Python

One morning you find out your favorite Airflow DAG did not ran that night. Sad… Six months later the task ran twice and now you understand: you scheduled your DAG timezone aware and the clock goes back and forth sometimes because of Daylight Saving Time. For example, in Central European Time (CET) on Sunday 29 March 2020, 02:00, the clocks were turned from “local standard time” forward 1 hour to 03:00:00 “local daylight time”. And recently, on Sunday 25 October 2020, 03:00 the clocks were turned from “local daylight time” backward 1 hour to “local standard time” instead. That means that any activity between 02:00 and 03:00 will not exist, or exists twice. ...

With Python, creating a database connection is straightforward. Yet, I often see the following case go wrong, while a simple solution is easily at hand by using the context manager pattern. For database connections, you’ll need at least one secret. Let’s say you get this secret from a secret manager by running the get_secret() method. You also use an utility like JayDeBeApi to setup the connection and you are smart enough to close the connection after querying and deleting the password: ...

For a project I was specifically asked to build an API using Python Django. So, my first starting point was to google “django cookiecutter” which immediately brought me to this amazing cookiecutter project. What I am going to demonstrate here is how to quickly setup the project (for the sake of completeness) and use Gitlab Continuous Integration to automatically unit test, run linters, generate documentation, build a container and release it. ...