how to detect keypress in python

1# in command prompt, type "pip install pynput" to install pynput.
2from pynput.keyboard import Key, Controller
3
4keyboard = Controller()
5key = "a"
6
7keyboard.press(key)
8keyboard.release(key)

1import keyboard  # using module keyboard
2while True:  # making a loop
3    try:  # used try so that if user pressed other than the given key error will not be shown
4        if keyboard.is_pressed('q'):  # if key 'q' is pressed 
5            print('You Pressed A Key!')
6            break  # finishing the loop
7    except:
8        break  # if user pressed a key other than the given key the loop will break

1# in console: pip install keyboard
2import time
3import keyboard as kb
4
5key = "a"
6
7while (True):
8	if (kb.is_pressed(key)):
9		print("a pressed")
10	
11    time.sleep(0.001) # decreases CPU usage

1# pip3 install pynput
2
3from pynput.keyboard import Key, Listener
4
5
6def show(key):
7
8    pressed_key = str(key).replace("'", "")
9    print(" key: ", pressed_key)
10
11    if key == Key.esc:
12        # Stop listener
13        return False
14
15
16# Listener
17with Listener(on_press=show) as listener:
18    listener.join()
19

1var input = document.getElementById('myInput');
2input.onkeydown = function() {
3    var key = event.keyCode || event.charCode;
4    if( key == 8 ){
5    	//backspace pressed
6    }
7};