[Python-checkins] python/nondist/peps pep-0322.txt,1.10,1.11

Sun Nov 2 02:12:06 EST 2003

Update of /cvsroot/python/python/nondist/peps
In directory sc8-pr-cvs1:/tmp/cvs-serv16525
Modified Files:
	pep-0322.txt 
Log Message:
Three PEP updates:
* Correct the pure python implementation.
* Link to an implementation patch on SF.
* Remove the proposed application of __reverse__ to enumerate().
Index: pep-0322.txt
===================================================================
RCS file: /cvsroot/python/python/nondist/peps/pep-0322.txt,v
retrieving revision 1.10
retrieving revision 1.11
diff -C2 -d -r1.10 -r1.11
*** pep-0322.txt	30 Oct 2003 07:41:20 -0000	1.10
--- pep-0322.txt	2 Nov 2003 07:12:04 -0000	1.11
***************
*** 68,76 ****
 
 def reversed(x):
! try:
! return x.__reversed__()
! except AttributeError:
! pass
! if hasattr(x, "has_key"):
 raise ValueError("mappings do not support reverse iteration")
 i = len(x)
--- 68,75 ----
 
 def reversed(x):
! if hasattr(x, 'reversed'):
! for elem x.__reversed__():
! 		yield x
! if hasattr(x, 'keys'):
 raise ValueError("mappings do not support reverse iteration")
 i = len(x)
***************
*** 82,85 ****
--- 81,86 ----
 compatible.
 
+ A C implementation and unit tests are at: http://www.python.org/sf/834422
+ 
 
 Alternative Method Names
***************
*** 102,111 ****
 __getitem__() and __len__() but still have some useful way of
 providing reverse iteration.
- 
- For example, using this protocol, *enumerate()* can be extended to 
- support reversal whenever the underlying iterator supports it also::
- 
- >>> list(reversed(enumerate("abc")))
- [(2, 'c'), (1, 'b'), (0, 'a')]
 
 
--- 103,106 ----