code: def micro_calc(TP, item):
      
      try:
          TP_sum = sum(TP.values())
          item_sum = sum(item.values())
          return TP_sum / (TP_sum + item_sum)
      except Exception:
          return "None"
docs: Calculate PPV_Micro and TPR_Micro.
  
      :param TP: true positive
      :type TP:dict
      :param item: FN or FP
      :type item : dict
      :return: PPV_Micro or TPR_Micro as float