I mean, once I add environment variable, can trains.conf overwrite it? I am guessing environment variable will have a higher hierarchy.

The things that I want to achieve is:
Block user to access to public server If they configure trains.conf, then it's fine

import os os.environ["TRAINS_API_HOST"] = "YOUR API HOST " os.environ["TRAINS_WEB_HOST"] = "YOUR WEB HOST " os.environ["TRAINS_FILES_HOST"] = "YOUR FILES HOST "