key_pressed = chr(imp).upper()

[huwwp]

stdscr.getch() returns an integer, can't perform upper

[cclauss]

chr() converts an integer into single character str which you can do upper() on.

python -c "print(chr(65) + chr(97))" # --> 'Aa'

[huwwp]

My bad. getch defaults to -1 in curses no delay mode which we can't call chr on. Could wrap in another if to check before calling chr on it, current branch doesn't run for me

[huwwp]

It also breaks consistency on the first loop checking keycodes to later check for chr for no real gain. I'd rather not for readability.