code: def _value_formatter(self, float_format=None, threshold=None):
          
  
          # the float_format parameter supersedes self.float_format
          if float_format is None:
              float_format = self.float_format
  
          # we are going to compose different functions, to first convert to
          # a string, then replace the decimal symbol, and finally chop according
          # to the threshold
  
          # when there is no float_format, we use str instead of '%g'
          # because str(0.0) = '0.0' while '%g' % 0.0 = '0'
          if float_format:
              def base_formatter(v):
                  return float_format(value=v) if notna(v) else self.na_rep
          else:
              def base_formatter(v):
                  return str(v) if notna(v) else self.na_rep
  
          if self.decimal != '.':
              def decimal_formatter(v):
                  return base_formatter(v).replace('.', self.decimal, 1)
          else:
              decimal_formatter = base_formatter
  
          if threshold is None:
              return decimal_formatter
  
          def formatter(value):
              if notna(value):
                  if abs(value) > threshold:
                      return decimal_formatter(value)
                  else:
                      return decimal_formatter(0.0)
              else:
                  return self.na_rep
  
          return formatter
docs: Returns a function to be applied on each value to format it