code: def get_diff(self, ignore=[]):
          
          # ignore this and the caller frame
          ignore.append(inspect.currentframe()) #PYCHOK change ignore
          self.o1 = self._get_objects(ignore)
          diff = muppy.get_diff(self.o0, self.o1)
          self.o0 = self.o1
          # manual cleanup, see comment above
          del ignore[:] #PYCHOK change ignore
          return diff
docs: Get the diff to the last time the  state of objects was measured.
  
          keyword arguments
          ignore -- list of objects to ignore