St.memization_memo ttl question

Using Streamlit
#1

Hi all,

Just a simple question - the ttl option on the st.memoization_memo decorator - after the number of seconds you define in that, does the cache automatically refresh? I have a function which calls a request which updates on its home website after a day, and I wish to have a function that automatically calls a new version of that request after X seconds, and so I’ve listed it in the ttl option.

Just wondering if that was how it worked, or whether my understanding is incorrect?

Thank you for your great work

Sang

#2

The ttl means that if you call the function after that many seconds has passed, then the function will be re-run. Otherwise, it will simply return the previously-returned value. It won’t automatically rerun the function after that many seconds have passed. If you have something that needs to be re-run continually, here’s one way you can accomplish that:

from datetime import datetime
from time import sleep

import streamlit as st


@st.experimental_memo(ttl=3)
def get_time():
    return datetime.now()

time_goes_here = st.empty()

while True:
    # Should update every 3 seconds
    time_goes_here.write(f"# Current time {get_time()}")
    sleep(1)
1 Like
#3

Hi Blackary,

Thank you for the reply. I’ll give this method a try.