code: def p_expression_mod(self, p):
          'expression : expression MOD expression'
          p[0] = Mod(p[1], p[3], lineno=p.lineno(1))
          p.set_lineno(0, p.lineno(1)f p_expression_mod(self, p):
          'expression : expression MOD expression'
          p[0] = Mod(p[1], p[3], lineno=p.lineno(1))
          p.set_lineno(0, p.lineno(1))
docs: expression : expression MOD expression