code: def iterative_symmetrize(mol, max_n=10, tolerance=0.3, epsilon=1e-2):
      
      new = mol
      n = 0
      finished = False
      while not finished and n <= max_n:
          previous = new
          PA = PointGroupAnalyzer(previous, tolerance=tolerance)
          eq = PA.symmetrize_molecule()
          new = eq['sym_mol']
          finished = np.allclose(new.cart_coords, previous.cart_coords,
                                 atol=epsilon)
          n += 1
      return eq
docs: Returns a symmetrized molecule
  
      The equivalent atoms obtained via
      :meth:`~pymatgen.symmetry.analyzer.PointGroupAnalyzer.get_equivalent_atoms`
      are rotated, mirrored... unto one position.
      Then the average position is calculated.
      The average position is rotated, mirrored... back with the inverse
      of the previous symmetry operations, which gives the
      symmetrized molecule
  
      Args:
          mol (Molecule): A pymatgen Molecule instance.
          max_n (int): Maximum number of iterations.
          tolerance (float): Tolerance for detecting symmetry.
              Gets passed as Argument into
              :class:`~pymatgen.analyzer.symmetry.PointGroupAnalyzer`.
          epsilon (float): If the elementwise absolute difference of two
              subsequently symmetrized structures is smaller epsilon,
              the iteration stops before ``max_n`` is reached.
  
  
      Returns:
          dict: The returned dictionary has three possible keys:
  
          ``sym_mol``:
          A symmetrized molecule instance.
  
          ``eq_sets``:
          A dictionary of indices mapping to sets of indices,
          each key maps to indices of all equivalent atoms.
          The keys are guaranteed to be not equivalent.
  
          ``sym_ops``:
          Twofold nested dictionary.
          ``operations[i][j]`` gives the symmetry operation
          that maps atom ``i`` unto ``j``.