Course 2, Week 2 "ModuleNotFoundError" Error

Course Q&A Deep Learning Specialization Improving Deep Neural Networks: Hyperparameter tun
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All good points! The other thing to remember is you need to delete all the “dot py” files e.g. public_tests.py when you do the “refresh” in order to make sure you get the new versions.

All that is mentioned on the relevant topic on the FAQ Thread.