Comment #1 on issue 3046 by smi...@gmail.com: divmod method needed for
Rational
http://code.google.com/p/sympy/issues/detail?id=3046
https://github.com/sympy/sympy/pull/1054
When divmod(2, S(3)) is called, Python passes the call off to
Integer.__rdivmod__ because S(3) is an Integer. The arguments __rdivmod__
receives are rdivmod(S(3), 2) -- note the reversal of arguments relative to
the first call. Since there was no __rdivmod__ for anything but Integer,
any call to divmod with python number first failed; since there was no
__divmod__ written for anything but Integer, a call to divmod with the
first argument anything but an Integer failed.
__rdivmod__ and __divmod__ are now defined in Number so Rationals and
Floats now work, too. The Integer versions of __rdivmod__ and __divmod__
were left in place since they are about 2X faster.
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