About me

Hello! I am Petri Lehtinen, a Finnish software developer who mostly hacks in Python, C and Javascript. In the Internet, I'm sometimes also known as “akheron” or “akhern”. To contact me, drop an email to my first name at this domain (address obfuscated to avoid spam), or /msg akheron in IRCnet or freenode.

I have a few projects and I also try to update my blog every now and then.

I use Ubuntu, Emacs and Git.

My PGP public key is available here. Its fingerprint is 21DA 7E1F AB1B 03AE DF65 2FF2 3782 02A6 D4E3 9B36. I use the key mainly to sign tarballs that I create for the releases of my projects.

Me around the web:

• GitHub
• Twitter
• Delicious
• Launchpad

Projects

All the projects here are free open source software.

Projects I've started and am the main author of:

• Autotoolized Lua — Patches to "autotoolize" the Lua interpreter source
• Jansson — C library for working with JSON data
• Multipy — Install multiple Python versions locally
• Sala — Simple encrypted password storage
• Stango — Static website generator for Python programmers

Significant projects I've contributed to, more or less:

• Linux — The most awesome operating system kernel on Earth
• OpenEmbedded — Build framework for embedded Linux
• Python — My favourite interpreted programming language
• Tornado — Scalable, non-blocking web server and tools
• Trombi — Asynchronous CouchDB client for Tornado
• U-Boot — The universal bootloader

Publications

I worked for the Department of Software Systems in Tampere University of Technology for a few years. This is a list of research papers I worked on during that period:

• A. Valmari, P. Lehtinen. Efficient Minimization of DFAs with Partial Transition Functions. 25th International Symposium on Theoretical Aspects of Computer Science (STACS). Bordeaux, France, February 21-23, 2008. At the time of publication, this paper presented the fastest known minimization algorithm for Deterministic Finite Automata (and AFAIK, it still does). The paper is available online.
• T. Elomaa, P. Lehtinen. Maintaining Optimal Multi-way Splits for Numerical Attributes in Data Streams. 12th Pacific Asia Conference on Knowledge Discovery and Data Mining (PAKDD). Osaka, Japan, May 20-23, 2008.
• T. Elomaa, P. Lehtinen, M. Saarela. Obtaining Low Arity Discretizations from Online Data Streams. 17th International Symposium on Methodologies for Intelligent Systems (ISMIS). Toronto, Canada, May 20-23, 2008.

In real life...

I have a wife and two kids, and that's why I don't have much time to work on my hobby projects. And, to make things clear, I'm completely happy with this situation :-)