Pass values from one widget to another in a form

🎈 Using Streamlit
2

Hi @Nitya_Bhat

Please copy-paste this code into a file and test it before suitably modifying it for your use. Hopefully, this is what you are looking for.

import streamlit as st
import pandas as pd

data = [['Arizona', 'Phoenix'], ['Arizona', 'Tucson'], ['Arizona', 'Glendale'], 
        ['Montana', 'Billings'], ['Montana', 'Butte'],
        ['Wyoming', 'Cheyenne'],['Wyoming', 'Casper'], ['Wyoming', 'Gillette']]

df = pd.DataFrame(data, columns=['State', 'City'])
st.dataframe(df)

mystates = st.multiselect("States ?", df['State'].unique())
if len(mystates) > 0:
    mycities = df.get(['City']).where(df.get("State").isin(mystates)).dropna()
    mycities = st.multiselect("Cities ?", mycities)

Cheers