This is a small post goes back to July 2016, my dad bought me an AEG mitre saw from Bunnings which I had no project in mind and have never done wood work before. So I did big clean up in the garage in the morning to make room for the to be built workshop, then… Read More »
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
“I need to display data on a page, not perform Sub Zero’s original MK fatality.” https://hackernoon.com/how-it-feels-to-learn-javascript-in-2016-d3a717dd577f#.67qnsecr5
View at Medium.com
Been studying electricity lately and stumbled on to this article http://www.powerstream.com/AA-tests.htm Looks like Energizer is a clear winner.
Here is a quick recipe for Django templates, let’s say you are building a Django web which has many list views, and which has pagination, it’s wise to abstract the pagination template out to be reusable by all list view templates. My preference is to keep all reusable templates in a partials folder, and place the… Read More »
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
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
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import requests # local file with open('image.jpg', 'rb') as file: resp = requests.post('http://localhost:8888/image', data=file.read()) url = resp.headers['Location'] # remote file remote_resp = requests.get(image_url, stream=True) resp = requests.post('http://localhost:8888/image', data=remote_resp.content) url = resp.headers['Location'] |
If you are a good python dev, surely you follow PEP8 coding style guidelines, and surely you have installed the flake8 plugin to constantly reminding yourself to format your code properly, and surely you have valid cases that you import stuff but not used, eg. __init__.py and surely your IDE will annoy the fuck out of… Read More »
I was writing a service which import various feeds and then post to another RESTful API, simple enough as below:
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from django.db import connections class Receiver(PolymorphicModel): ... class Database(Receiver): name = models.CharField(max_length=255) def get_data_source(self): return connections[name] |
Then the feed model:
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class Feed(models.Model): receiver = models.ForeignKey('Receiver') def get_data_source(self): return self.receiver.get_real_instance().get_data_source() |
Then run this feed in trivial code:
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import threading function transform_listing(feed): cursor = feed.get_data_source().cursor() .... feed = Feed.objects.create(receiver=Database.objects.create(name='legacy')) for i in range(100): th = threading.Thread(transform_listing, [feed]) th.start() |
And you will quickly notice the threads complaining
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Too many connections |
What it’s happening is Django will create a new connection per thread… Read More »