code: def mainloop(self):
          
          #proxy = config.engine.open()
  
          if len(self.args) != 3:
              self.fatal("You MUST provide names for index (row), column, and value!")
  
          # Load data
          df = pd.read_json(sys.stdin, orient='records')
          df[self.args[0]] = df[self.args[0]].str.slice(0, 42)
          #print(df[self.args[0]])
          #print(df.head(5))
          df = df.groupby(self.args[:2], as_index=False).mean()
  
          # Create image
          imagefile = 'heatmap.png'
          self.heatmap(df, imagefile)
  
          # Optionally show created image
          if self.options.open:
              subprocess.call("xdg-open {} &".format(quoted(imagefile)), shell=True)
docs: The main loop.