I use this gist when need to maintain the connection on google codelab for a long time. Is necessary to install the library pynput(https://pypi.org/project/pynput/) and run in Python.

fake_keyboard.py

# -*- coding: utf-8 -*-
"""
Spyder Editor

Maintain the connection on google codelab google for a long time. write in google cell at random time between 1 and 100 seconds.
"""
from pynput.keyboard import Key, Controller
import time
import random

keyboard = Controller()

with keyboard.pressed(Key.alt):
    keyboard.press(Key.tab)
    keyboard.release(Key.tab)
  
while True:
    i = random.randint(1,100) 
    print(i) 
    
    keyboard.type(str(i))
    time.sleep(i)  
   
    with keyboard.pressed(Key.ctrl):
        keyboard.press('a')
        keyboard.release('a')