Realtime data update to streamlit from python variable

Question

New to python world. I am trying to understand how to update realtime data in streamlit app.(Reference Blog).

I am looping through the numbers 1 to 100, display the number along with number * 10. But streamlit always shows number as 1. How can I update the numbers(realtime update) in streamlit?

My code:

import threading
import streamlit as st
import time

global val, multiply


def test_run():
    global val, multiply
    for x in range(1, 100):
        val = x
        multiply = val * 10
        print(val)
        time.sleep(1)
    return val, multiply


threading.Thread(target=test_run).start()

# dashboard title
st.title("Stramlit Learning")

# creating a single-element container.
placeholder = st.empty()

with placeholder.container():
    col1, col2 = st.columns(2)
    col1.metric(label="Current Value", value=val)
    col2.metric(label="Multiply by 10 ", value=multiply)

Asked By: acr

||

Source

Answer 1

Here is a fixed version of your code: Values of the variables will get updated in every second.

import threading
import streamlit as st
import time
import queue


q = queue.Queue()

def test_run():
    for x in range(1, 100):
        val = x
        multiply = val * 10
        q.put((val, multiply))
        print(val)
        time.sleep(1)


def update_dashboard():
    while True:
        val, multiply = q.get()

        col1, col2 = st.columns(2)
        col1.metric(label="Current Value", value=val)
        col2.metric(label="Multiply by 10 ", value=multiply)


threading.Thread(target=test_run).start()

# dashboard title
st.title("Streamlit Learning")

with st.empty():
    update_dashboard()

Answered By: Jamiu Shaibu

Realtime data update to streamlit from python variable

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