Comment #42 on issue 1778 by smichr: Rational from string can be improved
http://code.google.com/p/sympy/issues/detail?id=1778
I believe this is ready for final review. It already had +1 from Ondrej and
Vinzent and I think I've addressed Ronan's concerns.
It and 1914 are included in branch 1788 at github/smichr/t2. With this in
place one will be able to
1) solve equations like 0.1*x + 2 = 0 by using nsimplify on the expression
(perhaps something that can be done internally in solve)
2) obtain fractions instead of 0L from rationals involving longs
3) type negatives as you see them and not worry about changing them to +
when two appear in a row, so S('3--3') will give 6.
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