Python-bloggers

New vtreat Feature: Nested Model Bias Warning

January 11, 2020 | John Mount

For quite a while we have been teaching estimating variable re-encodings on the exact same data they are later naively using to train a model on, leads to an undesirable nested model bias. The vtreat package (both the R version and Python version) both incorporate a cross-frame method that allows ... [...Read more...]

CodeWars: Learn programming through test-driven development

January 8, 2020 | Paul van der Laken

As I wrote about Project Euler and CodingGame before, someone recommended me CodeWars. CodeWars offers free online learning exercises to develop your programming skills through fun daily challenges. In line with Project Euler, you are tasked with solving increasingly complex programming challenges. At CodeWars, these little problems you need to ...

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Python vs. R for Data Science: What’s the Difference?

January 7, 2020 | Richie Cotton

If you’re new to data science, or your organization is, you’ll need to pick a language to analyze your data and a thoughtful way to make that decision. Full disclosure: While I can write Python, my background is mostly in the R community—but I'll try ...

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Learn Without Limits With DataCamp’s Mobile Coding Courses

January 3, 2020 | Joyce Chiu

You can learn Python anytime, anywhere. You’ll have a seamless cross-platform learning experience, with the ability to pick up right where you left off on desktop and mobile. We offer the most in-depth and complete learning content for Python availabl...

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New Timings for a Grouped In-Place Aggregation Task

January 2, 2020 | John Mount

I’d like to share some new timings on a grouped in-place aggregation task. A client of mine was seeing some slow performance, so I decided to time a very simple abstraction of one of the steps of their workflow. Roughly, the task was to add in some derived per-group ... [...Read more...]

Python Web Scraping: WordPress Visitor Statistics

December 29, 2019 | Paul van der Laken

I’ve had this WordPress domain for several years now, and in the beginning it was very convenient. WordPress enabled me to set up a fully functional blog in a matter of hours. Everything from HTML markup, external content embedding, databases, and simple analytics was already conveniently set up. However, ... [...Read more...]

History of the Modern Python Dictionary – by Raymond Hattinger

December 28, 2019 | Paul van der Laken

Raymond Hattinger is one of the core Python developers whose talks I’ve featured on my blog before. And rightfully so, as Raymond’s presentations are unarguably entertaining and deeply insightful from an technical perspective. In this recorded talk at the 2016 Annual Holiday Party for Python Devs in San Fransisco ... [...Read more...]

Python Web Scraping: Quotes from Goodreads.com

December 27, 2019 | Paul van der Laken

Over the course of last week, I built a Python program that scrapes quotes from Goodreads.com in a tidy format. For instance, these are the first three results my program returns when scraping for the tag robot: Quote author source likes tags Goodbye, Hari, my love. Remember always–all ... [...Read more...]

A Richer Category for Data Wrangling

December 22, 2019 | John Mount

I’ve been writing a lot about a category theory interpretations of data-processing pipelines and some of the improvements we feel it is driving in both the data_algebra and in rquery/rqdatatable. I think I’ve found an even better category theory re-formulation of the package, which I will ... [...Read more...]

SKEWed perceptions

December 20, 2019 | OSM

The CBOE’s SKEW index has attracted some headlines among the press and blogosphere, as readings approach levels not see in the last year. If the index continues to draw attention, doomsayers will likely say this predicts the next correction or bear ...

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