Dear Chimera users,

I am trying to write a script to change the phi and psi angle of a peptide. I am trying to adapt the code from http://plato.cgl.ucsf.edu/pipermail/chimera-users/2005-September/000456.html . I am trying to invert the angles so I am multiplying the angles by -1. My code is 

import chimera

from chimera import selection, UserError, BondRot, replyobj

opened = chimera.openModels.open('fun.pdb')
mol = opened[0]
RES_LIST = mol.residues
for res in mol.residues:
      b = str(res.phi)
      if b != 'None':
           c = -1*float(b)
           atomsMap = res.atomsMap
           N = atomsMap['N'][0]
           CA = atomsMap['CA'][0]
           C = atomsMap['C'][0]
           CAmap = CA.bondsMap
           phiBond = CAmap[N]
           psiBond = CAmap[C]
           phiAnchor = N
           psiAnchor = CA
           phi = BondRot(phiBond)
           phi.setAngle(c, phiAnchor)

When I run this script i get the error 

phi.setAngle(c, phiAnchor)
AttributeError: '_molecule.BondRot' object has no attribute 'setAngle'

Can someone please help me with this?

Warm regards.

Amin.