Using asyncio in Streamlit

asyncio-test.py

import asyncio
import streamlit as st
from datetime import datetime

st.set_page_config(layout="wide")

st.markdown(
    """
    <style>
    .time {
        font-size: 100px !important;
        font-weight: 700 !important;
        color: #ec5953 !important;
    }
    </style>
    """,
    unsafe_allow_html=True
)

async def watch(t: st._DeltaGenerator):
    while True:
        t.markdown(
            f"""
            <p class="time">
                {str(datetime.now())}
            </p>
            """, unsafe_allow_html=True)
        if await asyncio.sleep(1) == None: # <-- prevents printout of "None"
            pass
        st.experimental_rerun()  # <-- rerun here

test = st.empty()

asyncio.run(watch(test))