ODP KS code checker

from pynput.keyboard import Key, Controller
import keyboard
from time import sleep
import pickle

control = Controller()
def press(k):
    control.press(k)
    control.release(k)
    return k

def convert(n):
    out = str(n)
    while len(out) < 6:
        out = "0"+out
    return out

with open("last_number.txt", "rb") as file_handler:
    nr = pickle.load(file_handler)
run = False
while True:
    while nr < 1000000 and run:
        text = ""
        code = convert(nr)
        text += press("p")
        if keyboard.is_pressed("space"): ### toggle code checking off
            run = False
            sleep(0.5)
        for x in code:
            text += press(x)
        text += press("m")
        print(text)
        sleep(0.01) #seconds/code tests
        nr += 1
    if keyboard.is_pressed("space"): #toggle code checking on
            run = True
            sleep(0.5)
    if keyboard.is_pressed("esc"):   #quit
        break

if nr >= 1000000:
    with open("last_number.txt", "wb") as file_handler:
        pickle.dump((0),(file_handler))
else:
    with open("last_number.txt", "wb") as file_handler:
        pickle.dump((nr),(file_handler))
print(f"saved {nr} to last_number.txt")