Recommender system in python

I have built a web-site on my machine. I want to incorporate a "Product Recommendation" feature.

I already have user names, product names and user reviews for those products in a csv file which I have exported using "mongoexport".

I want to recommend a user an item using the Collaborative filtering, which will generate a csv or text file containing users and their recommendations based on their similarity with other users. So that I can use this file to display recommended product for user on the website.

Any suggestions how to implement it is welcome.