Press key "J" every 1 second..

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

from time import sleep
from pyautogui import press

class KeyPresser:
    def __init__(self, key='j', interval=1):
        self.key = key
        self.interval = interval

    def press_key(self):
        press(self.key)

    def run(self):
        while True:
            self.press_key()
            sleep(self.interval)

if __name__ == "__main__":
    key_presser = KeyPresser()
    key_presser.run()