code: def gather(self, analysis, node):
          "High-level function to call an `analysis' on a `node'"
          assert issubclass(analysis, Analysis)
          a = analysis()
          a.attach(self)
          return a.run(nodef gather(self, analysis, node):
          "High-level function to call an `analysis' on a `node'"
          assert issubclass(analysis, Analysis)
          a = analysis()
          a.attach(self)
          return a.run(node)
docs: High-level function to call an `analysis' on a `node