Comment #9 on issue 2406 by [email protected]: improve Tuple constructor
http://code.google.com/p/sympy/issues/detail?id=2406
So for now we are:
1. sympifying arguments to Tuple
2. sympify(tuple()) -> Tuple()
3. adding method fromiter() to Tuple()
4. keep Tuple([x, y, z]) -> Tuple([x, y, z]) -- in fact, it'll be
Tuple(Tuple(x, y, z))
In case in the future we change the invariant to expr.fromiter(expr.args),
we have to implement fromiter() in Basic also. Is that correct?
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