As seen here https://mlis.fun/how-to-build-a-chatbot-in-15-minutes-or-less/

politics_chatbot.py

import sys, boto3

aws_access_key_id=sys.argv[1]
aws_secret_access_key=sys.argv[2]

lex = boto3.client('lex-runtime', region_name="us-east-1", aws_access_key_id=aws_access_key_id, aws_secret_access_key=aws_secret_access_key)

while True:
    var = input("")

    lex_response = lex.post_text(botName='politics', botAlias='politicsbot', userId='sadsadsa', inputText=var)

    if ('message' in lex_response):
        print(lex_response['message'])  
    else: 
        print('Something is gone wrong, you broke me')