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Question #224154 on UFL changed:
https://answers.launchpad.net/ufl/+question/224154
Status: Open => Answered
Martin Sandve Alnæs proposed the following answer:
and/or is not possible because of how they work in python.
&/| is bug prone because of their precedence level (see below).
UFL uses And(a,b) and Or(a,b) instead.
In [1]: from ufl import *
In [2]: x = triangle.x[0]
In [4]: x < 3 & x > 2
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-4-1442b929afd2> in <module>()
----> 1 x < 3 & x > 2
TypeError: unsupported operand type(s) for &: 'int' and 'Indexed'
In [5]: And(x < 3, x > 2)
Out[5]: AndCondition(...)
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