ImportError: Model A references Model B, Model B references Model A?

A Python module is imported by executing it top to bottom in a new namespace. When module A imports module B, the evaluation of A.py is paused until module B is loaded. When module B then imports module A, it gets the partly-initialized namespace of module A -- in your case, it lacks the ModelA class because the import of myproject.modelb.

Models happens before the definition of that class.

Mutual imports usually mean you've designed your models incorrectly.

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