According to the Flask readme, blueprint static files are accessible at blueprintname/static. But for some reason, it doesn\'t work.
My blueprint is lik
You probably registered your Blueprint to sit at the root of your site:
app.register_blueprint(core, url_prefix='')
but the static view in the Blueprint is no different from all your other Blueprint views; it uses that url_prefix value to make the URL unique.
The core static view is also active, so you now have two routes that want to handle /static/ URLs. So if you are registering your Blueprint without a URL prefix, you have to give one of these two a unique path.
Either give the Blueprint a custom static_url_path value, or the core Flask app.