amazon dynamodb - Error when creating items AWS Lambda to DynamDb with python -

i trying create new item in table , every time run following code:

from __future__ import print_function decimal import * import boto3 import json  def my_handler(event, context):     marker = event['m']     latitude = decimal(event['lat'])      longitude = decimal(event['lon'])     tableminfo = 'minfo'     client = boto3.client('dynamodb')      client.put_item(       tablename = tableminfo, item = {       'marker':{'n' : marker},       'latitude':{'n' : latitude},       'longitude':{'n' : longitude},         }     )      success = "success"          return {'success' : success} 

with following test parameters in lambda

{   "m": 1,   "lat": 52.489505,   "lon": 13.389687 } 

i receive error on following lines: 17, "my_handler", "'longitude':{'n' : longitude},"

you must update values string:

client.put_item(       tablename = tableminfo, item = {       'marker':{'n' : str(marker)},       'latitude':{'n' : str(latitude)},       'longitude':{'n' : str(longitude)},         }     )