create your own weak references directly. The low-level machinery is
exposed by the :mod:`weakref` module for the benefit of advanced uses.
-Not all objects can be weakly referenced; those objects which can include class
-instances, functions written in Python (but not in C), instance methods, sets,
-frozensets, some :term:`file objects <file object>`, :term:`generators <generator>`,
+Not all objects can be weakly referenced. Objects which support weak references
+include class instances, functions written in Python (but not in C), instance methods,
+sets, frozensets, some :term:`file objects <file object>`, :term:`generators <generator>`,
type objects, sockets, arrays, deques, regular expression pattern objects, and code
objects.