stylistic changes

  if ((angle < angle_cutoff or angle > 180.0 - angle_cutoff) and

      dist < dist_cutoff):

    return True

  else:

  return False

  if ((90.0 - angle_cutoff < angle < 90.0 + angle_cutoff) and

      dist < dist_cutoff):

    return True

  else:

  return False

  ligand_aromatic_rings = []

  for mol, ring_list in ((protein, protein_aromatic_rings),

                         (ligand, ligand_aromatic_rings)):

    aromatic_atoms = set(atom.GetIdx() for atom in mol.GetAromaticAtoms())

    aromatic_atoms = {atom.GetIdx() for atom in mol.GetAromaticAtoms()}

    for ring in Chem.GetSymmSSSR(mol):

      if set(ring).issubset(aromatic_atoms):

        ring_center = compute_ring_center(mol, ring)

          dist_cutoff=dist_cutoff):

        prot_to_update = set()

        lig_to_update = set()

        for i in prot_ring:

          for j in lig_ring:

            if (i, j) not in counted_pairs_parallel:

              prot_to_update.add(i)

              lig_to_update.add(j)

              counted_pairs_parallel.add((i, j))

        for prot_atom_idx in prot_ring:

          for lig_atom_idx in lig_ring:

            if (prot_atom_idx, lig_atom_idx) not in counted_pairs_parallel:

              prot_to_update.add(prot_atom_idx)

              lig_to_update.add(lig_atom_idx)

              counted_pairs_parallel.add((prot_atom_idx, lig_atom_idx))

        protein_pi_parallel.update(prot_to_update)

        ligand_pi_parallel.update(lig_to_update)

  if ((angle < angle_cutoff or angle > 180.0 - angle_cutoff) and

      (dist < dist_cutoff)):

    return True

  else:

  return False

  if np.abs(2.0 - np.abs(

      get_partial_charge(atom_i) - get_partial_charge(atom_j))) < 0.01:

    return True

  else:

  return False