class_docstr: Yields the set of pure functions
code: def __init__(self):
      self.result = set()
      super(PureFunctions, self).__init__(
          ArgumentEffects, GlobalEffects
      )
  
imports: from pythran.analyses.argument_effects import ArgumentEffects
  from pythran.analyses.global_effects import GlobalEffects
  from pythran.passmanager import ModuleAnalysis
label_desc: Use image node_id 1 to create a new PureFunctions object from inherited base classes: ModuleAnalysis with example: obj = PureFunctions()