Document vars behavior when __dict__ is missing (GH-21466) (GH-21939)

miss-islington · andresdelfino · web-flow · commit d7cd1164c18d · 2020-08-22T15:55:00.000-03:00
(cherry picked from commit 802726a) Co-authored-by: Andre Delfino <adelfino@gmail.com>
diff --git a/Doc/library/functions.rst b/Doc/library/functions.rst
@@ -1720,6 +1720,9 @@ are always available.  They are listed here in alphabetical order.
    locals dictionary is only useful for reads since updates to the locals
    dictionary are ignored.
 
+   A :exc:`TypeError` exception is raised if an object is specified but
+   it doesn't have a :attr:`~object.__dict__` attribute (for example, if
+   its class defines the :attr:`~object.__slots__` attribute).
 
 .. function:: zip(*iterables)
 
