The pipeline concept can be a bit difficult to wrap one's head around at first. But, once over the initial 'hump', it's pretty straightforward. Have no fear.
Also, it doesn't help that the the word 'pipeline' is used in other areas where it doesn't completely match with the Quantopian definition. The scikit-learn link listed above is an example. It's conceptually similar (ie a pipeline is 'thing' which performs sequential tasks) but isn't really the same other than the name.
Let's start with the imports. When one imports the following
from quantopian.pipeline.data import EquityPricing, factset
the two classes
DataSets. They are definitions for how to connect to the correct field in the data database. They aren't the data itself just the connection info. So, doing something like this
df = USEquities
doesn't assign any data to 'df' rather just info on how to get the data. To get a list (or more precisely a dataframe) of the data, one needs to execute the pipeline using the
run_pipeline method. The result of that is the data. Maybe read through the docs (https://www.quantopian.com/help#base-classes) for the definition of
All that said, there is another post which may make it more clear. Take a look at this (https://www.quantopian.com/posts/need-help-with-pipeline-just-a-beginner ).
Hope that helps. Good luck.
The material on this website is provided for informational purposes only and does not constitute an offer to sell, a solicitation to buy, or a recommendation or endorsement for any security or strategy, nor does it constitute an offer to provide investment advisory services by Quantopian. In addition, the material offers no opinion with respect to the suitability of any security or specific investment. No information contained herein should be regarded as a suggestion to engage in or refrain from any investment-related course of action as none of Quantopian nor any of its affiliates is undertaking to provide investment advice, act as an adviser to any plan or entity subject to the Employee Retirement Income Security Act of 1974, as amended, individual retirement account or individual retirement annuity, or give advice in a fiduciary capacity with respect to the materials presented herein. If you are an individual retirement or other investor, contact your financial advisor or other fiduciary unrelated to Quantopian about whether any given investment idea, strategy, product or service described herein may be appropriate for your circumstances. All investments involve risk, including loss of principal. Quantopian makes no guarantees as to the accuracy or completeness of the views expressed in the website. The views are subject to change, and may have become unreliable for various reasons, including changes in market conditions or economic circumstances.