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I also was not able to complete this kata. The sample test kept returning:
"Expected an error on plus_one("pineapple"): ['Please enter a number: ', ''] should equal ['Please enter a number: ', 'PASSED::Test Passed']"
I think there is an issue with this kata. No matter what I do, there is an extra blank line of output ('') before "PASSED::" or "FAILED::".
Thank you! I was really beating my head against the wall on this one. Before changing these test statements, the program kept printing a value of "None". When I changed it to what you suggested though it worked.