Infinite While True Loop in the Background (Python)

Try multithreading.

import threading

def background():
    while True:
        number = int(len(oilrigs)) * 49
        number += money
        time.sleep(1)

def foreground():
    # What you want to run in the foreground

b = threading.Thread(name='background', target=background)
f = threading.Thread(name='foreground', target=foreground)

b.start()
f.start()