code: import os
  import streamlit as st
  import langchain.memory
  import langchain.llms
  import langchain.chains
  from apikey import apikey
  from langchain.memory import ConversationBufferMemory
  from langchain.memory import ChatMessageHistory
  from langchain.llms import OpenAI
  from langchain.chains import ConversationChain
  from langchain.memory import ConversationBufferMemory
  
  os.environ["OPENAI_API_KEY"] =apikey 
  
  def conversation_memory():
      history = ChatMessageHistory()
      history.add_user_message("hi!")
      history.add_ai_message("whats up?")
  
      memory = ConversationBufferMemory(chat_memory=history)
  
      llm = OpenAI(temperature=0)
      conversation = ConversationChain(llm=llm, memory=memory, verbose=True)
  
      def predict(user_input):
          response = conversation.predict(input=user_input)
          return response
  
      st.title("Conversation Memory Chatbot")
  
      user_input = st.text_input("Enter your message:")
  
      if user_input:
          response = predict(user_input)
          st.write("AI response:", response)
  
  
  if __name__ == "__main__":
      conversation_memory()  
  
apis: langchain.memory.ConversationBufferMemory langchain.memory.ChatMessageHistory langchain.llms.OpenAI langchain.chains.ConversationChain
extract_api: [((447, 467), 'langchain.memory.ChatMessageHistory', 'ChatMessageHistory', ([], {}), '()\n', (465, 467), False, 'from langchain.memory import ChatMessageHistory\n'), ((558, 603), 'langchain.memory.ConversationBufferMemory', 'ConversationBufferMemory', ([], {'chat_memory': 'history'}), '(chat_memory=history)\n', (582, 603), False, 'from langchain.memory import ConversationBufferMemory\n'), ((615, 636), 'langchain.llms.OpenAI', 'OpenAI', ([], {'temperature': '(0)'}), '(temperature=0)\n', (621, 636), False, 'from langchain.llms import OpenAI\n'), ((656, 711), 'langchain.chains.ConversationChain', 'ConversationChain', ([], {'llm': 'llm', 'memory': 'memory', 'verbose': '(True)'}), '(llm=llm, memory=memory, verbose=True)\n', (673, 711), False, 'from langchain.chains import ConversationChain\n'), ((829, 868), 'streamlit.title', 'st.title', (['"""Conversation Memory Chatbot"""'], {}), "('Conversation Memory Chatbot')\n", (837, 868), True, 'import streamlit as st\n'), ((887, 923), 'streamlit.text_input', 'st.text_input', (['"""Enter your message:"""'], {}), "('Enter your message:')\n", (900, 923), True, 'import streamlit as st\n'), ((991, 1025), 'streamlit.write', 'st.write', (['"""AI response:"""', 'response'], {}), "('AI response:', response)\n", (999, 1025), True, 'import streamlit as st\n')]