[Python-checkins] peps: Minor clean up of PEP 520.

[eric.snow]

https://hg.python.org/peps/rev/ea566ba82216
changeset:   6355:ea566ba82216
user:        Eric Snow <ericsnowcurrently at gmail.com>
date:        Tue Jun 07 20:09:27 2016 -0700
summary:
  Minor clean up of PEP 520.

files:
  pep-0520.txt |  22 ++++++++++++----------
  1 files changed, 12 insertions(+), 10 deletions(-)


diff --git a/pep-0520.txt b/pep-0520.txt
--- a/pep-0520.txt
+++ b/pep-0520.txt
@@ -16,8 +16,9 @@
 
 This PEP changes the default class definition namespace to ``OrderedDict``.
 Furthermore, the order in which the attributes are defined in each class
-body will now be preserved in ``type.__definition_order__``.  This allows
-introspection of the original definition order, e.g. by class decorators.
+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``.
@@ -62,9 +63,9 @@
 
   1. if ``__definition_order__`` is defined in the class body then the
      value is used as-is, though the attribute will still be read-only
-  2. types that do not have a class definition (e.g. builtins) have
+  2. classes that do not have a class definition (e.g. builtins) have
      their ``__definition_order__`` set to ``None``
-  3. types for which `__prepare__()`` returned something other than
+  3. classes for which `__prepare__()`` returned something other than
      ``OrderedDict`` (or a subclass) have their ``__definition_order__``
      set to ``None`` (except where #1 applies)
 
@@ -78,8 +79,8 @@
        ham = None
        eggs = 5
        __definition_order__ = tuple(k for k in locals()
-                                    if (!k.startswith('__') or
-                                        !k.endswith('__')))
+                                    if (not k.startswith('__') or
+                                        not k.endswith('__')))
 
 Note that [pep487_] proposes a similar solution, albeit as part of a
 broader proposal.
@@ -169,14 +170,15 @@
 Alternatives
 ============
 
-type.__dict__ as OrderedDict
-----------------------------
+<class>.__dict__ as OrderedDict
+-------------------------------
 
 Instead of storing the definition order in ``__definition_order__``,
 the now-ordered definition namespace could be copied into a new
-``OrderedDict``.  This would mostly provide the same semantics.
+``OrderedDict``.  This would then be used as the mapping proxied as
+``__dict__``.  Doing so would mostly provide the same semantics.
 
-However, using ``OrderedDict`` for ``type,__dict__`` would obscure the
+However, using ``OrderedDict`` for ``__dict__`` would obscure the
 relationship with the definition namespace, making it less useful.
 Additionally, doing this would require significant changes to the
 semantics of the concrete ``dict`` C-API.

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