In Lesson 2 of the Pipeline tutorial, a pretty simple "empty" pipeline is created.
Eventually this line is given:
result = run_pipeline(my_pipe, '2015-05-05', '2015-05-05')
and this "returns a pandas DataFrame indexed by date and securities."
So does run_pipeline() always return a DataFrame with securities information?
Just seems weird that out of nowhere we have all this ticker info and the
tutorial doesn't say where it came from.