LambdaGET.py

import json
import boto3
from datetime import datetime

ddb = boto3.client('dynamodb')

def lambda_handler(event, context):
    today = datetime.utcnow().strftime('%d%m%Y')
    try:
        lulz = ddb.get_item(TableName='morti-di-stima', Key={'data': {'S': today}})['Item']['morti']['S']
    except:
        lulz = 0
    res = '<h1>' + lulz + '</h1>'
    res += '''
    <form action="/" method="post">
        <input type="submit" value="RIP (+1 morte)"/>
    </form>
    '''
    return {
        "statusCode": 200,
        "body": res,
        "headers": {
            'Content-Type': 'text/html',
        }
    }

LambdaPOST.py

import json
import boto3
from datetime import datetime

ddb = boto3.client('dynamodb')

def lambda_handler(event, context):
    today = datetime.utcnow().strftime('%d%m%Y')
    try:
        lulz = int(ddb.get_item(TableName='morti-di-stima', Key={'data': {'S': today}})['Item']['morti']['S'])
    except:
        lulz = 0
    lulz += 1
    ddb.put_item(TableName='morti-di-stima', Item={
        'data':{
            'S': today,
        },
        'morti': {
            'S': str(lulz)
        }
    })