What are you trying to do? The keyboard
provides the information on the key. If you want the resulting text, I recommend using the TextInput widget.
Kivy Keyboard Input: Key Events vs Text Input
Quick clarification on keyboard handling in Kivy:
Use key events (on_key_down)
for:
Keyboard shortcuts (Ctrl+C, Ctrl+Z)
Game controls (WASD, arrows)
Physical key/location-based logic
Use TextInput for:
Typing into text fields
Proper keyboard layout handling (QWERTY, AZERTY, IME)
Unicode characters
Dead keys and compose sequences
In short: key events are for keys, text input is for characters.