The Plan class is trying to access an attribute self.plan, which has been renamed to self.generated_plan. You need to update the code in the BasicPlanner class to use the correct attribute name.

Might it be that pip is not removing the multiarray, umath c-extension modules when upgrading? Since we unified them into one c-extension module _multiarray_umath, we created pure-python shims. But if ...

In this article, we're taking a look at "Attributeerror: bytes object has no object read" error in Python, and how to fix the problem.