Issue 1189: Sum uses __str__ when doing direct finite sums
http://code.google.com/p/sympy/issues/detail?id=1189
New issue report by ellisonbg.net:
class MyBasic(Basic):
def __new__(cls, k):
obj = Basic.__new__(cls, sympify(k), commutative=False)
return obj
def _eval_subs(self, old, new):
r = self.__class__(self.args[0].subs(old, new))
return r
def __str__(self):
return "hi there" % self.args[0]
In [33]: s = Sum(MyBasic(n)*MyBasic(n)*2,(n,0,4))
In [34]: s.doit()
Out[34]:
2 2 2 2 2
2⋅hi there + 2⋅hi there + 2⋅hi there + 2⋅hi there + 2⋅hi there
Issue attributes:
Status: New
Owner: ----
Labels: Type-Defect Priority-Medium
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