Home/ Questions/The easy way to handle error - valueerror: unsupported pickle protocol: 3
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Leila O'Kelly
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Asked: 2022-05-18T16:05:07+00:00 In:

The easy way to handle error – valueerror: unsupported pickle protocol: 3

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I get the “Valueerror: unsupported pickle protocol: 3” issue when trying to use pickle to dump a file on python 3, and I use pickle to load the file on python 2. Here is the detail of the error I got the error message:

ValueError: unsupported pickle protocol: 3, python2 pickle can not load the file dumped by python 3 pickle?

Please give me some advice to solve this problem.

unsupported pickle protocol
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2 Answers

  1. Best Answer
    Expert

    The cause: Pickles’ compatibility with different Python versions is not entirely supported. An error such as “Valueerror: unsupported pickle protocol: 3” will generally result from such conversion and loading between distinct Python versions.

    Solution: Python 3 should be used to write the pickled data with a lower protocol number. Return to a value of 2 that Python 2 can read since Python 3 established a new protocol with the number 3 (and takes it as default).

    In pickle.Dump, look at the protocol parameter. This is how your finished code will appear.

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

     

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  2. Pickle uses a different protocols to convert data into a binary stream.

    • In Python 2, there are three different protocols (0 1 2), and the default is 0.

    • In Python 3, there are 5 different protocols (0 to 1, 2, and 3), with the default being 3.

    To load data into python 2, you must specify in Python 3 a lower protocol than 3 When invoking , you can specify protocol.

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