exercise: partition a list by equivalence
John Machin
sjmachin at lexicon.net
Sun Feb 20 05:29:33 EST 2005
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.
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