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Hi Shaan,
It does not seem to be the problem with your code. The same code works well in my case. Can you refresh your lab by going to âHelpâ and then clicking on âGet latest versionâ? The âHelpâ button is on the top right corner.
âGet latest versionâ only works to update missing files. So it wonât give you the newest version of a file you already have.
I think you may have an obsolete version of the w1_unittest.py file.
You can try deleting it (via the Files menu), and then use âGet latest versionâ.
Maybe restart the kernel and clean all outputs work.

