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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def list_nodes(profile, **libcloud_kwargs):
    '''
    Return a list of nodes

    :param profile: The profile key
    :type  profile: ``str``

    :param libcloud_kwargs: Extra arguments for the driver's list_nodes method
    :type  libcloud_kwargs: ``dict``

    CLI Example:

    .. code-block:: bash

        salt myminion libcloud_compute.list_nodes profile1
    '''
    conn = _get_driver(profile=profile)
    libcloud_kwargs = salt.utils.args.clean_kwargs(**libcloud_kwargs)
    nodes = conn.list_nodes(**libcloud_kwargs)
    ret = []
    for node in nodes:
        ret.append(_simple_node(node))
    return ret