def print_diff(self, ignore=[]):
        """Print the diff to the last time the state of objects was measured.

        keyword arguments
        ignore -- list of objects to ignore
        """
        # ignore this and the caller frame
        ignore.append(inspect.currentframe()) #PYCHOK change ignore
        diff = self.get_diff(ignore)
        print("Added objects:")
        summary.print_(summary.summarize(diff['+']))
        print("Removed objects:")
        summary.print_(summary.summarize(diff['-']))
        # manual cleanup, see comment above
        del ignore[:]
Print the diff to the last time the state of objects was measured.

        keyword arguments
        ignore -- list of objects to ignore