Just a heads up I failed a random test and then passed when I resubmitted without changing anything in my code, suggesting there may be an issue with the random tests. I failed on inputs (3, 3, 40??), I'm sorry I didn't save it because I was wxpecting to fail again and troubleshoot from there. Anyway, I would look at what happens when s1==s2 and ensure everything is defined/explained clearly.

If you're still struggling with this one:

how does your solution handle invalid inputs(according to the prompt)?

Check your conditions. I had this issue because I wasn't dealing with the inputs correctly per the prompt. Once I cleaned up my conditionals it passed without issue.

Not sure if this is what's happening to you, but just wanted to mention since it's a similar result.

Here's a quick breakdown comparing:

x = y

x = y[:]

x = y.copy()

https://www.programiz.com/python-programming/methods/list/copy

1 year later and I'd like to bump this. I'm very curious to know what of my solutions have been upvoted so I can get a better idea of what other programmers think is good in my code.

Did you ever figure this one out? I'm getting the same error and I have no idea what it means.

edit: actually, I'm getting it before the second "Base clsas check", but it's the same TypeError.

Can someone unpack this? How does this create the zigzag?

3 years later and I had to come to the comments to figure out what type of answer this kata was looking for, I'm glad your post was here.

I don't know what happened. When I tried the sample tests I failed every one, but when I clicked Attempt I passed them all. I think something is broken in the tests for python.

{'JGEVB': 1, 'OUDCN': 2, 'MXLAS': 3, 'ZWTYP': 4, 'RQIHF': 5}

This was my random alpha, you'll notice K is the letter that was skipped. If you add up the letters of "Luke Skywalker" that exist you get 29. But the test says the correct response is 41. I keep failing tests, but when I add up the example from the random alpa given it matches what my code outputs, not what the expected result is. What am I missing?

Much obliged.

Is there a way to see the tests? I'm failing on basic test five but there's no details so I don't know what to adjust.