code: def DP_calc(TPR, TNR):
      
      try:
          X = TPR / (1 - TPR)
          Y = TNR / (1 - TNR)
          return (math.sqrt(3) / math.pi) * (math.log(X, 10) + math.log(Y, 10))
      except Exception:
          return "None"
docs: Calculate DP (Discriminant power).
  
      :param TNR: specificity or true negative rate
      :type TNR : float
      :param TPR: sensitivity, recall, hit rate, or true positive rate
      :type TPR : float
      :return: DP as float