Simple Python lambda function to store & list information from DynamoDB

save-dynamo.py

import json
import boto3
from datetime import datetime

def lambda_handler(event, context):
    dynamodb = boto3.resource('dynamodb')
    client = boto3.client('dynamodb')
    
    queryStringParameters = event.get("queryStringParameters", {})
    list_items = queryStringParameters.get("list_items", "false")
    
    tableTemperature = dynamodb.Table('my-dynamo-table')
    
    if list_items == 'true':
        response = tableTemperature.scan()
        print(response['Items'])
        return {
            'statusCode': 200,
            'body': json.dumps(response['Items'])
        }
    else:
        params = json.loads(event.get('body'))
        eventDateTime = (datetime.now()).strftime("%Y-%m-%d %H:%M:%S")
        my_field = params['my_field']
    
        try:
            
            tableTemperature.put_item(
               Item={
                    'date': eventDateTime,
                    'status': 'pending',
                    'my_field' : my_field
                }
            )
            
            return {
                'statusCode': 200,
                'body': json.dumps('Succesfully inserted!')
            }
        except:
            print('Closing lambda function')
            return {
                    'statusCode': 400,
                    'body': json.dumps('Error saving')
            }