Jupyter Doesn't Rememer Variables and Deffinitions Across Cells

When I go to the next cell and reference variables from the previous cell, I get a reference/undefined error in Python. I wonder if it’s something to do with the settings or configuration of the cells, because the solution notebook I saw on Github didn’t have this problem.

Hi @skis630

Whenever you start your Jupyter either locally or on Dataquest Server, press the Kernel button on the navbar, then Restart & Run all the cells show that all the cells get executed sequentially.

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