Testing DynamoDB ConditionExpression

main.py

import boto3
from boto3.dynamodb.conditions import Attr

test1 = {
    "PK": "ITEM#1",
    "SK": "v0#ACTIVE#20200724T07:08:09Z",
    "data": "random stuff"
}

test2 = {
    "PK": "ITEM#1",
    "SK": "v0#ACTIVE#20200724T08:09:10Z",
    "data": "something else"
}

dynamodb = boto3.resource('dynamodb', region_name='af-south-1')

#prep: create a table and name the Partitian Key = PK and the Sort Key = SK
db = dynamodb.Table("your-table-name")

db_status = db.table_status
try:
    db.put_item(Item=test1, ConditionExpression=Attr("PK").ne(test1["PK"]))
except Exception as e:
    print(f"Error: Could not insert test1. Is it a duplicate?: {str(e)}")

try:
    db.put_item(Item=test2, ConditionExpression=Attr("PK").ne(test1["PK"]))
except Exception as e:
    print(f"Error: Could not insert test2. Is it a duplicate?: {str(e)}")