Status: Accepted
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 3112 by [email protected]: Interval has non-Basic args
http://code.google.com/p/sympy/issues/detail?id=3112
Interval stores bools in its args, which causes problems such as:
In [1]: Interval(0, 1).free_symbols
---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
/home/ronan/dev/sympy/<ipython-input-1-b6834b9d186c> in <module>()
----> 1 Interval(0, 1).free_symbols
/home/ronan/dev/sympy/sympy/core/basic.pyc in free_symbols(self)
599 method."""
600 union = set.union
--> 601 return reduce(union, [arg.free_symbols for arg in
self.args], set())
602
603 def is_hypergeometric(self, k):
AttributeError: 'bool' object has no attribute 'free_symbols'
This is an instance of issue 2070, and issue 2531 isn't a real solution
as .left_open and .right_open don't actually have a symbolic interpretation.
One (not terribly clean) way of dealing with this would be to create 4
subclasses - one each combination of (left_open, right_open).
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