Experimental_allow_widgets breaks caching for multipage apps

Using Streamlit
1

Summary

Cache gets lost on switching pages with experimental_allow_widgets.

Steps to reproduce

page1.py

import streamlit as st
import time


@st.cache_data(experimental_allow_widgets=True)
def calculate():
    time.sleep(1)
    if st.sidebar.checkbox("Are you awesome 1?"):
        st.write("Hello awesome page 1")
    else:
        st.write("Hello page 1")


st.write("I am page 1")
calculate()

page2.py

import streamlit as st
import time


@st.cache_data(experimental_allow_widgets=True)
def calculate():
    time.sleep(1)
    if st.sidebar.checkbox("Are you awesome 2?"):
        st.write("Hello awesome page 2")
    else:
        st.write("Hello page 2")


st.write("I am page 2")
calculate()

pageA.py

import streamlit as st
import time


@st.cache_data()
def calculate(checked):
    time.sleep(1)
    if checked:
        st.write("Hello awesome page A")
    else:
        st.write("Hello page A")


st.write("I'am page A")
checked = st.sidebar.checkbox("Are you awesome A?")
calculate(checked)

pageB.py

import streamlit as st
import time


@st.cache_data()
def calculate(checked):
    time.sleep(1)
    if checked:
        st.write("Hello awesome Page B")
    else:
        st.write("Hello Page B")


st.write("I'am Page B")
checked = st.sidebar.checkbox("Are you awesome B?")
calculate(checked)

Steps to reproduce:
Switch between page1 and page2 multiple times. Observe Caching.
Switch between pageA and pageB multiple times. Observe Caching.

Expected behavior:

page1 and page2 use caching.
(page1 and page2 should behave as pageA and PageB)

Actual behavior:

Caching on page1 and page2 does not work. Even without using the Widget.
Caching on pageA and pageB does work as expected.

Debug info

  • Streamlit version: 1.22.0
  • Python version: 3.10.8
  • Using Conda

Additional Info

Caching does work if you stay on that page.
(page1 and page 2 do cache the button state as long as you don’t switch to an other page.)

2

Adding a key to the widget didn’t help either.

3

Hi @streamlituser3

Thanks for sharing the question and implementations. This seems to be a recurring issue that the Streamlit team is looking into. If you’d like to join in on the discussion (there are a few workarounds that you may find helpful), you can find it in the link below:

Hope this helps!

Best regards,
Chanin

4

Do you mean that the current implementation of “Keyed widget state persistence” is the direct cause of “Experimental_allow_widgets breaking caching for multipage apps”?

5

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