[Python-checkins] r58290 - peps/trunk/pep-3137.txt

[guido.van.rossum]

Author: guido.van.rossum
Date: Mon Oct  1 01:19:14 2007
New Revision: 58290

Modified:
   peps/trunk/pep-3137.txt
Log:
Changed my mind on comparing bytes to str.


Modified: peps/trunk/pep-3137.txt
==============================================================================
--- peps/trunk/pep-3137.txt	(original)
+++ peps/trunk/pep-3137.txt	Mon Oct  1 01:19:14 2007
@@ -8,7 +8,7 @@
 Content-Type: text/x-rst
 Created: 26-Sep-2007
 Python-Version: 3.0
-Post-History: 26-Sep-2007
+Post-History: 26-Sep-2007, 30-Sep-2007
 
 Introduction
 ============
@@ -124,8 +124,18 @@
 The bytes and buffer types are comparable with each other and
 orderable, so that e.g. b'abc' == buffer(b'abc') < b'abd'.
 
-Comparing either type to a str object raises an exception.  This
-turned out to be necessary to catch common mistakes.
+Comparing either type to a str object for equality returns False
+regardless of the contents of either operand.  Ordering comparisons
+with str raise TypeError.  This is all conformant to the standard
+rules for comparison and ordering between objects of incompatible
+types.
+
+(**Note:** in Python 3.0a1, comparing a bytes instance with a str
+instance would raise TypeError, on the premise that this would catch
+the occasional mistake quicker, especially in code ported from Python
+2.x.  However, a long discussion on the python-3000 list pointed out
+so many problems with this that it is clearly a bad idea, to be rolled
+back in 3.0a2 regardless of the fate of the rest of this PEP.)
 
 Slicing
 -------