faster iteration over batches of rows with uuid ids

scroll_uuid.py

from .models import Thing
import time

all_ids = []
size = 10000
num_items = Thing.objects.count()
qs = Thing.objects.order_by('id')
last_id = qs.first().id

count = 0
while True:
    tic = time.time()
    # this instead of qs[count:count+size]
    things = qs.filter(id__gt=last_id)[:size]
    if len(things) == 0:
        print('done')
        break
    for thing in things:
        all_ids.append(thing.id)
    toc = time.time() - tic
    last_id = item.id
    print(toc, count, last_id)
    count += size