banging my head on Streamlit

app.py

@@ -15,6 +15,7 @@ child = st.session_state['child']
 # creating a single-element container
 placeholder = st.empty()
 
+user_input = st.empty()
 user_input = st.text_input("Enter your message here:")
 
 while True:
@@ -31,10 +32,9 @@ while True:
         if line is not None: st.session_state['messages'].append(line)
 
         if user_input :
-            st.session_state['messages'].append(str(user_input))
             child.sendline(str(user_input))
             user_input=""
-    time.sleep(5)
+    time.sleep(0.5)