In particular, the metaclass :class:`abc.ABCMeta` implements these methods in
order to allow the addition of Abstract Base Classes (ABCs) as "virtual base
-classes" to any class or type (including built-in types), and including to other
+classes" to any class or type (including built-in types), including other
ABCs.
.. method:: class.__instancecheck__(self, instance)
Note that these methods are looked up on the type (metaclass) of a class. They
cannot be defined as class methods in the actual class. This is consistent with
-the lookup of special methods that are called on instances, only that in this
+the lookup of special methods that are called on instances, only in this
case the instance is itself a class.
.. seealso::