ion</span>):
    ...</pre>
            </td>
            <td>
                <pre class='tty'>import weewx.<span class="changed">drivers</span>
    
class ACME960(weewx.<span class="changed">drivers.AbstractDevice</span>):
    ...</pre>
            </td>
        </tr>
    </table>
    
    <h3>Service APIs</h3>
    
    <p>The base class for services has moved.</p>
    
    <p>This affects only those who have written custom services.</p>
    <table>
        <tr class="first_row">
            <td style='wid