batch upload json to dynamodb using boto3

Question

I would like to batch upload a json file to dynamodb. At the moment I can successfully manually put items in a python file (as below) and upload to a table, however how can I amend the script to read an external json file (containing 200 items) and batch upload all 200 items to the table.

import boto3

dynamodb = boto3.resource('dynamodb')
table = dynamodb.Table('exampletable')

with table.batch_writer() as batch:
    batch.put_item(
        Item={
            'ID': '2',
            'DateTime': '21/12/2017 13:16',
            'SourceDevice': '10',
            'DestinationDevice': '20',
            'DataType': 'full',
            'Activity': 'unusual'

    }
)
    batch.put_item(
        Item={
            'ID': '3',
            'DateTime': '21/12/2017 13:40',
            'SourceDevice': '10',
            'DestinationDevice': '20',
            'DataType': 'full',
            'Activity': 'unusual'

    }
)

json file contents as below

[{
"ID": "1",
"DateTime": "21/12/2017 13:16",
"SourceDevice": "10",
"DestinationDevice": "20",
"DataType": "part",
"Activity": "normal"
}, {
"ID": "1",
"DateTime": "21/12/2017 13:16",
"SourceDevice": "40",
"DestinationDevice": "25",
"DataType": "full",
"Activity": "unusual"
}]

Answer 1

You would simply break that down into two tasks:

1. Reading the JSON from a file
2. Looping through the JSON, calling batch.put_item each time.

There are lots of results when you do a search for the first task. And the second task is literally just writing a loop.

A full solution would look something like this:

import json
import boto3

dynamodb = boto3.resource('dynamodb')
table = dynamodb.Table('exampletable')

# Read the JSON file
with open('items.json') as json_data:
    items = json.load(json_data)

    with table.batch_writer() as batch:

        # Loop through the JSON objects
        for item in items:
            batch.put_item(Item=item)