Get human readable state of the door from dynamo table

read-door-state.py

import json
import boto3
import decimal
import datetime
import calendar

class DecimalEncoder(json.JSONEncoder):
    def default(self, o):
        if isinstance(o, decimal.Decimal):
            return float(o)
        return super(DecimalEncoder, self).default(o)
        
dynamodb = boto3.resource('dynamodb')
table = dynamodb.Table("<DOOR-STATE-TABLE-NAME>")

def lambda_handler(event, context):
    value = table.get_item( Key = {'timestamp': 0} ).get("Item")
    
    door_is = "unlocked"
    emoji="🔓"
    if value.get("currentstate") == 1:
        emoji="🔐"
        door_is = "locked"
    time = value.get("time")
    
    real_time = datetime.datetime.strptime(time, '%Y-%m-%d %H:%M:%S.%f%z')
    when = "{hour} on {day}".format(
        hour=real_time.strftime("%I:%M") , 
        day=calendar.day_name[real_time.weekday()])
    
    value["message"] = "{emoji} Door was last {state} at {time}".format(emoji=emoji,state=door_is, time=when)
    return {
        'statusCode': 200,
        'body': json.dumps(value, cls=DecimalEncoder)
    }