code: def format_output(self, child_key):
          
          data = [x.stats.get(child_key, [0, 0, 0, 0, {}]) for x in self.stats1]
          return (map(self.color_string, islice(zip(*data), 1, 4)))
docs: Formats the data.
  
          self.stats1 contains a list of one or two pstat.Stats() instances, with
          the first being the current run and the second, the saved run, if it
          exists.  Each Stats instance is a dictionary mapping a function to
          5 data points - cumulative calls, number of calls, total time,
          cumulative time, and callers.
  
          format_output() converts the number of calls, total time, and
          cumulative time to a string format for the child_key parameter.