app.py

import os
import json
import boto3

def lambda_handler(event, context):
  # environment variables are native, so use a language-specific
  # method to access them, not the lambda context
  table = os.environ['TABLE_NAME']

  # use the AWS SDK to scan the table by name
  client = boto3.client('dynamodb')
  response = client.scan(TableName=table)
  
  # dump the scan response into the http response
  return {
    "statusCode": 200,
    "body": json.dumps(response),
  }