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Calculating phi and psi angles for a pdb file

I am trying to calculate the phi and psi angles for a PDB file. I know ProDy has a code that helps guide through the process. BioPython has pre-built functions that do the same, but you have to consider glycine, proline, and residues before proline. Does anyone know if Prody considers that, or should I include those parameters? I basically want to parse through the PDB file and calculate the phi and psi angles residue by residue. I did get the BioPython code from another source, and my output is only one chain.

proteins

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