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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 ping(dest_ip=None, **kwargs):
    '''
    Send a ping RPC to a device

    dest_ip
      The IP of the device to ping

    dev_timeout : 30
        The NETCONF RPC timeout (in seconds)

    rapid : False
        When ``True``, executes ping at 100pps instead of 1pps

    ttl
        Maximum number of IP routers (IP hops) allowed between source and
        destination

    routing_instance
      Name of the routing instance to use to send the ping

    interface
      Interface used to send traffic

    count : 5
      Number of packets to send

    CLI Examples:

    .. code-block:: bash

        salt 'device_name' junos.ping '8.8.8.8' count=5
        salt 'device_name' junos.ping '8.8.8.8' ttl=1 rapid=True
    '''
    conn = __proxy__['junos.conn']()
    ret = {}

    if dest_ip is None:
        ret['message'] = 'Please specify the destination ip to ping.'
        ret['out'] = False
        return ret

    op = {'host': dest_ip}
    if '__pub_arg' in kwargs:
        if kwargs['__pub_arg']:
            if isinstance(kwargs['__pub_arg'][-1], dict):
                op.update(kwargs['__pub_arg'][-1])
    else:
        op.update(kwargs)

    op['count'] = six.text_type(op.pop('count', 5))
    if 'ttl' in op:
        op['ttl'] = six.text_type(op['ttl'])

    ret['out'] = True
    try:
        ret['message'] = jxmlease.parse(etree.tostring(conn.rpc.ping(**op)))
    except Exception as exception:
        ret['message'] = 'Execution failed due to "{0}"'.format(exception)
        ret['out'] = False
    return ret