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Seeking help: "run_pipeline" vs "Pipeline", "Returns" vs "stocktwists"

Hi all,

I know it's too elementary, but I hope you can give me some advise. In the following coding, I know that "run_pipeline" and "stocktwits" are functions. Then, how about "Pipeline" and "Returns"? They are capitalized, and in green color.

from quantopian.research import run_pipeline
from quantopian.pipeline import Pipeline
from quantopian.pipeline.factors import Returns
from quantopian.pipeline.data.psychsignal import stocktwits

Cheers

Anthony