banging my head on Streamlit

app.py

@@ -24,40 +24,42 @@ while True:
             st.write(msg)
 
         st.session_state['messages'].append("Tick.")
-        line = child.readline()
-        st.session_state['messages'].append(line)
-        if ">>>>>" in line:
+        line = None
+        try :
+            line = child.read_nonblocking(size=1000, timeout=0)
+        except:
+            pass
+        if line is not None: st.session_state['messages'].append(line)
+        
+        if ">>>>>" in st.session_state['messages'][-1]:
             user_input = st.text_input("Enter your message here:")
-            if user_input : child.sendline(user_input)
-
-
-
-
-"""
-last_line = child.readline()
-
-st.session_state['messages'].append(last_line)
-
-# Display the list of messages
-for msg in st.session_state['messages']:
-    st.write(msg)
-
-if ">>>>>" in last_line:
-    # Create a text input field for users to enter their messages
-    user_input = st.text_input("Enter your message here:")
-
-    # Add user's message to the list when the submit button is clicked
-    if user_input:
-        st.session_state['messages'].append(user_input)
-        child.sendline(user_input)
+            if user_input :
+                st.session_state['messages'].append(user_input)
+                child.sendline(user_input)
+
+
+
+
+#
+# last_line = child.readline()
+#
+# st.session_state['messages'].append(last_line)
+#
+# # Display the list of messages
+# for msg in st.session_state['messages']:
+#     st.write(msg)
+#
+# if ">>>>>" in last_line:
+#     # Create a text input field for users to enter their messages
+#     user_input = st.text_input("Enter your message here:")
+#
+#     # Add user's message to the list when the submit button is clicked
+#     if user_input:
+#         st.session_state['messages'].append(user_input)
+#         child.sendline(user_input)
 
 """
 
-
-
-
-
-"""
 import pexpect
 import time
 
@@ -66,9 +68,11 @@ child = pexpect.spawn("python DO_NOT_COMMIT.py", encoding='utf-8', timeout=None)
 
 while True:
     time.sleep(1)
-    print("Tick.")
-    line = child.readline()
-    print(line)
-    if ">>>>>" in line: child.sendline(input(">>>>>"))
-
-    """
+    line = None
+    try :
+        line = child.read_nonblocking(size=1000, timeout=0)
+    except:
+        pass
+    if line is not None: print(repr(line))
+    #if ">>>>>" in line: child.sendline(input(">>>>>"))
+"""