Update pages/gen_ai.py

pages/gen_ai.py

@@ -1,21 +1,22 @@
 import streamlit as st
 import os
 from langchain_huggingface import HuggingFaceEndpoint, ChatHuggingFace
-from langchain_core.messages import HumanMessage, AIMessage, SystemMessage
+from langchain_core.messages import HumanMessage, SystemMessage
 
 # Set Hugging Face tokens
 hf = os.getenv('Data_science')
 os.environ['HUGGINGFACEHUB_API_TOKEN'] = hf
 os.environ['HF_TOKEN'] = hf
 
-# --- Config ---
+# --- Page Configuration ---
 st.set_page_config(page_title="GenAI Mentor Chat", layout="centered")
 st.title("🤖 GenAI Mentor Chat")
 
-# --- Sidebar for selections ---
+# --- Sidebar: Experience Level ---
 st.sidebar.title("Mentor Preferences")
-exp_options = ['Beginner', 'Intermediate', 'Experienced']
-exp = st.sidebar.selectbox("Select your experience level:", exp_options)
+experience_label = st.sidebar.selectbox(
+    "Select your experience level:", ["Beginner", "Intermediate", "Experienced"]
+)
 
 # --- Initialize Chat Model ---
 genai_skeleton = HuggingFaceEndpoint(
@@ -35,36 +36,31 @@ genai_chat = ChatHuggingFace(
     task='conversational'
 )
 
-# --- Session State ---
-if "chat_history_genai" not in st.session_state:
-    st.session_state.chat_history_genai = []
+PAGE_KEY = "genai_chat_history"
+
+# --- Session State Initialization ---
+if PAGE_KEY not in st.session_state:
+    st.session_state[PAGE_KEY] = []
 
-# --- Chat Form ---
+# --- Chat Input Form ---
 with st.form(key="chat_form"):
     user_input = st.text_input("Ask your question:")
     submit = st.form_submit_button("Send")
 
 # --- Chat Logic ---
 if submit and user_input:
-    # Add system context
     system_prompt = (
-        f"You are a Generative AI mentor with {exp.lower()} experience level. "
-        f"Answer questions only related to Generative AI in a friendly tone and under 150 words. "
-        f"If the question is not related to Generative AI, politely inform the user that it's out of scope."
+        f"You are a Generative AI mentor with {experience_label.lower()} experience. "
+        f"Answer only Generative AI questions in a friendly tone, within 150 words. "
+        f"Politely inform if the question is out of scope."
     )
-
-    # Create message list
     messages = [SystemMessage(content=system_prompt), HumanMessage(content=user_input)]
-
-    # Get model response
     result = genai_chat.invoke(messages)
+    st.session_state[PAGE_KEY].append((user_input, result.content))
 
-    # Append to history
-    st.session_state.chat_history_genai.append((user_input, result.content))
-
-# --- Display Chat History ---
+# --- Chat History Display ---
 st.subheader("🗨️ Chat History")
-for user, bot in st.session_state.chat_history_genai:
+for user, bot in st.session_state[PAGE_KEY]:
     st.markdown(f"**You:** {user}")
     st.markdown(f"**Mentor:** {bot}")
     st.markdown("---")