docs: def get_pp_name(self):
          '''Determine the pseudopotential names from the output'''
          ppnames = []
          # Find the number of atom types
          natomtypes = int(self._get_line('number of atomic types', self.outputf).split()[5])
          # Find the pseudopotential names
          with open(self.outputf) as fp:
              for line in fp:
                  if "PseudoPot. #" in line:
                      ppnames.append(Scalar(value=next(fp).split('/')[-1].rstrip()))
                      if len(ppnames) == natomtypes:
                          return Value(scalars=ppnames)
              raise Exception('Could not find %i pseudopotential names'%natomtypes)