I haven't looked a Jupyter at all; in plain Python, I'd start with something like this[1]:

  schedule = set() # (time, function) pairs
  while True:
    next=min(schedule)
    schedule.remove(next)
    sleep(next[0] - now())
    next[1]()
    schedule.add((now() + interval, next[1]))
    

[1] Pseudocode only; I don't have the API reference in front of me to verify method names and such. Several edge cases are unhandled.