code: def get_goid2color_pval(self):
          
          go2color = {}
          self.set_goid2color_pval(go2color)
          color_dflt = self.alpha2col[1.000]
          for goid in self.go2res:
              if goid not in go2color:
                  go2color[goid] = color_dflt
          return go2color
docs: Return a go2color dict containing GO colors determined by P-value.