$ pip install -r requirements.txt
$ export OPENAI_API_KEY=sk-...
$ python3 -c'from langchain_bot_simple import print_answer; print_answer("who is the lead singer of matchbox 20")'
The lead singer of Matchbox 20 is Rob Thomas.
SOURCES: https://en.wikipedia.org/wiki/Matchbox_Twenty
$ dagit -f langchain_bot.py