Caching reverts widgets to initial state

Summary

After an interactive widget is used, the value of the user input is reverted back to the default value the next time the page updates (when the script is re-run).

Steps to reproduce

What are the steps we should take to reproduce the bug:

1. Start with a new streamlit run! The problem usually goes away after the first try
2. Click the “select” checkbox
3. Click the “test” checkbox at the bottom of the page

import seaborn as sns
import streamlit as st

@st.cache(suppress_st_warning=True) # caching is required
def updt_data():
    st.balloons() # streamlit function is required
    return None

updt_data()

select = st.checkbox("Select")

# any type of plot widget or specific seaborn functions such as get_dataset_names() or
# load_dataset() is required here
sns.get_dataset_names()

st.write("Selected?", select)
st.checkbox("Test")

Expected behavior:

The value of ‘Select’ remains True because the “select” checkbox is checked.

Actual behavior:

The value of ‘Select’ changes to False even though the “select” checkbox is checked.

Is this a regression?

No

Debug info

• Streamlit version: 0.66
• Python version: 3.8
• PipEnv version: 20.2
• OS version: MacOS Catalina
• Browser version: Chrome 85

Additional information

May be related to one of the following issues: https://github.com/streamlit/streamlit/issues/1532 https://github.com/streamlit/streamlit/issues/1259

[MartinNowak]

Indeed seems to fixed in newer versions.

[akrolsmir]

Can also confirm this repros! Thanks for the detailed repro case with explanations of which lines are necessary =)