code: def _skip_frame(self):
          
          self._get_line()
          num_atoms = int(self._get_line())
          if self.num_atoms is not None and self.num_atoms != num_atoms:
              raise ValueError("The number of atoms must be the same over the entire file.")
          for i in range(num_atoms+1):
              self._get_line()
docs: Skip one frame