BasPH edited a comment on issue #8255: Config value interpolation not working when set as environment variable URL: https://github.com/apache/airflow/issues/8255#issuecomment-612505957 Dug a bit more into this issue. It seems Airflow builds its configuration in a rather odd way. First there is an `AirflowConfigParser`, which is the class you get when importing `from airflow.configuration import conf`. In addition to overriding e.g. `ConfigParser.get()`, to support fetching configuration from environment variables and others, the AirflowConfigParser also holds an attribute `airflow_defaults` with is a "standard" ConfigParser by itself, used for looking up default values if none of the custom ways for setting config are used. This makes it difficult to fix this issue. Interpolation of config values is done in an `Interpolation` class, which can be overridden to also support fetching values from the custom config. However, since there a (standard) ConfigParser inside the AirflowConfigParser for the default values, we'd have to hack around to also support the custom config fetching ways in there. All in all, it might be technically possible to fix, but I'd rather opt for rewriting the whole configuration module, to avoid more hacking and take the opportunity to create something simple to understand.
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