Python 3.6 loading pickle file error ModuleNotFoundError: What should I do if I load pickle file '__builtin__'?

When loading a pickle file in Python 3.6 environment, I encountered ModuleNotFoundError: No module named '__builtin__' error. How to solve it?

This article analyzes and provides solutions for this error that occurs when using pickle to load .pkl files in Python 3.6.12 environment. Suppose the user tries to load the m30k_deen_shr.pkl file in the test.py file (the project directory structure is omitted here).

The reason for the error is the __builtin__ module. This is a module in Python 2.x, whose functionality has been integrated into the builtins module in Python 3.x. Therefore, this error indicates that the loaded .pkl file is most likely generated with Python 2.x.

The pickle file is strongly related to the Python version. Different Python versions handle pickle formats differently, which leads to Python 3.x not being able to correctly parse .pkl files generated by Python 2.x.

Solution:

1. Check the file source: Confirm the Python version used for the generated code of the m30k_deen_shr.pkl file. If it is Python 2.x, you need to re-use Python 3.x to generate the file.

2. Use the correct write mode: When writing files using pickle, be sure to use wb mode ( open(..., 'wb') ) to avoid problems such as line breaks caused by text mode writing, which causes loading failure.

3. Regenerate .pkl file: Reprocess the data using Python 3.x code and serialize it into .pkl file. Make sure to perform serialization operations in Python 3.x environment.

After completing the above steps, try to load the .pkl file in Python 3.6 environment again to resolve ModuleNotFoundError: No module named '__builtin__' error.

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