Create new file

abc.py

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+import streamlit as st
+
+
+session_state = st.sessionstate.get(col1=False, col2=False, col3=False)
+
+col1, col2, col3 = st.columns(3)
+
+col1_one = col1.button("CARTE", key="1")
+col2_one = col2.button("TABLEAU", key="2")
+col3_one = col3.button("SYNTHÈSE", key="3")
+
+if col1_one or session_state.col1:
+    session_state.col1 = True
+    session_state.col2 = False
+    session_state.col3 = False
+    sel_Map = st.selectbox("Choose Map type :", options=['Hello1', 'Hello2'], index=1)
+    if sel_Map == 'Hello1':
+        st.write("Hello world! 1")
+    elif sel_Map == 'Hello2':
+        st.write("Hello world! 2")
+
+if col2_one or session_state.col2:
+    session_state.col1 = False
+    session_state.col2 = True
+    session_state.col3 = False
+    st.write("Hello world! 3")
+
+if col3_one or session_state.col3:
+    session_state.col1 = False
+    session_state.col2 = False
+    session_state.col3 = True
+    st.write("Hello world! 4")