Imagine you have the following code def do_something(): users = User.objects.filter(dob__gte='1980-01-01') for user in users: # do something to user If you were writing unit test against do_something(), you would need to do some complex mocking on User.objects.filter() to return some mock up data. But this can be easily prevented by refactoring into a separate… Read More »
import os, sys, pathlib # if script is in on 1 level deep # sys.path.append(str(pathlib.Path(__file__).parents[1].absolute())) sys.path.append(str(pathlib.Path(__file__).absolute())) os.environ.setdefault("DJANGO_SETTINGS_MODULE", "main.settings") import django django.setup() # import your django models # do your django work
Consider the following code import logging logging.info('trying to log something') Executing above: It won’t log anything to console, because it default to level warning It won’t log anything to console, because no stream has been set import logging logging.basicConfig(level=logging.INFO) logging.info('trying to log something') logging.basicConfig(level=logging.DEBUG) logging.debug('trying to log something debug') Executing above: Running basicConfig(…) default adds… Read More »
I have been writing python OO for a while and every time when I create a method, I always ask myself, should this be instance method or staticmethod (or classmethod)? As you might already aware that the difference between instance method and static method is that static method doesn’t have access to the instance, same… 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 import requests # local file with open(‘image.jpg’, ‘rb’) as… Read More »
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 »
PHP and Python both are dynamic typed language, so there is no point the discuss anything related in this aspect. Exception is first class citizen try: a = 1 / 0 except: print ‘Caught’ Prints ‘Caught’ Let’s look at PHP: try{ $a = 1 / 0; }catch (Exception $e){ print “Caught”; } I cannot believe… Read More »
Just a code snippet to demo Python script using OpenCV import cv2, time cap = cv2.VideoCapture(0) time.sleep(1) cascade = cv2.CascadeClassifier(“haarcascade_frontalface_alt.xml”) def detect(image): #faces = cascade.detectMultiScale(img, 1.1, 2, cv2.cv.CV_HAAR_SCALE_IMAGE, (20,20), (200,200)) faces = cascade.detectMultiScale(image) for _face in faces: cv2.rectangle(image, (_face[0], _face[1]), (_face[0]+_face[2], _face[1]+_face[3]), (255,255,255)) def repeat(): ret, image = cap.read() detect(image) cv2.imshow(“w1”, image) cv2.waitKey(1) while True:… Read More »
Currently django-cms-search doesn’t support haystack 2.0 yet, so here is my modified version to work on haystack 2.0 based on import datetime from haystack import indexes from cms.models.managers import PageManager from cms.models.pagemodel import Page from cms.models.pluginmodel import CMSPlugin class PageIndex(indexes.SearchIndex, indexes.Indexable): text = indexes.CharField(document=True, use_template=False) pub_date = indexes.DateTimeField(model_attr=’publication_date’, null=True) login_required = indexes.BooleanField(model_attr=’login_required’) url = indexes.CharField(model_attr=’get_absolute_url’)… Read More »