code: def _init_pval_name(self, **kws):
          
          if 'pval_name' in kws:
              return kws['pval_name']
          # If go2res contains GO Terms
          if self.is_goterm:
              return "p_{M}".format(M=next(iter(self.go2res.values())).get_method_name())
          # If go2res contains GO namedtuples
          for fld in next(iter(self.go2res.values()))._fields:
              if fld[:2] == 'p_' and fld != 'p_uncorrected':
                  return fld
docs: Initialize pvalue attribute name.