example of evdev/uinput based remapping, probably not the best one

pedal.py

import os
import atexit

import uinput
import evdev


#os.system('sudo modprobe uinput')

MAPPING = {
    evdev.ecodes.KEY_A: uinput.KEY_ESC,
    evdev.ecodes.KEY_B: uinput.KEY_END,
    evdev.ecodes.KEY_C: uinput.KEY_ENTER,
}

device = uinput.Device(MAPPING.values(), name='Pedal keys')

PATH = '/dev/input/by-id/usb-PCsensor_FootSwitch3-F1.8-event-mouse'
in_dev = evdev.InputDevice(PATH)
atexit.register(in_dev.ungrab)
in_dev.grab()

for event in in_dev.read_loop():
    if event.type == evdev.ecodes.EV_KEY:
        device.emit(MAPPING[event.code], event.value)