Creating a 'SS' item in DynamoDB using boto3

Question

I'm trying to create an item in AWS DynamoDB using boto3 and regardless what I try I can't manage to get an item of type 'SS' created. Here's my code:

client = boto3.resource('dynamodb', region_name=region)
table = client.Table(config[region]['table'])
sched = {
    "begintime": begintime,
    "description": description,
    "endtime": endtime,
    "name": name,
    "type": "period",
    "weekdays": [weekdays]
}
table.put_item(Item=sched)

The other columns work fine but regardless what I try, weekdays always ends up as a 'S' type. For reference, this is what one of the other items look like from the same table:

{'begintime': '09:00', 'endtime': '18:00', 'description': 'Office hours', 'weekdays': {'mon-fri'}, 'name': 'office-hours', 'type': 'period'}

Trying to convert this to a Python structure obviously fails so I'm not sure how it's possible to insert a new item.

Answer 1

To indicate an attribute of type SS (String Set) using the boto3 DynamoDB resource-level methods, you need to supply a set rather than a simple list. For example:

import boto3

res = boto3.resource('dynamodb', region_name=region)

table = res.Table(config[region]['table'])

sched = {
    "begintime": '09:00',
    "description": 'Hello there',
    "endtime": '14:00',
    "name": 'james',
    "type": "period",
    "weekdays": set(['mon', 'wed', 'fri'])
}

table.put_item(Item=sched)