app.py

import streamlit as st

def get_userInput(): #from the UI App
    input = st.text_input("Enter a number: ", key="input")
    return input

def validate_userInput(user_input):
    if user_input.isdigit():
        return True
    else:
        return False
    
#UIApp starts here
st.set_page_config(page_title="Python - Tic Tac Toe", page_icon=":python:")
st.header("Python - Tic Tac Toe")

user_input=get_userInput()
response=validate_userInput(user_input)

submit=st.button('Submit')
if submit:
    st.subheader("")
    st.write(response)