you're almost there.

flip a few lines around to rewrite the query to select from product... 
 e.g. something like

SELECT r_product_list.* FROM r_product_list
JOIN r_product_category_history_list on 
r_product_list.r_id=r_product_category_history_list.r_id
JOIN r_product_reviews_historical_details_list on 
r_product_list.most_recent_historical_reviews_id=r_product_reviews_historical_details_list.id
 

then it should be clear how to convert to the sqlalchemy syntax.

-- 
SQLAlchemy - 
The Python SQL Toolkit and Object Relational Mapper

http://www.sqlalchemy.org/

To post example code, please provide an MCVE: Minimal, Complete, and Verifiable 
Example.  See  http://stackoverflow.com/help/mcve for a full description.
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