Retrieving spot price with boto3

Question

Hello,
I have the following function retrieving the price for an 'on-demand' instance:

```
    def get_price(self, region, instance, os):
        FLT = '[{{"Field": "operatingSystem", "Value": "{o}", "Type": "TERM_MATCH"}},' \
            '{{"Field": "instanceType", "Value": "{t}", "Type": "TERM_MATCH"}}]'
        f = FLT.format(r=region, t=instance, o=os)
        rrr = boto3.client('pricing')
        data = rrr.get_products(ServiceCode='AmazonEC2', Filters=json.loads(f))
        od = json.loads(data['PriceList'][0])['terms']['OnDemand']
        id1 = list(od)[0]
        id2 = list(od[id1]['priceDimensions'])[0]
        return od[id1]['priceDimensions'][id2]['pricePerUnit']['USD']
```
However, and when I change ['OnDemand'] to ['spot'] (or ['Spot']) the code tells me that Spot is not a keyword. Is there any way to modify the function to gather the spot price? Thanks.

Brettski-AWS · Accepted Answer

Have you tried retrieving the [Spot price history](https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/ec2.html#EC2.Client.describe_spot_price_history)? Does that give you the information you require?

Steve Kinsman · Answer

I would print out "data" after calling get_products() so you can see the structure you're trying to navigate.  I think PriceList is a list of products, and you're only looking at the first element '[0]' of the list which I guess is an on-demand product?

Retrieving spot price with boto3

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