Flask app does not use routes defined in another module
You have four modules here:
__main__, the main script, the file you gave to the Python command to run.config, loaded from theconfig.pyfile.views, loaded from theviews.pyfile.app, loaded fromapp.pywhen you useimport app.
Note that the latter is separate from the first! The initial script is not loaded as app and Python sees it as different. You have two Flask objects, one referenced as __main__.app, the other as app.app.
Create a separate file to be the main entry point for your script; say run.py:
from app import appimport configif __name__ == '__main__': app.run(host=config.host, port=config.port, debug=config.debug)and remove the import config line from app.py, as well as the last two lines.
Alternatively (but much uglier), use from __main__ import app in views.py.