code: def F_calc(TP, FP, FN, beta):
      
      try:
          result = ((1 + (beta)**2) * TP) / \
              ((1 + (beta)**2) * TP + FP + (beta**2) * FN)
          return result
      except ZeroDivisionError:
          return "None"
docs: Calculate F-score.
  
      :param TP: true positive
      :type TP : int
      :param FP: false positive
      :type FP : int
      :param FN: false negative
      :type FN : int
      :param beta : beta coefficient
      :type beta : float
      :return: F score as float