Improvements to set.py:

* Relaxed the argument restrictions for non-operator methods.  They now
  allow any iterable instead of requiring a set.  This makes the module
  a little easier to use and paves the way for an efficient C
  implementation which can take better advantage of iterable arguments
  while screening out immutables.

* Deprecated Set.update() because it now duplicates Set.union_update()

* Adapted the tests and docs to include the above changes.

* Added more test coverage including testing identities and checking
  to make sure non-restartable generators work as arguments.

Will backport to Py2.3.1 so that the interface remains consistent
across versions.  The deprecation of update() will be changed to
a FutureWarning.

1 files changed, 4 insertions, 1 deletions

diff --git a/Misc/NEWS b/Misc/NEWS
index a3a62be..8f24d85 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -30,7 +30,10 @@ Extension modules
 Library
 -------
 
-- sets.py now runs under Py2.2
+- sets.py now runs under Py2.2.  In addition, the argument restrictions
+  for most set methods (but not the operators) have been relaxed to
+  allow any iterable.  Also the Set.update() has been deprecated because
+  it duplicates Set.union_update().
 
 - random.seed() with no arguments or None uses time.time() as a default
   seed.  Modified to match Py2.2 behavior and use fractional seconds so