Some tips on observables
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Articles in the Trucs et astuces category
Using super to reuse method with inheritance in Python
If you use Python, you probably already know of super to call a method from the base class. You probably also know you can use a function as a method if it takes the instance as 1st parameter. What you cannot do, is call super().my_method() directly in such a …
Using JavaScript and TypeScript in jupyter notebook
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 …
Reusing Pydantic validators and serializers
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.
Field validators
Assign the validator to a variable like so:
def _is_above_ten(value: int): if value > 10: return value raise ValueError(f"{value …
Converting jupyter notebooks
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 …
Sending all nginx logs to journald
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 …
PostgreSQL using ANY instead of 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 …
Monitor certificates statuses
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 …
Execute Python scripts over SSH without copying them
You can run scripts (written in Python or any other language) directly on a server if the proper interpreter is installed. I recently used it to run a Python script over several servers without the need to copy the relevant script on the server. It all relies on the following …
Ignore commits in git blame
Commits that change formatting are a pain in git because they make using git blame much harder. It turns out, you can ask git to ignore these commits when running git blame with the --ignore-rev option and passing it a commit hash. You can even do things better and create …