Older articles (2/17)
Transplanting noscript settings and bookmarks to another machine
Using sqlite3 for time management
After some initial experiments with sqlite as a replacement for a json data file format (which I did not pursue in the end), I have now started using sqlite in earnest. And I must say that I quite like it.
At $work, we still have to submit written time sheets …
Database scheme for resin recipes
This document explores how an SQLite database could be used to store data for the resin-calculator. Normally, the recipes are a dictionary keyed to the name of the resin. The value of each recipe is a list of (component, parts-by-weight) tuples. Since a database only contains tables, where each row …
Convert RCS history to git
Before the rise of git, I used rcs as my version control system. Because I want to standardize on git, I am slowly converting old repositories.
In this article I’ll be converting my old perl scripts in ~/src/perl.
Create a fast-import stream
From the existing repo, we create …
Doing calculations with Python
As an engineer I do a lot of calculations. These can be done with pen and paper and a calculator, in an IPython notebook or in a throwaway spreadsheet. All of these methods have shortcomings, though.
Pen and paper is hard to share and (in my case) hard for others …
Improving my Python coding
With leading white space governing the indentation level and so the grouping of statements, Python code already looks relatively clean.
Yet there are additional tools that will help you improve your code.
Pyflakes
The pyflakes checker tries very hard to find errors in Python source files. (It does not care …
Structures in Python
Sometimes I miss the C’s plain old struct in Python.
Of course Python has dictionaries, but I prefer to write a.b over a['b'].
Here are several ways of doing something akin to a struct in Python.
Using a dict subclass
This is the shortest and most general …
State machines in Python
State machines can be relatively easy defined as a data structure.
It has been said that data structures are central to programming. So we should find a way to express a state machine into a data structure.
The following dictionary of state transitions can be used to define a state …
Fixing dependencies after mesa ports consolidation
After the 2017-05-12 mesa port consolidation, there were packages left with missing dependencies. This is how to fix them
Update
The update from mesa 17.0.3 to 17.0.4 merged libGL, libEGL, libglesv2, libglapi, and gbm into mesa-libs, and moved dri to mesa-dri. I performed the update using …