Update app.py

app.py

@@ -37,11 +37,11 @@ def validate_email(email):
 
 def login():
     st.write("Login")
-    username = st.text_input("Email")
-    if validate_email(username):
-        st.success("The email address is valid.")
-    else:
-        st.error("The email address is not valid.")
+    if username := st.text_input("Email")
+        if validate_email(username):
+            st.success("The email address is valid.")
+        else:
+            st.error("The email address is not valid.")
     password = st.text_input("Password", type="password")
     if st.button("Login"):
         if username in col.find():