When I’m trying to run code on my lab it keeps saying error.
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Perhaps when you opened the notebook, you did not run the first cell - where numpy is imported and assigned as ‘np’.
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Thank you! That was the problem.
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Tip: Every time you open a notebook, run all of the cells starting from the top.
Jupyter will save your notebook automatically (every few minutes), but it does not save the state of the runtime environment. So you have to re-create it by running all of the cells.
Tip 2: Before you submit a notebook for grading, be sure you use “Save and Checkpoint” first.