A helper function for grabbing pseudo-namespaced configuration options from a Flask application

helpers.py

def namespaced_config_options(app, prefix):
    """Returns a dictionary of configuration options built from
    the specified Flask application and string prefix. Keys in the
    resulting dictionary will be lowercase.

    :param app: a Flask application
    :param prefix: a configuration namespace prefix. e.g. `IMAGE_STORE`
    """
    rv = {}
    for key, value in app.config.iteritems():
        if not key.startswith(prefix):
            continue
        rv[key[len(prefix):].lower()] = value
    return rv