Update app.py

app.py

@@ -75,6 +75,8 @@ if 'df' not in st.session_state:
     st.session_state.df = None  
 if 'authenticated' not in st.session_state:  
     st.session_state.authenticated = False  
+if 'login_attempt' not in st.session_state:  
+    st.session_state.login_attempt = False  
   
 # List of valid usernames and passwords  
 user_credentials = {  
@@ -93,12 +95,17 @@ if not st.session_state.authenticated:
     st.title("Login")  
     username = st.text_input("Username")  
     password = st.text_input("Password", type="password")  
-    if st.button("Login"):  
+    login_button = st.button("Login")  
+    if login_button:  
         if authenticate(username, password):  
             st.session_state.authenticated = True  
-            st.experimental_rerun()  # This will rerun the script  
+            st.session_state.login_attempt = False  # Reset the login attempt flag  
         else:  
+            st.session_state.login_attempt = True  
             st.error("Invalid username or password")  
+  
+    if st.session_state.login_attempt:  
+        st.warning("Please try again.")  
 else:  
     st.write("User authenticated successfully")  
     st.image(MAIN_LOGO_URL, use_column_width=True)  
@@ -133,7 +140,7 @@ else:
             if st.button("Delete Selected File"):  
                 os.remove(os.path.join(UPLOAD_DIR, selected_file))  
                 st.success(f"File '{selected_file}' deleted successfully.")  
-                st.experimental_rerun()  # This will rerun the script  
+                st.session_state.df = None  # Reset the dataframe in session state  
   
             if st.button("Load Selected File") or st.session_state.df is None:  
                 try: