Updates:
Labels: -NeedsBetterPatch NeedsReview
Comment #29 on issue 1778 by smichr: Rational from string can be improved
http://code.google.com/p/sympy/issues/detail?id=1778
Please see commit 1778 (the 2nd to the last) in my 1766 branch at github.
The big change to Rational is that all string handling except for real
literals is
handled in sympify. You can no longer do Rational('3/4') -- you can use
Rational(3,
4) or if you want to use the string, use sympify: S('3/4'). The thing about
S() is
that if it looks like a fraction you will get a fraction. If it doesn't
look like a
fraction but you want a fraction, use the 'q' flag: S('.3', q=1) -> 3/10
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