Xah Lee wrote: > when i try to run the following program, Python complains about some > global name frozenset is not defined. Is set some new facility in > Python 2.4?
http://www.python.org/doc/2.3/whatsnew/ http://www.python.org/doc/2.4/whatsnew/whatsnew24.html You must be running 2.3. If you persist in running 2.3, put the following at the top of the file: import sys PY_VERSION = sys.version_info[:2] if PY_VERSION == (2,3): from sets import Set as set from sets import ImmutableSet as frozenset That will get Reinhold's gadget working under 2.3. The bearophile's function uses collections.deque which is built-in to 2.4. > it would be nice if the two working programs do not use some package. > This problem shouldn't need to. Look at the newsgroup again. By my count there are apparently-working versions from SIX people: Reinhold, bear.+, Brian Beck, David Eppstein, yourself, and me. Only David's uses stuff that's not in the Python 2.4 off-the-shelf distribution. -- http://mail.python.org/mailman/listinfo/python-list