Recently at work, I encountered a problem with a function that should have returned a custom promise subclass. The goal of this subclass is to be able to call a cancel method to cancel some pending action done within the promise and then reject it. It looks like this:

class …

While wandering how to run some tests with JavaScript, I discorvered that deno, a JavaScript runtime like NodeJS, has support for jupyter notebooks thanks to this article. It works perfectly. Install deno (probably available in your distribution repositories), run deno jupyter --install and you are good to go!

To get …

In previous articles, I provided some tips on enums and explained how to use a custom class with Pydantic. Now, I’ll dig into all kinds of enum usages with Pydantic, including enums whose members are Pydantic models themselves! Let’s dive right in!

Just like before, you can access …

I’ll give some tips to reuse field and model validators and serializers. All my examples will use validators, but it works exactly the same for serializers.

def _is_above_ten(value: int):
    if value > 10:
        return value

    raise ValueError(f"{value …

Pydantic is an awesome data validation library for Python. It’s getting very popular these days because it’s fast, has lots of features and is pleasant to use. I’m using it at work and it personal projects. It’s one of the strong points of FastAPI, the new …

You can export a notebook directly from the interface under File > Save and Export Notebook As. You can also do it in CLI with:

jupyter nbconvert --execute --to <FORMAT> my_notebook.ipynb

The --execute will execute the notebook to make sure all output cells are up to date. Many export formats …

As part of my work to uniformize my server setup around systemd, I decided to make nginx log everything with journald. By default, it logs accesses and errors in log files under /var/log/nginx. I already had one log file per vhost.

To do the change, I changed my …

I’d like to share a few tips I recently (re)discovered about Python’s enums. While interesting on its own, this article is also paving the way on a more advanced article I hope to write soon. Let’s dive right in!

I recently learned while reading psycopg’s documentation (a Python driver for PostgreSQL), that you should use WHERE id = ANY(:values) instead of WHERE id IN :values when filtering over lists. That’s because the ANY operator works with empty list while IN doesn’t. Psycopg will also correctly adapt …

Let’s encrypt recently announced they will stop sending emails when certificates must be renewed. Following this announcement, I created a small script to monitor the status of my certificates and receive an email if they are not renewed in time. Since it can be handy, here it is!

The …