[Python-checkins] peps: Clarify the distinction between the definition ns and __dict__.

[eric.snow]

https://hg.python.org/peps/rev/b72a8581978c
changeset:   6368:b72a8581978c
user:        Eric Snow <ericsnowcurrently at gmail.com>
date:        Sat Jun 11 19:42:03 2016 -0600
summary:
  Clarify the distinction between the definition ns and __dict__.

files:
  pep-0520.txt |  10 +++++++---
  1 files changed, 7 insertions(+), 3 deletions(-)


diff --git a/pep-0520.txt b/pep-0520.txt
--- a/pep-0520.txt
+++ b/pep-0520.txt
@@ -14,15 +14,19 @@
 Abstract
 ========
 
+When a class is defined using a ``class`` statement, the class body is
+executed within a namespace.  After the execution completes, that
+namespace is copied into new ``dict`` and the original definition
+namespace is discarded.  The new copy is stored away as the class's
+namespace and is exposed as ``__dict__`` through a read-only proxy.
+
 This PEP changes the default class definition namespace to ``OrderedDict``.
+The long-lived class namespace (``__dict__``) will remain a ``dict``.
 Furthermore, the order in which the attributes are defined in each class
 body will now be preserved in the ``__definition_order__`` attribute of
 the class.  This allows introspection of the original definition order,
 e.g. by class decorators.
 
-Note: just to be clear, this PEP is *not* about changing ``__dict__`` for
-classes to ``OrderedDict``.
-
 
 Motivation
 ==========

-- 
Repository URL: https://hg.python.org/peps