code: def real_variable_name(self):
      return (
          self.real_name.replace("/", "_")
          .replace("-", "_")
          .replace("[", "_")
          .replace("]", "_")
      )
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import collections
label_desc: Use image node_id 4 for calling the GraphNode obj's underlying member method code with example usage: obj.real_variable_name() and returns: self