title: open .db-file from python script returns empty file
body: <p>I want to open a .db-file from python to inspect it. I can open it from a terminal,</p>
  <pre><code>    % sqlite3 scrapy_quotes.db
      sqlite&gt; .tables
      author     quote      quote_tag  tag      
      sqlite&gt; select * from quote limit 3
      ...
  </code></pre>
  <p>but from a python-script it only shows an empty file,</p>
  <pre><code>    from sqlalchemy import create_engine, inspect
      engine = create_engine('sqlite:///scrapy_quotes.db')
      insp = inspect(engine)
      print(insp.get_table_names())
      []
  </code></pre>
  <p>while this script does work for another .db-file.</p>
  <pre><code>    from sqlalchemy import create_engine, inspect
      engine = create_engine('sqlite:///chinook.db')
      insp = inspect(engine)
      print(insp.get_table_names())
      ['albums', 'artists', 'customers', 'employees', 'genres',                 
      'invoice_items', 'invoices', 'media_types', 
      'playlist_track', 'playlists', 'sqlite_sequence', 
      'sqlite_stat1', 'tracks']
  </code></pre>
  <p>What is going on?</p>