app.py

import streamlit as st
import pandas as pd

#Globals
legal_numbers = [1,2,3,4,5,6,7,8,9]
col1, col2, col3 = st.columns(3)
col4, col5, col6 = st.columns(3)
col7, col8, col9 = st.columns(3)

def get_userInput(): 
    input = st.text_input("Enter a number between 1 to 9: ", key="input")
    st.text("Legal Numbers: " + "".join(str(legal_numbers)))
    return input

def validate_userInput(user_input):
    if user_input.isdigit():
        return True
    else:
        return "Please enter a digit between 1 to 9."

def display_board():   
    with col1:
        st.text("X")
    with col2:
       st.text("O")
    with col3:
       st.text("...")
    with col4:
        st.text(" X ")
    with col5:
       st.text(" O ")
    with col6:
       st.text(" ... ")
    with col7:
        st.text(" X ")
    with col8:
       st.text(" O ")
    with col9:
       st.text(" ... ")

def reset_legalNumbers():
    legal_numbers = [1,2,3,4,5,6,7,8,9]
    
#def update_legalNumbers():  
    
    
#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()
display_board()

#UI Buttons
submit=st.button('Submit')
replay=st.button('Replay')

#After User Interaction
response=validate_userInput(user_input)

#Button functionality
if submit:
    st.subheader("")
    st.write(response)

if replay:
    display_board()