protocol number in Python 3. Python 3 introduced a new protocol with the number 3(and uses it as default), so switch back to a value of 2which can be read by Python 2.
您应该在 Python 3 中使用较低的协议编号编写腌制数据。Python 3 引入了带有编号的新协议3（并将其用作默认值），因此切换回2Python 2 可以读取的值。
Check the protocolparameter in pickle.dump. Your resulting code will look like this.
检查中的protocol参数pickle.dump。您生成的代码将如下所示。
pickle.dump(your_object, your_file, protocol=2)
There is no protocolparameter in pickle.loadbecause picklecan determine the protocol from the file.
因为可以从文件中确定协议中没有protocol参数。pickle.loadpickle
回答by enrico.bacis
Pickle uses different protocolsto convert your data to a binary stream.
Pickle 使用不同的protocols方法将您的数据转换为二进制流。
In python 2 there are 3 different protocols(
0,1,2) and the default is0.In python 3 there are 5 different protocols(
0,1,2,3,4) and the default is3.
You must specify in python 3 a protocol lower than 3in order to be able to load the data in python 2. You can specify the protocolparameter when invoking pickle.dump.
您必须在 python 3 中指定低于的协议3才能在 python 2 中加载数据。您可以protocol在调用时指定参数pickle.dump。
