digraph ideal {

    rankdir = "LR"


    object [
        shape = none
        label = <<table border="0" cellspacing="0">
                    <tr><td><b>object</b></td></tr>
                    <tr><td port="w" border="1">weakrefs</td></tr>
                    <tr><td port="dv" border="1">dict or values</td></tr>
                    <tr><td border="1" >GC info 0</td></tr>
                    <tr><td border="1" >GC info 1</td></tr>
                    <tr><td port="r" border="1" >refcount</td></tr>
                    <tr><td port="h" border="1" >__class__</td></tr>
                </table>>
    ]

    values [
        shape = none
        label = <<table border="0" cellspacing="0">
                    <tr><td><b>values</b></td></tr>
                    <tr><td border="1">Insertion order</td></tr>
                    <tr><td port="0" border="1">values[0]</td></tr>
                    <tr><td border="1">values[1]</td></tr>
                    <tr><td border="1">...</td></tr>
                </table>>

    ]

    class [ 
        shape = none
        label = <<table border="0" cellspacing="0">
                    <tr><td><b>class</b></td></tr>
                    <tr><td port="head" bgcolor="lightgreen" border="1">...</td></tr>
                    <tr><td border="1" bgcolor="lightgreen">dict_offset</td></tr>
                    <tr><td border="1" bgcolor="lightgreen">...</td></tr>
                    <tr><td port="k" border="1" bgcolor="lightgreen">cached_keys</td></tr>
                </table>>
    ]

    keys [label = "dictionary keys"; fillcolor="lightgreen"; style="filled"]
    NULL [ label = " NULL"; shape="plain"]
    object:w ->  NULL
    object:h -> class:head
    object:dv -> values:0
    class:k -> keys

    oop [ label = "pointer"; shape="plain"]
    oop -> object:r
}