tree 0d734e3a3e02c57255d24a8458d53fc02da9d677
parent e295676c87d0a27ca4798a1d817ede88cc860586
author Raymond Hettinger <python@rcn.com> 1122932369 +0000
committer Raymond Hettinger <python@rcn.com> 1122932369 +0000
HG:extra convert_revision:svn%3A6015fed2-1504-0410-9fe1-9d1591cc4771/python/branches/legacy-trunk%4039238

* Improve code for the empty frozenset singleton:
  - Handle both frozenset() and frozenset([]).
  - Do not use singleton for frozenset subclasses.
  - Finalize the singleton.
  - Add test cases.
* Factor-out set_update_internal() from set_update().  Simplifies the
  code for several internal callers.
* Factor constant expressions out of loop in set_merge_internal().
* Minor comment touch-ups.