class_docstr: Gather all identifiers used throughout a node.
code: def __init__(self):
      self.result = set()
      super(Identifiers, self).__init__()
  
imports: from pythran.passmanager import NodeAnalysis
label_desc: Use image node_id 1 to create a new Identifiers object from inherited base classes: NodeAnalysis with example: obj = Identifiers()