From the command line
$ python /path/to/library/google_appengine_python_1.5.5/appcfg.py download_data –application=your_app_id –url=http://app_name.appspot.com/remote_api –filename=test.csv
From the command line
$ python /path/to/library/google_appengine_python_1.5.5/appcfg.py download_data –application=your_app_id –url=http://app_name.appspot.com/remote_api –filename=test.csv