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  1. 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 2 which can be read by Python 2.

    Check the protocolparameter in pickle.dump. Your resulting code will look like this.

    pickle.dump(your_object, your_file, protocol=2)

    There is no protocolparameter in pickle.load because pickle can determine the protocol from the file.

  2. 参考答案2
  3. Pickle uses different protocols to convert your data to a binary stream.

    You must specify in python 3 a protocol lower than 3 in order to be able to load the data in python 2. You can specify the protocol parameter when invoking pickle.dump.