[Python] How exactly to understand documentations without any explanation in Airflow?

I try to understand The PostgresHook in Airflow. Here is the documentation:

https://airflow.apache.org/docs/apache-airflow/1.10.6/_api/airflow/hooks/postgres_hook/index.html

Now for example if I wanna understand the function

get_conn(self)


I know know what it does, but as a beginner in general, how can I understand how this function works, if there is literally no explanation in the documentation? There is only a link to the source code and that's it. So this means, to understand how the function works, I have to check the source code, right? This is a common way, how these documentations works?

Continue reading...