Explain what gives "" pls
I really dont understand((((

I'm not a great coder (just adding that up front), but I have used the Kata to get better (I think, and hope). My approach is to solve the problem however I can. Once I have code that is good enough, I go back to it and see if I can tidy it myself. If not, fair enough. Submit, and then I read other solutions.

For the other solutions I read and try and udnerstand them. I try and work out a the solution seems to be showing off (just trying to use the least lines of code for reasons I don't understand), or if they are doing something I would like to learn.

If a solution is doing something I want to learn I may try and use that on the next kata, or just go and read up on it.

Every so often I go back to solutions I wrote long enough ago that I think (hope), I am know significantly better. I then try rewriting with my current knowledge. I leave it awhile because if I have just learnt something new from another solution and try using it, chances are fi am just copying someones elses approach, not really understanding and applying it.

I had another onstance of this, one (I assume random), test fails. But if I try again and don't get that test I pass. The test that catches my code is:
['69', '83', '53', '62', '52', '10', '79', '30', '33', '89', '26', '45', '75', '51', '25', '73', '52', '100', '82', '6', '20']
'101002025263033455152525362669737579828389' should equal '100102025263033455152525362669737579828389'

The test ['10','100'] causes my code to fail.

I have checked the validity of this kata and working fine since 2 years ago.
I don't know about the list but it should be another problem if it could not detect the fix of the katas.

Is this kata currently working (in python)? There was old discussion of it being broken, and I assume it was fixed, but it is also listed on github as having broken tests.

If it's working, then I'm stumped :(

In the code you have included you are printing your solution, you need to return it.