human
Complete the below
def _quota_reserve(context, project_id):

    ''''Create sample Quota, QuotaUsage and Reservation objects.
    There is no method db.quota_usage_create(), so we have to use
    db.quota_reserve() for creating QuotaUsage objects.
    Returns reservations uuids.'
    '''
assistant
#Here is the Python code you requested.
    def get_sync(resource, usage):
        def sync(elevated, project_id, session):
            return {resource: usage}
        return sync
    quotas = {}
    resources = {}
    deltas = {}
    for (i, resource) in enumerate(('volumes', 'gigabytes')):
        quota_obj = db.quota_create(context, project_id, resource, (i + 1))
        quotas[resource] = quota_obj.hard_limit
        resources[resource] = quota.ReservableResource(resource, ('_sync_%s' % resource))
        deltas[resource] = (i + 1)
    return db.quota_reserve(context, resources, quotas, deltas, datetime.datetime.utcnow(), datetime.datetime.utcnow(), datetime.timedelta(days=1), project_id)