polar should be either True or False

Raise code

    def __new__(cls, sets, polar=False):
        if polar is False:
            return CartesianComplexRegion(sets)
        elif polar is True:
            return PolarComplexRegion(sets)
        else:
            raise ValueError("polar should be either True or False")

    @property
    def sets(self):
        """
        Return raw input sets to the self.

        Examples """