Blog
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Python’s objects and classes — a visual guide
Python developers love to say that “everything is an object.” And indeed, when I teach Python classes, I say this several times, and many people nod in agreement, assuming that
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Registration is open for my October Webinars (about regexps and technical training)
September has been busy with work and holidays, but I’m gearing up for an exciting and busy October. Among other things, I’m giving two (free) Webinars in that month, and
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Now available: My interview on “Developer on Fire” about training programmers
I was recently interviewed by Dave Rael for the “Developer on Fire” podcast. That episode has now been released, at http://developeronfire.com/Podcast/Episodes/reuven-lerner-sharing-insight. Enjoy!
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In PostgreSQL, as in life, don’t wait too long to commit
I recently helped a client with serious PostgreSQL problems. Their database is part of an application that configures and monitors large networks; each individual network node reports its status to
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Announcing: Coaching for technical trainers
What, exactly, do I do for a living? Yes, I’m a programmer — or as I’m supposed to say nowadays, a “full-stack Web developer.” And yes, I’m a lead developer/CTO.
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Understanding nested list comprehensions in Python
In my last blog post, I discussed list comprehensions, and how to think about them. Several people suggested (via e-mail, and in comments on the blog) that I should write
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Want to understand Python’s comprehensions? Think in Excel or SQL.
Comprehensions are among the most useful constructs in Python. They merge the old, trusty “map” and “filter” functions into a single piece of compact, elegant syntax, allowing us to expression
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Why you should almost never use “is” in Python
It’s really tempting, when you first start to use Python, to use “is” rather than “==”. It’s a bit more readable, and it feels like it should just work, especially
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Free Webinar on June 23rd: Introduction to Regular Expressions
If you’re a programmer, then you have likely heard about regular expressions (“regexps”) before. However, it’s also likely that you have tried to learn them, and have found them to
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New ebook: Jewish guide to visiting China
As many people know, I’ve visited China seven times over the last three years, traveling there to give courses in Python and Ruby. I just got back from my most