Antoine Pitrou <pit...@free.fr> added the comment: `instance` means it is an instance of an old-style class. Old-style classes are classes which don't have `object` in their inheritance hierarchy. On the other hand, for instance new-style classes type() returns the actual class. Bottom line: this is by design. Of course in an ideal world (or in Python 3) there are only new-style classes, but we had to maintain compatibility, and that's why there are two slightly different object models cohabiting in Python 2.x.
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