Updates:
Status: Accepted
Blockedon: 2832
Comment #1 on issue 2960 by asmeu...@gmail.com: It right 0 < x < 1 ?
http://code.google.com/p/sympy/issues/detail?id=2960
Python evaluates "a < b < c" as "a < b and b < c". There's no way to
override this to return a more advanced symbolic object (that would require
http://www.python.org/dev/peps/pep-0335/). This evaluates both sides as a
boolean, which presently, for relationals, gives True or False almost
randomly for anything that isn't automatically evaluated.
This should be fixed by issue 2832, which would cause a boolean evaluation
of a relational to raise ValueError. Then, those would both raise
ValueError.
For now, avoid doing multiple inequality comparisons unless you know that
each one will evaluate to True or False automatically.
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