Category Archives: Technology

Geeky stuff

Current state of solar energy for NZ customers

Recently there is a wave of ads/posts on my facebook about solar energy, ranging from installations to solar tax. I did a quick calculation from https://www.energywise.govt.nz/tools/solar-calculator/, using all the standard attributes and costs, it worked out that I will save a HUGE(not) $1100 in 22 years, that is without any issues within 22 years. I don’t really think… Read More »

Reading Material: Recognizing Traffic Lights With Deep Learning

A pretty good Non-AI-Experience required article talking about how to train models to recognise traffic lights. It has a few link references that will be very helpful for my future AI training/projects, eg. image-net.org https://medium.freecodecamp.com/recognizing-traffic-lights-with-deep-learning-23dae23287cc#.k941su69v

Django Rest Framework QuerySet

I have just created this python library so that you can query the remote api just like the Django queryset. It is particularly usefully when used in Django ListView with pagination. https://github.com/variable/django-rest-framework-queryset 

Posting image to thumbor using requests package

Seems like there are not many code sample there, and the requests documentation was giving the wrong hint to use files={‘file’: open(‘image.jpg’)} which you will end up getting 415 response code. I think I will just share my working sample code here to save someone’s time

 

Make sure you are closing the DB connections after accessing Django ORM in your threads

I was writing a service which import various feeds and then post to another RESTful API, simple enough as below:

Then the feed model:

Then run this feed in trivial code:

And you will quickly notice the threads complaining

What it’s happening is Django will create a new connection per thread… Read More »