Comment #2 on issue 2626 by asmeurer: Piecewise should use a different
syntax for "otherwise"
http://code.google.com/p/sympy/issues/detail?id=2626
Would it ever make sense for Piecewise to hold Tuples? If so, then we have
to wrap the last condition around a tuple. Otherwise, there is no way to
differentiate between
Piecewise(Tuple(some_Tuple, cond), ..., otherwise_Tuple) # Returns a Tuple
for the otherwise condition
and
Piecewise(Tuple(some_Tuple, cond), ..., otherwise_Tuple) # otherwise_Tuple
is interpreted as an expr, cond pair.
Does that make sense?
Perhaps this should never be allowed, as Tuple is not really a mathematical
object, so shouldn't be inside a Piecewise. I do agree that just having it
as the last object would be cleaner. I don't like the idea of having some
Otherwise singleton that the user has to import and we have to maintain
just to accomodate Piecewise (unless you see other uses for it).
So I'm actually +1 for either Piecewise(..., otherwise_expr) or
Piecewise(..., (otherwise_expr,)). We just need to change it from the way
that it is now.
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