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• The primary key is required. This code adds an item that has primary key ( year, title) and info attributes.
The info attribute stores sample JSON that provides more information about the movie. • The DecimalEncoder class is used to print out numbers stored using the Decimal class.
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The Boto SDK uses the Decimal class to hold DynamoDB number values. • To run the program, type the following command: python MoviesItemOps01.py Step 3.2: Read an Item In the previous program, you added the following item to the table.
Note This program uses UpdateExpression to describe all updates you want to perform on the specified item. The ReturnValues parameter instructs DynamoDB to return only the updated attributes ( UPDATED_NEW). • To run the program, type the following command: python MoviesItemOps03.py Step 3.4: Increment an Atomic Counter DynamoDB supports atomic counters, where you use the update_item method to increment or decrement the value of an existing attribute without interfering with other write requests.
(All write requests are applied in the order in which they are received.) The following program shows how to increment the rating for a movie. Each time you run it, the program increments this attribute by one. • Copy and paste the following program into a file named MoviesItemOps04.py. ConditionExpression='size(info.actors) >=:num', The condition is now greater than or equal to 3 instead of greater than 3.
• Run the program again. The UpdateItem operation should now succeed. Step 3.6: Delete an Item You can use the delete_item method to delete one item by specifying its primary key. You can optionally provide a ConditionExpression to prevent the item from being deleted if the condition is not met. In the following example, you try to delete a specific movie item if its rating is 5 or less. • Copy and paste the following program into a file named MoviesItemOps06.py.