datastore_cleaner.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

from gcloud import datastore
import os

project = os.environ.get('GAE_PROJECT')
print "target : " + project

client = datastore.Client(project)
query = client.query(kind='')
query.keys_only()
task = query.fetch()
for entity in task:
    key = entity.key

    if key._path[0]['kind'].startswith('__') == False: # meta系のレコードは消さない
        print "delete at : " + key._path[0]['kind'] + " : " + key._path[0]['name']

        client.delete(key)