def __str__(self):
    result = 'Active Space Data:\n'
    result += '{key:15} : {value:15} \n'.format(key='active_orbitals', value=str(self.active_orbitals))
    result += '{key:15} : {value:15} \n'.format(key='reference_orbitals', value=str(self.reference_orbitals))
    result += '{key:15} : {value:15} \n'.format(key='frozen_docc', value=str(self.frozen_docc))
    result += '{key:15} : {value:15} \n'.format(key='frozen_uocc', value=str(self.frozen_uocc))
    return result
def __str__(self):
    result = 'Active Space Data:\n'
    result += '{key:15} : {value:15} \n'.format(key='active_orbitals', value=str(self.active_orbitals))
    result += '{key:15} : {value:15} \n'.format(key='reference_orbitals', value=str(self.reference_orbitals))
    result += '{key:15} : {value:15} \n'.format(key='frozen_docc', value=str(self.frozen_docc))
    result += '{key:15} : {value:15} \n'.format(key='frozen_uocc', value=str(self.frozen_uocc))
    return result