docstr: Convenience function to get the x_label of a value index
docstr_tok: ["Convenience","function","to","get","the","x_label","of","a","value","index"]
code: def _get_x_label(self, i):
      """Convenience function to get the x_label of a value index"""
      return
  
imports: from pygal.graph.graph import Graph
  from pygal.util import compute_scale, cut
label_desc: Use image node_id 4 for calling the Dual obj's underlying member method code with example usage: obj._get_x_label(i) without return types