Create app.py

app.py

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+import os
+from dotenv import load_dotenv
+import gradio as gr
+from langchain_openai import ChatOpenAI
+from langchain.prompts import (
+    ChatPromptTemplate,
+    MessagesPlaceholder,
+    SystemMessagePromptTemplate,
+    HumanMessagePromptTemplate,
+)
+from langchain_core.output_parsers import StrOutputParser
+from langchain.chains import LLMChain
+from langchain.memory import ConversationBufferMemory
+
+# Load environment variables
+load_dotenv()
+OPENAI_SECRET_KEY = os.getenv("OPENAI_API_KEY")
+
+def initialize_chatbot():
+    """Initialize the chatbot components."""
+    if not OPENAI_SECRET_KEY:
+        raise ValueError("OpenAI API Key not found in environment variables.")
+    
+    # Initialize the chatbot components
+    llm = ChatOpenAI(api_key=OPENAI_SECRET_KEY)
+    prompt = ChatPromptTemplate(
+        messages=[
+            SystemMessagePromptTemplate.from_template(
+                "You are a nice chatbot having a conversation with a human."
+            ),
+            MessagesPlaceholder(variable_name="chat_history"),
+            HumanMessagePromptTemplate.from_template("{question}")
+        ]
+    )
+    memory = ConversationBufferMemory(memory_key="chat_history", return_messages=True)
+    conversation = LLMChain(
+        llm=llm,
+        prompt=prompt,
+        verbose=True,
+        memory=memory
+    )
+    
+    output_parser = StrOutputParser()
+    chain = conversation
+    return chain
+
+# Initialize the chatbot outside of the function to make it accessible
+chain = initialize_chatbot()
+
+def chat_response(message, history):
+    """Generate response for the given message."""
+    response = chain.invoke({"question": message})
+    return response
+
+if __name__ == "__main__":
+    # Launch the chat interface
+    gr.ChatInterface(
+        chat_response,
+        chatbot=gr.Chatbot(height=500),
+        textbox=gr.Textbox(placeholder="", container=False, scale=7),
+        title="ChatBot",
+        description="Ask any question",
+        theme="soft",
+        examples=["Hello", "Am I cool?", "What is GenAI?"],
+        cache_examples=True,
+        retry_btn=None,
+        undo_btn="Delete Previous",
+        clear_btn="Clear",
+    ).launch()