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app.py

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+from langchain_core.prompts import ChatPromptTemplate
+from langchain_core.output_parsers import StrOutputParser
+from langchain_community.llms import Ollama
+import streamlit as st
+import os
+from dotenv import load_dotenv
+
+load_dotenv()
+
+os.environ["LANGCHAIN_TRACING_V2"]="true"
+os.environ["LANGCHAIN_API_KEY"]=os.getenv("LANGCHAIN_API_KEY")
+
+## Prompt Template
+
+prompt=ChatPromptTemplate.from_messages(
+    [
+        ("system","You are a helpful assistant. Please response to the user queries"),
+        ("user","Question:{question}")
+    ]
+)
+## streamlit framework
+
+st.title('Langchain chatbot app With LLAMA2 API')
+input_text=st.text_input("Search the topic u want")
+
+# ollama LLAma2 LLm 
+llm=Ollama(model="llama2")
+output_parser=StrOutputParser()
+chain=prompt|llm|output_parser
+
+if input_text:
+    st.write(chain.invoke({"question":input_text}))

requirements.txt

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+langchain
+langchain_community
+streamlit
+python-dotenv