view = Flask(__name__, static_url_path=‘/subdir/static',static_folder='static')
view.add_url_rule('/static/<filename>', 'static')
print(view.url_map)
## Map([<Rule '/subdir/static/<filename>' (GET, HEAD, OPTIONS) -> static>,
## <Rule '/static/<filename>' (GET, HEAD, OPTIONS) -> static>])

view = Flask(__name__)
static_url = Blueprint('static_url', __name__, url_prefix='/subdir/', static_folder='static')
view.register_blueprint(static_url)