翻译强力驱动Is there a way to do key listeners in python without a huge bloated module such as pygame?
An example would be, when I pressed the a key it would print to the console
The a key was pressed!
It should also listen for the arrow keys/spacebar/shift key.
It's unfortunately not so easy to do that. If you're trying to make some sort of text user interface, you may want to look into curses. If you want to display things like you normally would in a terminal, but want input like that, then you'll have to work with termios, which unfortunately appears to be poorly documented in Python. Neither of these options are that simple, though, unfortunately. Additionally, they do not work under Windows; if you need them to work under Windows, you'll have to use PDCurses as a replacement for curses or pywin32 rather than termios.
I was able to get this working decently. It prints out the hexadecimal representation of keys you type. As I said in the comments of your question, arrows are tricky; I think you'll agree.
#!/usr/bin/env python import sys import termios import contextlib @contextlib.contextmanager def raw_mode(file): old_attrs = termios.tcgetattr(file.fileno()) new_attrs = old_attrs[:] new_attrs[3] = new_attrs[3] & ~(termios.ECHO | termios.ICANON) try: termios.tcsetattr(file.fileno(), termios.TCSADRAIN, new_attrs) yield finally: termios.tcsetattr(file.fileno(), termios.TCSADRAIN, old_attrs) def main(): print 'exit with ^C or ^D' with raw_mode(sys.stdin): try: while True: ch = sys.stdin.read(1) if not ch or ch == chr(4): break print '%02x' % ord(ch), except (KeyboardInterrupt, EOFError): pass if __name__ == '__main__': main()Here's how can do it on Windows:
""" Display series of numbers in infinite loop Listen to key "s" to stop Only works on Windows because listening to keys is platform dependent """ # msvcrt is a windows specific native module import msvcrt import time # asks whether a key has been acquired def kbfunc(): #this is boolean for whether the keyboard has bene hit x = msvcrt.kbhit() if x: #getch acquires the character encoded in binary ASCII ret = msvcrt.getch() else: ret = False return ret #begin the counter number = 1 #infinite loop while True: #acquire the keyboard hit if exists x = kbfunc() #if we got a keyboard hit if x != False and x.decode() == 's': #we got the key! #because x is a binary, we need to decode to string #use the decode() which is part of the binary object #by default, decodes via utf8 #concatenation auto adds a space in between print ("STOPPING, KEY:", x.decode()) #break loop break else: #prints the number print (number) #increment, there's no ++ in python number += 1 #wait half a second time.sleep(0.5)There is a way to do key listeners in python. This functionality is available through pynput.
Command line:
> pip install pynputPython code:
from pynput import ket,listener # your code hereI was searching for a simple solution without window focus. Jayk's answer, pynput, works perfect for me. Here is the example how I use it.
from pynput import keyboard def on_press(key): try: k = key.char # single-char keys except: k = key.name # other keys if key == keyboard.Key.esc: return False # stop listener if k in ['1', '2', 'left', 'right']: # keys interested # self.keys.append(k) # store it in global-like variable print('Key pressed: ' + k) return False # remove this if want more keys lis = keyboard.Listener(on_press=on_press) lis.start() # start to listen on a separate thread lis.join() # no this if main thread is polling self.keyssudo pip install keyboardTake full control of your keyboard with this small Python library. Hook global events, register hotkeys, simulate key presses and much more.
From README.md:
import keyboard keyboard.press_and_release('shift+s, space') keyboard.write('The quick brown fox jumps over the lazy dog.') # Press PAGE UP then PAGE DOWN to type "foobar". keyboard.add_hotkey('page up, page down', lambda: keyboard.write('foobar')) # Blocks until you press esc. keyboard.wait('esc') # Record events until 'esc' is pressed. recorded = keyboard.record(until='esc') # Then replay back at three times the speed. keyboard.play(recorded, speed_factor=3) # Type @@ then press space to replace with abbreviation. keyboard.add_abbreviation('@@', 'my.long.email@example.com') # Block forever. keyboard.wait()Although I like using the keyboard module to capture keyboard events, I don't like its record() function because it returns an array like [KeyboardEvent("A"), KeyboardEvent("~")], which I find kind of hard to read. So, to record keyboard events, I like to use the keyboard module and the threading module simultaneously, like this:
import keyboard import string from threading import * # I can't find a complete list of keyboard keys, so this will have to do: keys = list(string.ascii_lowercase) """ Optional code(extra keys): keys.append("space_bar") keys.append("backspace") keys.append("shift") keys.append("esc") """ def listen(key): while True: keyboard.wait(key) print("[+] Pressed",key) threads = [Thread(target=listen, kwargs={"key":key}) for key in keys] for thread in threads: thread.start()