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Creating a Pipeline Tutorial

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.