About me

Hello! I am Petri Lehtinen, a Finnish software developer who mostly hacks in Python, Javascript and C. In the Internet, I'm sometimes also known as “akheron” or “akhern”. To contact me, drop an email to petri@digip.org.

I have a few projects and I also used to update my blog every now and then. Less so nowadays.

I use Arch Linux, Emacs and Git.

My PGP public key is available here. Its fingerprint is B5D6 953E 6D50 59ED 7ADA 0F2F D365 7D24 D058 434C. I use the key mainly to sign tarballs that I create for the releases of my projects.

In the past, releases were signed with my old key. It's still available here.

Me around the web:

• GitHub
• Twitter
• Keybase

Projects

All the projects here are free open source software.

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

• Jansson — C library for working with JSON data
• Multipy — Install multiple Python versions locally
• Sala — Simple encrypted password storage
• Sinap — IRC bot built on top of asyncio
• Stango — Static website generator for Python programmers

Python is one of my favourite programming languages, and I used to be one of its core developers.

Some other significant projects I've contributed to, more or less:

• Linux — The most awesome operating system kernel on Earth
• ElasticSearch — A distributed real-time search and analytics engine
• OpenEmbedded — Build framework for embedded Linux
• Tornado — Scalable, non-blocking web server and tools
• U-Boot — The universal bootloader
• Ubuntu — My old favourite Linux distro

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 four 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 :-)