Merge 3.6

Doc/reference/datamodel.rst

@@ -1338,11 +1338,14 @@ Basic customization
 
    Called by built-in function :func:`hash` and for operations on members of
    hashed collections including :class:`set`, :class:`frozenset`, and
-   :class:`dict`.  :meth:`__hash__` should return an integer.  The only
-   required property is that objects which compare equal have the same hash
-   value; it is advised to somehow mix together (e.g. using exclusive or) the
-   hash values for the components of the object that also play a part in
-   comparison of objects.
+   :class:`dict`.  :meth:`__hash__` should return an integer. The only required
+   property is that objects which compare equal have the same hash value; it is
+   advised to mix together the hash values of the components of the object that
+   also play a part in comparison of objects by packing them into a tuple and
+   hashing the tuple. Example::
+
+       def __hash__(self):
+           return hash((self.name, self.nick, self.color))
 
    .. note::