Very nice kata on encoding.

use str.isdecimal()
for checking if it's Numeric mode (0-9) in Python

Thank you. Added fixed test to C#, Java, JavaScript, Julia, PHP, Python, Ruby and TypeScript.

Thank you. Fixed.

approved 🚽

LGTM, Approved!

[Python] update to new test framework: https://www.codewars.com/kumite/649ec120b3856c10bcc2e779?sel=649ec120b3856c10bcc2e779

Approved

Typo: Seperate the message string -> Split the message string

Fixed reference solution and added sample/fixed test for all 3 problematic chars.

ValueError: invalid literal for int() with base 10: '³3'

Is that normal I get weird chars in the input? (python ; random tests ; edit: got the error one time only, trying to reproduce in a fork, right now)

If so, this should be tested as fixed tests too (both sample tests and full test suite)

edit²: happens in bytes mode / the ref solution is failing in the very same way on this kind of inputs => the range should be limited, when creating the input

I actually just realized it's a problem of clarity of the description (which is pretty "opaque"...)

=> what's defining the alphanum mode it "only chars contained in the provided alphanumeric string/variable"

if the string only contains characters from the alphanumeric table, use the alphanumeric mode

Changed.

Otherwise if the string only contains alphanumeric chars, then encode it with the alphanumeric mode.

this is incorrect: whitespaces are converted with alphanum mode too while they aren't "alhpanumeric"

Prefix: 0001
Length: 0000000010

The message encodes to 1000 and not 0001000, because the tuple (in this case length 2) has a leading zero and theirfor is encoded into 4 bits -> 1000

Complete message: 0001000000001010000

Changed the kata description to be a bit more specific.