import tkinter as tk

# --- functions ---

def on_press(event):
    # display pressed key
    #print(event)
    print('PRESS   | keycode: {}, keysym: {}, char: {}'.format(event.keycode, event.keysym, event.char))

def on_release(event):
    # display released key
    #print(event)
    print('RELEASE | keycode: {}, keysym: {}, char: {}'.format(event.keycode, event.keysym, event.char))

    # exit program on ESC
    #if event.keysym == 'Escape':
    #     root.destroy()

# --- main ---

root = tk.Tk()

# assign functions to events
root.bind('<KeyPress>', on_press)
root.bind('<KeyRelease>', on_release)

root.mainloop()

PRESS   | keycode: 38, keysym: a, char: a
RELEASE | keycode: 38, keysym: a, char: 
PRESS   | keycode: 54, keysym: c, char: c
RELEASE | keycode: 54, keysym: c, char: 
PRESS   | keycode: 12, keysym: 3, char: 3
RELEASE | keycode: 12, keysym: 3, char: 
PRESS   | keycode: 50, keysym: Shift_L, char: 
PRESS   | keycode: 13, keysym: dollar, char: $
RELEASE | keycode: 13, keysym: dollar, char: 
RELEASE | keycode: 50, keysym: Shift_L, char: 
PRESS   | keycode: 50, keysym: Shift_L, char: 
PRESS   | keycode: 10, keysym: exclam, char: !
RELEASE | keycode: 10, keysym: exclam, char: 
RELEASE | keycode: 50, keysym: Shift_L, char: 

import pygame

# init pygame and create window which will be get events from system
pygame.init()
screen = pygame.display.set_mode((800,600))

running = True
while running:

    for event in pygame.event.get():
        # close window with button [X]
        if event.type == pygame.QUIT:
            running = False

        elif event.type == pygame.KEYDOWN:
            # display pressed key
            #print(event)
            print('PRESS   | scancode: {}, key: {}, unicode: {}'.format(event.scancode, event.key, event.unicode))

        elif event.type == pygame.KEYUP:
            # display released key
            #print(event)
            print('RELEASE | scancode: {}, key: {}'.format(event.scancode, event.key)) # `KEYUP` doesn't have `event.unicode`

            # exit on ESC 
            #if event.key == pygame.K_ESCAPE:
            #   running = False

# exit
pygame.quit()

PRESS   | scancode: 38, key: 97, unicode: a
RELEASE | scancode: 38, key: 97
PRESS   | scancode: 54, key: 99, unicode: c
RELEASE | scancode: 54, key: 99
PRESS   | scancode: 50, key: 304, unicode: 
PRESS   | scancode: 13, key: 52, unicode: $
RELEASE | scancode: 13, key: 52
RELEASE | scancode: 50, key: 304
PRESS   | scancode: 50, key: 304, unicode: 
PRESS   | scancode: 10, key: 49, unicode: !
RELEASE | scancode: 10, key: 49
RELEASE | scancode: 50, key: 304