Coursera behavior

Hi! I understand your frustration about the possible incorrect grader feedback. A few learners have reported it as well and I’ve forwarded the concern to Coursera for checking. In the meantime, there is a workaround that might resolve your issue. In a nutshell, you’ll need to get a fresh copy of the notebook and paste your solutions there. Please take a look at this thread for details: C2W1 Assignment - grader output showed error - #4 by chris.favila .

And here are additional things you may need to watch out for:

  1. There should not be any cell in the notebook that throws an error. Otherwise, the grader will halt and not give a partial grade. This usually stems from submitting an assignment without completing all the exercises (e.g. doing Exercise 1 then pressing Submit immediately)
  2. You may have renamed the notebook and pressed the Submit button there. The grader expects the default filename when grading. That is the file opened when you launch the notebook from the Coursera classroom. For example, if the default filename is C2W1_Assignment.ipynb , then the grader will grade that notebook even if you pressed the Submit button from C2W1_Assignment_2021_05_11.ipynb

Hope this helps! If not, feel free to update here. Thanks!