Three uses for functools.partial() in Django
Python’s functools.partial is a great tool that I feel is underused.
functools.partial() in DjangoPython’s functools.partial is a great tool that I feel is underused.
Google has started rolling out FLoC, currently to 0.5% of Chrome users, and some sites are already disabling it. In this post we’ll cover what FLoC is, who’s disabling it, why, and how to do so on a Django site.
Here are three new security headers on the block:
heroicons is a free SVG icon set for your websites, from the creators of tailwindcss. SVG icons are great - they’re small, they sit inline in your HTML, and you can scaled and colour them with plain HTML and CSS. And heroicons is a great icon set - minimal, clear, and consistent.
I created django-feature-policy in 2018 allow Django projects to control the draft security header Feature-Policy. Feature-Policy allows your site to restrict which origins can use some sensitive browser features, such as the the payments API or access to the webcam. This is valuable if you’re using any third party JavaScript. Whether such JavaScript comes from npm or an external script tag, you can protect against it doing some bad things with your users.
I recently upgraded my client ev.energy to PostgreSQL 13. The first feature listed in this version’s release notes is “Space savings and performance gains from de-duplication of B-tree index entries”. I reindexed all tables after the upgrade to take advantage of this deduplication and saw index storage savings of up to 90%.
TestCase from using setUp() to setUpTestData()Django’s TestCase class provides the setUpTestData() hook for creating your test data. It is faster than using the unittest setUp() hook because it creates the test data only once per test case, rather than per test.
Another way to use Django’s CheckConstraint class to ensure your data is valid. Based on my answer to a question on the Django forum.
IPython is an improved Python shell for interactive use. It has many great features such as syntax highlighting, autocomplete, and powerful “magic commands”. I love it, use it on every project, and use the IPython prompt for examples on my blog.
It’s now a long-running tradition that each Django release has an associated “code word”. This is used by the release manager in the announcement blog post to describe the list of features coming in the next version.
I wrote my library time-machine last year as a way to speed up tests that need to accurately mock the current time.
Django 3.2 had its first alpha release a couple of weeks ago and the final release will be out in April. It contains a mezcla of new features, which you can check out in the release notes. This post focuses on the changes to testing, a few of which you can get on earlier Django versions with backport packages.
Yet another use case for creating a database constraint with Django’s CheckConstraint class.
Here’s another use case for creating a database constraint with Django’s CheckConstraint class.
For all my linting needs these days I use the pre-commit framework. It has integrations with every tool I want to use, and uses Git’s hooks to prevent non-passing code from ever being committed.
I recently optimized a client project’s test suite, and in the process found a test whose runtime had crept up ever since it had been written. The problematic test exercised an import process from a fixed past date until the current day. The test’s runtime therefore grew every day, until it reached over a minute.
For my new Django project, DB Buddy, I’m using CloudFlare as my CDN. It has a bunch of useful features that would otherwise take extra work, such as DDoS protection, HTML minification, and analytics.
A client project recently was suffering from an N+1 queries problem in a complicated Django admin page. Many measures had already been taken to prevent N+1 queries, such as use of django-auto-prefetch and some manually tuned select_related() / prefetch_related() calls. The remaining N+1 in question was a bit resistant to those methods because it came through several layers of admin code and many-to-many fields, making it harder than normal to find the place to modify the QuerySet construction.
If you start the development server on a Django project, it looks something like this:
In recent years browsers have gained many powers to report back problems they encounter on your site, such as:
Today I learned about the better-exceptions package. It makes exception output better, providing more context and colourization on the terminal.
In all current releases of the popular WSGI server gunicorn, the Server header reports the complete version of gunicorn. I spotted this on my new project DB Buddy. For example, with httpie to check the response headers:
If you’re testing Python code that relies on the current date or time, you will probably want to mock time to test different scenarios. For example, what happens when you run a certain piece of code on February 29? (A common source of bugs.)
It can be tricky to ensure all the environments that your project runs on use the same versions of Python, PostgreSQL, and other external dependencies. Often development, CI, and cloud environments have different configuration systems, making them hard to keep in sync. And coordinating between all your team members to upgrade their local environments can be complicated, as upgrade emails or instant messages get forgotten if they are away on holiday, working on other projects, etc. And using the wrong versions of external dependencies can lead to hard-to-debug errors, wasting time to find such a simple fix.
If you’ve used Django migrations for a while, you may be familiar with this message: