fractional times.  With unittest.

Somebody please backport to 2.5.

in HTMLParser.

using "python -m doctest [-v] filename ...".

"extending and embedding" tutorial.

sq_ass_slice instead of the sq_slice slot.

it.

We add some new rules that are required for preserving internal
invariants of types.

1.  If type (or a subclass of type) appears in bases, it must appear
    before any non-type bases.  If a non-type base (like a regular
    new-style class) occurred first, it could trick type into
    allocating the new class an __dict__ which must be impossible.

2. There are several checks that are made of bases when creating a
   type.  Those checks are now repeated when assigning to __bases__.
   We also add the restriction that assignment to __bases__ may not
   change the metaclass of the type.

Add new tests for these cases and for a few other oddball errors that
were no previously tested.  Remove a crasher test that was fixed.

Also some internal refactoring:  Extract the code to find the most
derived metaclass of a type and its bases.  It is now needed in two
places.  Rewrite the TypeError checks in test_descr to use doctest.
The tests now clearly show what exception they expect to see.

Note that ast.c still has a mix of tabs and spaces, because it
attempts to use four-space indents for more of the new code.

Reported by Mike Verdone.

are gone.

This duplicates the behavior whening normally printing exceptions.