@app.route('/<version>/')
def api_docs(version):
    if version in versions:
        return jsonify(status=200,
            documents='%s/api/%s' + (settings.API_DOCS_URL, version))
    else:
        return jsonify(status=404, message="Please check the API version."), 404
dataset/ETHPy150Open teampopong/popong-api/api/__init__.py/api_docs/operator `%` -> `+`