[Python-checkins] r54612 - sandbox/trunk/abc/abc.py

Fri Mar 30 02:49:46 CEST 2007

Author: guido.van.rossum
Date: Fri Mar 30 02:49:45 2007
New Revision: 54612
Modified:
 sandbox/trunk/abc/abc.py
Log:
Add Sizeable base class and comparisons to Sequence.
(Do we need ABCs to indicate comparability?)
Modified: sandbox/trunk/abc/abc.py
==============================================================================

--- sandbox/trunk/abc/abc.py	(original)
+++ sandbox/trunk/abc/abc.py	Fri Mar 30 02:49:45 2007
@@ -322,7 +322,7 @@
 ### SEQUENCES ###
 
 
-class Sequence(Iterable):
+class Sequence(Sizeable, Iterable):
 
 """A minimal sequence.
 
@@ -406,3 +406,32 @@
 return NotImplemented
 repeat = self.__index(repeat)
 return self.__class__(elem for i in range(repeat) for elem in self)
+
+ def __eq__(self, other):
+ if not isinstance(other, Sequence):
+ return NotImplemented
+ if len(self) != len(other):
+ return False
+ for a, b in zip(self, other):
+ if a == b:
+ continue
+ return False
+ return len(self) == len(other)
+
+ def __lt__(self, other):
+ if not isinstance(other, Sequence):
+ return NotImplemented
+ for a, b in zip(self, other):
+ if a == b:
+ continue
+ return a < b
+ return len(self) < len(other)
+
+ def __le__(self, other):
+ if not isinstance(other, Sequence):
+ return NotImplemented
+ for a, b in zip(self, other):
+ if a == b:
+ continue
+ return a < b
+ return len(self) <= len(other)
