streamlit_example.py

import streamlit as st

# initialize the "count"-variable to session state
if "count" not in st.session_state:
    st.session_state["count"] = 0

# clicked will be True when the button was clicked
# and False otherwise (for example if another action
# was performed or if it has not been clicked yet)
clicked = st.button("Click here!")
# Adding true is the same as adding 1
# Adding False is the same as adding 0
st.session_state["count"] += clicked
# Show the count
st.text(f"Count is {st.session_state['count']}")