code: def _define_ref(self, name, load=None):
      ident = "l_%d_%s" % (self.level, name)
      self.refs[name] = ident
      if load is not None:
          self.loads[ident] = load
      return ident
  
imports: from ._compat import iteritems
  from .visitor import NodeVisitor
label_desc: Use image node_id 3 for calling the Symbols obj's underlying member method code with example usage: obj._define_ref(name, load) and returns: ident