code: def p_exp_1(self, p):
          "exp : EMINUS NUMBER"
          if DEBUG:
              self.print_p(p)
          p[0] = "e-{0}".format(p[2]f p_exp_1(self, p):
          "exp : EMINUS NUMBER"
          if DEBUG:
              self.print_p(p)
          p[0] = "e-{0}".format(p[2])
docs: exp : EMINUS NUMBER