How do I get the pricing data for EC2 in the Python SDK? (New to python)

Question

I'm new to python so please bear with me. I'm following the layout of the data in this link:

https://aws.amazon.com/blogs/aws/aws-price-list-api-update-new-query-and-metadata-functions/

and this is the relevant code:
          
```
  for price in responsee['PriceList']:
                price_dict = json.loads(price)
                product = price_dict['product']
                attributes = product['attributes']
                terms = price_dict['terms']
                on_demand_terms = terms['OnDemand']
                for dimension in on_demand_terms:
                    pricedimension = dimension['priceDimension']
                    for y in pricedimension:
                        if vcpu == attributes['vcpu']:
                            finalprice = y['pricePerUnit']['USD']
                            print(finalprice)
```

and the error message I generally get is this:

```
    pricedimension = dimension['priceDimension'] 
                     ~~~~~~~~~^^^^^^^^^^^^^^^^^^ 
TypeError: string indices must be integers, not 'str
```
I've tried everything I could think of but I can't figure out how to get to "priceperUnit". that's basically what I'm trying to do. I don't know how to get thru the last layers in the data. 
```
'terms': {'OnDemand': {'24GRA8RB2KZ9NPCS.JRTCKXETXF': {'effectiveDate': '2017-09-01T00:00:00Z',
                                                        'offerTermCode': 'JRTCKXETXF',
                                                        'priceDimensions': {'24GRA8RB2KZ9NPCS.JRTCKXETXF.6YS6EN2CT7':
```
just to be clear, what I'm trying to get through with "dimension" is the key after OnDemand that starts with "24GRA". it is apparently a string and is not being registered as a dictionary, it is not fetching the other values when I try to use the dictionary route.
also, is this really grabbing all the products for ec2? the list seems a little short. there are hundreds of instances for ec2, but this seems to only be grabbing one price? I apologize as I am new to python. I've been doing this for about a year now.
Please advise.

Answer

To get the key right after 'OnDemand' beginning with '24GR', you can do:

for price in responsee['PriceList']:
                price_dict = json.loads(price)
                product = price_dict['product']
                attributes = product['attributes']
                terms = price_dict['terms']
				
		key = terms['OnDemand']
		key = str(key)
		key = key.split(str("'"),1)[1]
		key = key.split(str("'"),1)[0]

How do I get the pricing data for EC2 in the Python SDK? (New to python)

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