How to deploy a python app with dependencies similar to npm

If you have a ruby or node.js background, you probably came to appreciate gem and npm. Python is lacking in this respect. Current tools fail "There should be one– and preferably only one –obvious way to do it.". We show how to leverage pip and virtualenv in a non-obvious way.

The internet needs groups

The internet needs groups! I'm not talking about the social entity like groups and individuals. I envision a net entity group like website, webpage, newsgroup or email address.

Constantize in Python

Rails offers a nice function called constantize. It is easy to rebuild this (to some extend) in python. But the price is too high.

Constantize with Care

The String#constantize method is a feature that makes rails fun to code with. This method converts a string to the constant that the string contains (or throws a NameError if there is no such constant). It makes it easy to store class-types in databases as strings and to code controllers that work with classes of the same duck type. Most people know that eval on user data is dangerous, but noboddy seems to care about constantize. Beware, it is also dangerous and you should constantize with care!

Avoiding Shell Injection in Ruby, Python and PHP.

I recently found a shell injection bug in some Ruby-gem I use. Shell injections have scared me for a long time and I usually prefer to whitelist certain characters/patterns rather than to blacklist. This means that the system fails to the save side. Unfortunally it usually does fail – my whitelisting is to rigorous and data that would not cause any problems gets rejected. So I decided to take the opportunity to investigate how to prevent shell injection in my favorite scripting language (Python), the language I found the problem in and finally the language that I can not avoid (PHP).

NoArchive-Tag for Robots-Meta

I tweaked the robots-meta plugin by Joost de Valk for WordPress to support the noarchive tag. This prevents google and from providing cached versions of your blog. I've put up a mercurial repo with my version at