I'm sorry, I know I'm somewhat late to the party, and replying at this
position in the thread is rather arbitrary, but how about the following:
1) don't sort .args at creation time (ronan has made good arguments for
this, imho)
2) add a property .sorted_args to FiniteSet
This could just return sorted(self.args, key=whatever) for now.
3) Anywhere you need sorted arguments (for example in the sort key, and
for printing), use .sorted_args. Else use .args.
4) If we experience major slowdown in some use of .sorted_args,
investigate if manual caching yields improvement.
5) PROFIT
As an expansion of step 4, most of which has already been said
elsewhere: Since sympy objects are inherently immutable, the cache can
be as dumb as using a self._sorted_args member which is initially set to
None. The only problem I see with this is that myset.class(*myset.args)
will clear the cache. Not sure how much of an issue that is.
Tom
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