Update app.py

app.py

@@ -46,7 +46,7 @@ tab1, tab2, tab3 = st.tabs(["📈 Load Data", "📃 Tagged ETDs", "📓 Download
 with tab1:
 #===load data===
 
-if uploaded_file is not None:
+    if uploaded_file is not None:
     df = pd.read_csv(uploaded_file, encoding='latin-1')
     st.dataframe(df)
     
@@ -54,7 +54,7 @@ with tab2:
 #===tagged ETDs===
 # Tag the "Abstract" column with the corresponding categories
 
-if uploaded_file is not None:
+    if uploaded_file is not None:
     df = pd.read_csv(uploaded_file, encoding='latin-1')
     st.dataframe(df)
     df['category'] = df['Abstract'].apply(predict_category)
@@ -72,7 +72,7 @@ with tab3:
 #===download result===
 # Create a download button
 
-if st.sidebar.button("Download"):
+    if st.sidebar.button("Download"):
     csv = df.to_csv(index=False)
     b64 = base64.b64encode(csv.encode()).decode()
     href = f'<a href="data:file/csv;base64,{b64}" download="results.csv">Download csv file</a>'