new_contents: #!/usr/bin/env python
  
  '''
  A simple example to run CAM-B3LYP TDDFT calculation.
  
  You need to switch to xcfun library if you found an error like
  NotImplementedError: libxc library does not support derivative order 2 for  camb3lyp
      This functional derivative is supported in the xcfun library.
      The following code can be used to change the libxc library to xcfun library:
  
          from pyscf.dft import xcfun
          mf._numint.libxc = xcfun
  '''
  
  import pyscf
  
  mol = pyscf.M(
      atom = 'H 0 0 0; F 0 0 1.1',
      basis = '6-31g(d,p)',
      symmetry = True,
  )
  
  mf = mol.RKS()
  mf.xc= 'camb3lyp'
  mf.run()
  
  # Note you need to switch to xcfun library for cam-b3lyp tddft
  mf._numint.libxc = pyscf.dft.xcfun
  mytd = mf.TDDFT()
  mytd.kernel()
  
subject: Add tddft example