You must respond to the step 2 directive using the following XML format:
<response>
    <code>
        <line>All imports here</line>
        <line></line>
        <line>def function_name_here( df, arg1, arg2 ):</line>
        <line>    ...</line>
        <line>    ...</line>
        <line>    return solution</line>
    </code>
</response>

Take a deep breath and pause for a moment before you begin. Good luck!