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Based on AWS TimeStream SDK documentation for Python, I have the following code:

import boto3

def list_databases(self):
        print("Listing databases")
        try:
            result = self.client.list_databases(MaxResults=5)
            self._print_databases(result['Databases'])
            next_token = result.get('NextToken', None)
            while next_token:
                result = self.client.list_databases(NextToken=next_token, MaxResults=5)
                self._print_databases(result['Databases'])
                next_token = result.get('NextToken', None)
        except Exception as err:
            print("List databases failed:", err)

session = boto3.Session(profile_name='superuser', region_name='eu-west-1')
query_client = session.client('timestream-query')

list_databases(query_client)

The authentication for my user superuser seems to work fine, but the boto3 session used for my query_client does not have a client object:

Listing databases
List databases failed: 'TimestreamQuery' object has no attribute 'client'

What am I missing?

Svend
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Nakrule
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1 Answers1

1

This argument name in this method is likely a mistake:

# this name is discouraged in non-OO code:
def list_databases(self):

self is typically used in object oriented python code, which is not the case here.

Rename it as follows:

# this is better:
def list_databases(client):

Then, remove any mention of self in the body of the function, for example:

# this is incorrect:
result = self.client.list_databases(MaxResults=5)

should be:

# this should work:
result = client.list_databases(MaxResults=5)
Svend
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  • You are correct, thank you very much. It's strange that the function was wrong because this comes directly from the AWS documentation: https://docs.aws.amazon.com/timestream/latest/developerguide/code-samples.list-db.html – Nakrule Feb 08 '21 at 13:38
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    Cool, glad to hear it now works. Indeed that documentation is misleading. I guess they meant to suggest to put that method inside a python class, although that is not explicitly mentioned anywhere. – Svend Feb 08 '21 at 13:46