Capturing user keystrokes in Python on Linux

Question

import pyHook
import pythoncom

def tecla_pressionada(evento):
   # print("Alguma tecla pressionada")
    print (chr(evento.Ascii))

hook = pyHook.HookManager()
hook.KeyDown = tecla_pressionada #sem ()
hook.HookKeyboard()

pythoncom.PumpMessages() #cria loop infinito e espera mensagens do SO

The above code works with the library pyHook for Windows.

How to make a similar code in Python for Linux?

Answer 1

You can use the pyxhook:

#!/usr/bin/env python

import pyxhook

def OnKeyPress(event):
    print (event.Key)

    # Pressione <space> para terminar o script
    if event.Ascii == 32:
        exit(0)

hm = pyxhook.HookManager()
hm.KeyDown = OnKeyPress

hm.HookKeyboard()

hm.start()

To use the pyxhook do the following:

1. Copy the code of that page and save the file as pyxhook.py in the same folder as yours script.

2. If you haven’t installed the Xlib install:

   sudo apt-get install python-xlib
   

Answer 2

Complementing the response of stderr, I found out by chance the following:

When executing the above code and pressing any key, a Key, example (image):

I just changed the code by adding the Key generated, being as follows:

#!/usr/bin/env python

import pyxhook

def OnKeyPress(event):
    print (event.Key)

# Pressione <Ctrl> para terminar o script
if event.Key == "Control_L":
    exit(0)

hm = pyxhook.HookManager()
hm.KeyDown = OnKeyPress

hm.HookKeyboard()
hm.start()

If you want to check if the letter "b" has been pressed, just add the Key bb, and so on.