{history}
Human: {human_input}
Assistant:"""
prompt = PromptTemplate(
    input_variables=["history", "human_input"], 
    template=template
)
chatgpt_chain = LLMChain(
    llm=OpenAI(temperature=0), 
    prompt=prompt, 
    verbose=True, 
    memory=ConversationBufferWindowMemory(k=2),
)
import speech_recognition as sr
import pyttsx3
engine = pyttsx3.init()
def listen():
    r = sr.Recognizer()
    with sr.Microphone() as source:
        print('Calibrating...')
        r.adjust_for_ambient_noise(source, duration=5)
        # optional parameters to adjust microphone sensitivity
        # r.energy_threshold = 200
        # r.pause_threshold=0.5    
        
        print('Okay, go!')
        while(1):
            text = ''
            print('listening now...')
            try:
                audio = r.listen(source, timeout=5, phrase_time_limit=30)
                print('Recognizing...')
                # whisper model options are found here: https://github.com/openai/whisper#available-models-and-languages
                # other speech recognition models are also available.
                text = r.recognize_whisper(audio, model='medium.en', show_dict=True, )['text']
            except Exception as e:
                unrecognized_speech_text = f'Sorry, I didn\'t catch that. Exception was: {e}s'
                text = unrecognized_speech_text
            print(text)
            
            response_text = chatgpt_chain.predict(human_input=text)
            print(response_text)
            engine.say(response_text)
            engine.runAndWait()
listen(None)
Calibrating...
rtdocs_stable/api.python.langchain.com/en/stable/use_cases/chatbots/voice_assistant.html