config

def create_app(config_settings=None):
    app = Flask(__name__)
    
    file_handler = RotatingFileHandler('app.log')
    file_handler.setFormatter(Formatter(
        '%(asctime)s %(levelname)s: %(message)s '
        '[in %(pathname)s:%(lineno)d]'
    ))
    file_handler.setLevel(logging.DEBUG)
    app.logger.addHandler(file_handler)
    
    # without this line I don't get any log
    # statements written to my file when 
    # using current_app.logger.info("")
    # in my blueprint
    app.logger.setLevel(logging.DEBUG)
    app.register_blueprint(frontend)

    return app