from pynput import keyboard
from pynput.keyboard import Controller, Key
import time, threading

shift = False
keycon = Controller()

def set_interval(func, sec):
   def func_wrapper():
      set_interval(func, sec)
      func()
   t = threading.Timer(sec, func_wrapper)
   t.start()
   return t

def on_press(key):
   global shift
   if str(key) == "Key.shift": shift = True


def on_release(key):
   global shift
   if str(key) == "Key.shift": shift = False


def check_shift():
   if shift:
      print("Doing action")
      keycon.press("w")
      keycon.release("w")
   else:
      print("Not doing action")

a = set_interval(check_shift, 0.01)

# Collect events until released
with keyboard.Listener(
        on_press=on_press,
        on_release=on_release) as listener:
    listener.join()