Need help creating a simple script

[Nonameface]

This is what i got:

Traceback (most recent call last):
File "C:\Users\SystemAdmin\Desktop\testpy.py", line 13, in <module>
sleep(30)
NameError: name 'sleep' is not defined


This is what i put down:import webbrowser


chrome_path = 'C:/Program Files (x86)/Google/Chrome/Application/chrome.exe %s'

webbrowser.get(chrome_path).open('https://www.halowaypoint.com/en-us/news')


import time


sleep(30)

os.system("taskkill /im chrome.exe /f")

But then i want it to open again, after that time is up.

Im using way point for more of a message grabber. I actually plan on dedicating most of my time on learning all languages. I'm just starting, and this stuff fascinates me. Thanks for the help :D