yes I know google know everething but what do double question marks in your case?

Nice kata. I had fun solving this:)

take pencil and sheet of paper. then start draw balls. It's helped me.

after refreshing still I see this two testcases.

still is problem in basic testcase:
test.assert_equals(switcher(['25','7','8','0','4','14','23','8','25','23','29','16','16','4']), 'btswmdsbd kkw') test.assert_equals(switcher(['12','28','25','21','25','7','11','22','0','15']), 'o?bfbtpel' )

keep atention on '0' in both testcases:
in first '0' is 'w'
in second '0' is 'e'
Or this is trickey kata :)

what is wrong whit this key '0'. Somtimes is 'w' in other time is 'e'. How I can interpret this key? issue is directed to Python. On Rust work well.

If any have some doubts, Yes we must to replace any sevens to ones.

I don't undarstand Then replace any incidence of the number 7 with the number 1? I must replace all sevens to ones. This describle confusing me.

You import use itertools::Itertools; but where you use this Itertools? This import is necessary? To run arr.iter()?
I am new in Rust so I have many questions.

syntax and layout in your code are similar to python :)

hey my code was ugly ,not efficient and complicated because I factor this task for 4 steps with recursion so don't take example from my :)

for me this kata was painful...

I have some issue with description. What do you mean: "positive integer num has not been correctly chosen."?

I dont undarstand discription: 67890 is the greatest sequence of 5 consecutive digits. 0 < 9 so why this array this sequence is correct?

damn. You are right I dont know why i looking for anagrams...probably I mixed this kata with another. thx for response :)