A PynamoDB example for items larger than 64k.

pynamodb_large_item.py

from pynamodb.models import Model
from pynamodb.attributes import (
    UnicodeAttribute, NumberAttribute
)


class Thread(Model):
    table_name = "Thread"
    forum_name = UnicodeAttribute(hash_key=True)
    subject = UnicodeAttribute(range_key=True)
    content = UnicodeAttribute()
    parts = NumberAttribute(null=True)


# 64k of content, making the whole object larger than 64k
content = "word" * (1 << 14)

# The writes can be batched
with Thread.batch_write() as batch:
    thread = Thread("ForumName", "subject")
    # Half the content
    thread.content = content[:32768]

    # You could use a simple loop and counter here
    thread.parts = 2
    thread_part_2 = Thread("ForumName", "subject-1")
    thread_part_2.content = content[32768:]

    batch.write(thread)
    batch.write(thread_part_2)

# Items can be queried in batch as well
item = Thread.get("ForumName", "subject")

# Build up a list of keys (the first item is excluded because we already have it)
item_keys = [("ForumName", "subject-{0}".format(part) for part in range(item.parts)[1:])]

for item in Thread.batch_get(item_keys):
    print(item)

# Alternative using query for a prefixed range key
for item in Thread.query("ForumName", subject__begins_with='subject-'):
    print(item)