Hook mouse event, then generate keyboard event.

mouse_hook.py

#!/usr/bin/env python
#-*- coding: utf-8 -*-
 
from evdev import UInput, ecodes as e
from asyncore import file_dispatcher, loop
from evdev import InputDevice, categorize, ecodes
from select import select
 
dev = InputDevice('/dev/input/event4')
print(dev)
devices = [dev]
 
def press_key(key):
    ui = UInput()
    # accepts only KEY_* events by default
    ui.write(e.EV_KEY, key, 1)  # KEY_A down
    ui.write(e.EV_KEY, key, 0)  # KEY_A up
    ui.syn()
    ui.close()
 
while True:
    r,w,x = select(devices, [], [])
    for fd in r:
        for event in dev.read():
            if event.code == 272 and event.value == 1:
                press_key(e.KEY_A)
                print 'press mouse left'
            elif event.code == 273 and event.value == 1:
                press_key(e.KEY_B)
                print 'press mouse right'