code: def write_points(self, fid):
          
          for nr, point in enumerate(self.Points):
              fid.write(
                  'Point({0}) = {{{1}, {2}, 0, {3}}};\n'.format(
                      nr + 1, point[0], point[1], self.Charlengths[nr]))
docs: Write the grid points to the GMSH-command file.
  
          Parameters
          ----------
          fid: file object for the command file (.geo)