@property
def n_orbitals(self) -> int:
    ' '
    if (self.active_space is None):
        return self.molecule.n_orbitals
    else:
        return len(self.active_space.active_orbitals)
@property
def n_orbitals(self) -> int:
    ' '
    if (self.active_space is None):
        return self.molecule.n_orbitals
    else:
        return len(self.active_space.active_orbitals)