@property
    def b_interval(self):
        b_interval = []
        for element in self.psets:
            b_interval.append(element.args[1])

        b_interval = Union(*b_interval)
        return b_interval
Return the union of intervals of `y` when, self is in
dataset/ETHPy150Open sympy/sympy/sympy/sets/fancysets.py/ComplexRegion.b_interval