Update app.py

app.py

@@ -104,16 +104,17 @@ if upload_file is not None:
                 value_column = st.selectbox("Select the value column:", all_columns)
                 
                 if parent_column and value_column:
+                    if parent_column == value_column:
+                        st.warning("Warning: You have selected the same column for both the parent and value. This might not produce a meaningful treemap.")
+                elif parent_column and value_column:
                     path_columns = [px.Constant("all"), parent_column, value_column]
-                    
                     fig = px.treemap(df,
-                             path=path_columns)
-                             
+                         path=path_columns)
+
                     fig.update_layout(margin=dict(t=50, l=25, r=25, b=25))
                     st.subheader("Tree map", divider="red")
                     st.plotly_chart(fig)
-                
-                
+                    
                     st.write("_number of rows_", df.shape[0])
                     st.write("_number of columns_", df.shape[1])
                     st.session_state.df = df