code: def get_pval_field(self):
          
          pval_fld = self.args.pval_field
          # If --pval_field [VAL] was specified
          if pval_fld is not None:
              if pval_fld[:2] != 'p_':
                  pval_fld = 'p_' + pval_fld
          # If only one method was used, use that instead of the uncorrected pvalue
          elif len(self.methods) == 1:
              pval_fld = 'p_' + self.methods[0]
          # Use 'uncorrected pvalue' if there are many methods & none chosen using --pval_field
          else:
              pval_fld = 'p_uncorrected'
          if self.results_all:
              assert hasattr(next(iter(self.results_all)), pval_fld), \
                  'NO PVAL({P}). EXPECTED ONE OF: {E}'.format(
                      P=self.args.pval_field,
                      E=" ".join([k for k in dir(next(iter(self.results_all))) if k[:2] == 'p_']))
          return pval_fld
docs: Get 'p_uncorrected' or the user-specified field for determining significant results.