kmk_firmware/docs/en/extension_stringy_keymaps.md

Stringy Keymaps

Enables referring to keys by 'NAME' rather than KC.NAME.
This extension allows for a seamless integration of both string-based key references and standard keycodes.

For example:

from kmk.extensions.stringy_keymaps import StringyKeymaps

# Normal
# keyboard.keymap = [[ KC.A, KC.B, KC.RESET ]]

# Indexed
# keyboard.keymap = [[ KC['A'], KC['B'], KC['RESET'] ]]

# String names mixed with normal keycodes
# keyboard.keymap = [[ 'A' , KC.B, KC.RESET ]]

# String names
keyboard.keymap = [[ 'A' , 'B', 'RESET' ]]

stringyKeymaps = StringyKeymaps()

# Enabling debug will show each replacement or failure.
# This is recommended during the initial development of a keyboard.
# stringyKeymaps.debug_enable = True

keyboard.extensions.append(stringyKeymaps)

It should be noted that these are not ASCII. The string is not what will be sent to the computer. The examples above have no functional difference.

When utilizing argumented keys, such as KC.MO(layer), it's not possible to use a string like 'MO(layer)' instead employ the standard notation of e.g. KC.MO(1) in your keymap.