Updates:
Status: NeedsDecision
Labels: Milestone-Release0.7.0
Comment #1 on issue 2406 by [email protected]: improve Tuple constructor
http://code.google.com/p/sympy/issues/detail?id=2406
We should try to resolve this before the release, because it would be too
much of a compatibility break if we do it afterwards.
+1 on your first item. Tuple(x, 1).subs(x, 0) should just work, and
instances of Basic are supposed to have only instances of Basic in
their .args.
The second point was already discussed (in issue 1920 and elsewhere, IIRC,
but I can't find it ATM). The main problem is that instances of Basic are
expected to obey expr.__class__(*expr.args) == expr, and your suggestion
would break it. My counter-proposition would be to add a from_iter()
classmethod to Basic that does cls.from_iter(seq) := cls(*seq) and sympify
lists and tuples as Tuples, so that S(some_list) ==
Tuple.from_iter(some_list).
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