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UPDATE: If you're interested in learning pandas from a SQL perspective and would prefer to watch a video, you can find video of my 2014 PyData NYC talk here. A while back I claimed I was going to write a couple of posts on translating pandas to SQL. I never followed up. However, the other week a couple of coworkers expressed their interest in learning a bit more about it - this seemed like a good
Despite having done it countless times, I regularly forget how to build a cohort analysis with Python and pandas. I’ve decided it’s a good idea to finally write it out - step by step - so I can refer back to this post later on. Hopefully others find it useful as well. I’ll start by walking through what cohort analysis is and why it’s commonly used in startups and other growth businesses. Then, we’
Imagine you have a 4.2GB CSV file. It has over 12 million records and 50 columns. All you need from this file is the sum of all values in one particular column. How would you do it? Writing a script in python/ruby/perl/whatever would probably take a few minutes and then even more time for the script to actually complete. A database and SQL would be fairly quick, but then you'd have load the data,
This is part of a series of posts I have written about web scraping with Python. Web Scraping 101 with Python, which covers the basics of using Python for web scraping. Web Scraping 201: Finding the API, which covers when sites load data client-side with Javascript. Asynchronous Scraping with Python, showing how to use multithreading to speed things up. Scraping Pages Behind Login Forms, which sho
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