Update app.py

app.py

@@ -12,6 +12,8 @@ from st_aggrid import AgGrid, GridOptionsBuilder, JsCode,GridUpdateMode
 import base64
 showWarningOnDirectExecution = False
 
+def convert_df(df):
+   return df.to_csv(index=False).encode('utf-8')
 
     
 # Check if 'key' already exists in session_state
@@ -81,11 +83,8 @@ with st.form('mform', clear_on_submit=False):
                 selected_df = pd.DataFrame()
                 pass
         st.success('Feature vector successfully created.')
+        csv = convert_df(selected_df)
 
-def convert_df(df):
-   return df.to_csv(index=False).encode('utf-8')
-
+        st.download_button("Press to Download the Feature Vector", csv,"ASCARIS_SAV_rep.csv","text/csv",key='download-csv')
 
-csv = convert_df(selected_df)
 
-st.download_button("Press to Download the Feature Vector", csv,"ASCARIS_SAV_rep.csv","text/csv",key='download-csv')