tp_base, ob_type, and tp_bases

[Terry Reedy]

Martin v. Löwis wrote:
>> So, the documentation states that ob_type is a pointer to the type's

>> Next, we have tp_base.  That's defined as "an optional pointer to a
>> base type from which type properties are inherited."  The value of
>> tp_base is then added to the tp_bases tuple.  This is confusing me. On
>> the surface, it sound as though they're one in the same?
> 
> (I don't understand the English "one in the same" - interpreting it
> as "as though they should be the same")

Martin, you are not alone! I do not really understand that either.