@property
def rdm1(self):
    ' \n        Returns RMD1 if computed with compute_rdms function before\n        '
    if (self._rdm1 is not None):
        return self._rdm1
    else:
        print('1-RDM has not been computed. Return None for 1-RDM.')
        return None
Returns RMD1 if computed with compute_rdms function before
@property
def rdm1(self):
    ' \n        \n        '
    if (self._rdm1 is not None):
        return self._rdm1
    else:
        print('1-RDM has not been computed. Return None for 1-RDM.')
        return None