.<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='width:50%'>2.7</td>
                <td>3.0</td>
            </tr>
            <tr>
                <td>
                <pre class='tty'>import wee