Updates:
        Labels: -NeedsBetterPatch NeedsReview

Comment #34 on issue 1778 by smichr: Rational from string can be improved
http://code.google.com/p/sympy/issues/detail?id=1778

I've implemented the rational=False flag on nsimplify and renamed rsimplify to
_real_to_rational and added a doctest.

an attempt to use fractions to convert string input is now provided along with a limit_denominator option. It works a little better than fractions in that if spaces appear around the operator it still works as in python i.e., Rational("3 / 4") is ok.

the processing of list et al is already embedded in sympy. I put the dict option as a
new issue.

32c can be someone else's project.

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