Note your comment:

sql="select * from testnn" # testnn is empty

Note the error:

apsw.ExecutionCompleteError: Can't get description for statements that
have completed execution

The statement ran to completion. Asking what the columns are afterwards can't be done because it is complete.

Am I doing something wrong here?  I'm expecting a description even
though the table is empty because the full_column_names pragma is on.

The pragma has nothing to do with it. There is no description for an empty result set because the result set is empty.

Roger

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