Python3: DynamoDB の scan

次に記述してある制約条件を回避する方法です。
scan(**kwargs)

If the total number of scanned items exceeds
the maximum dataset size limit of 1 MB,
the scan stops 

scan_id.py

#! /usr/bin/python
#
#	scan_id.py
#
#					Jul/22/2022
# --------------------------------------------------------------------
import	sys
import  json
import	boto3

# --------------------------------------------------------------------
def scan_all(table, scan_kwargs):
    items = []
    done = False
    start_key = None
    while not done:
        if start_key:
            scan_kwargs['ExclusiveStartKey'] = start_key
        response = table.scan(**scan_kwargs)
        items.extend(response.get('Items', []))
        start_key = response.get('LastEvaluatedKey', None)
        done = start_key is None
    return items
# --------------------------------------------------------------------
def list_id_proc(icount,unit):
    str_out = str(icount) + '\t'
    str_out += unit['id']
    print(str_out)
# --------------------------------------------------------------------
sys.stderr.write("*** 開始 ***\n")

dynamodb = boto3.resource('dynamodb')

name_table = 'cities'

table = dynamodb.Table(name_table)

icount = 0
#
data = scan_all(table, {})
for unit in data:
    list_id_proc(icount,unit)
    icount += 1
#
sys.stderr.write("icount = %d\n" % icount)
sys.stderr.write("len(data) = %d\n" % len(data))
sys.stderr.write("*** 終了 ***\n")
# --------------------------------------------------------------------

レコード数のカウント

aws dynamodb scan --table-name cities --select "COUNT"

参考ページ
Python3: DynamoDB を使う
aws cli で DynamoDB を使う