Djangocon: thursday lightning talks

Tags: djangocon, django

(One of my summaries of a talk at the 2018 european djangocon.)

Recording this conference with python and gstreamer - Peter Körner

He’s part of the CCC video team. Most of it is explained on

He showed diagrams of their wonderful setup, but I cannot possibly write that down :-)

The code is at

You’re welcome to ask them questions!

Cosmic ray research - Arne de Laat

Arne used to work in astronomy on a project to do research on particles that result from supernova explosions. These particles can reach our athmosphere (“cosmic rays”).

HiSPARC, high school project on astrophysics research and cosmics. Simple measurement stations, build by the schools, to detect those cosmic rays.

One particle that hits the athmosphere hits other particles, so it results in multiple speed-of-light other particles. So if you detect a bunch of them at almost the same time at several nearby locations, you can more or less work out the direction of the explosion.

See for a sample.

How to propose a talk - Lacy Williams Henschel

The first thing you need is an idea.

  • What have you learned recently?

  • What do you have a strong opinion on.

  • What used to confuse you but now makes sense to you because you finally understand it?

Then… think!

  • Can you sum up your talk in 2 minutes?

  • Look up the CFP (call for proposals). These have requirements and deadlines. Pay attention, also, to the timezone of the deadline.

  • If it is an anonymous review process, make sure you don’t put identifiable info in there.

Then… write!

  • Short abstract.

  • Longer description.

  • Outline. Read the CFP if you need it.

  • A bio. This is surprisingly hard: writing about yourself!

But: check it beforehand. Let someone edit/read it.

  • Friends.

  • Colleagues.

  • Mentors.


  • Do I know enough (yes).

  • What about costs (there is financial aid).

  • Can I present well enough (there are mentors).

I made a clock in python - Leila Verhaegen

Her clock was broken and she wanted a new one. She wanted it to be blue. She build it herself.

(She showed a number of electronic board diagrams).

In the end, she got it to work. Four days of working with the electronic components, two hours of python programming.

MTPU (multi tenant polymorphic users) - Lorenzo Peña

“Multi tenant polymorphic users”. Or “how to handle the same users in different way based on the site which they are using”. One django project, multiple sites.

He used two ingredients:

(I do believe he didn’t pause to take a breath of air during his entire presentation. Great :-) )

Example code is at

The hidden powers of custom django path convertors - Daniel Hepper

It is a somewhat feature that’s new in django 2.0. 2.0 started with the simpler URL format. path('company/<str:name>/', ...) and so. The part between <> is the path converter.

You can write them yourself. You need to register them. The documentation says you should raise a ValueError if you cannot match it. But what happens when it doesn’t match? Apparently it is allowed.

He started a path convertor that you can give an object. It works generally on all your objects.

Photo explanation: constructing a viaduct module (which spans a 2m staircase) for my model railway on my attic.

As a little addition to this day’s summaries’ photos, here’s a video of the finished viaduct: logo

About me

My name is Reinout van Rees and I work a lot with Python (programming language) and Django (website framework). I live in The Netherlands and I'm happily married to Annie van Rees-Kooiman.

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