Ascii codes are not correct

[g3rb3n]

Many ascii codes are incorrect. 'X', 'K' and '_' do have code 0 according to the code. Many other keys like arrow keys get an ascii code from 81 to 84, while those are reserved for QRST.

[g3rb3n]

lstrip removes all specified characters.
https://python-reference.readthedocs.io/en/latest/docs/str/lstrip.html

so 'XK_X'.lstrip('XK_') will result in an empty string.

return name.lstrip("XK_")

Should be

return name[3:]

[g3rb3n]

return number % 256

will result in overlapping asciivalues

return number if number < 256 else 0

won't