print("I'm %s, my age is %d" %("keinYe", 29)),%用来替换变量的内容 https://cloud.tencent.com/developer/article/1611125?from=information.detail.python%E7%99%BE%E5%88%86%E5%8F%B7 https://blog.youkuaiyun.com/wspba/article/details/72808727 https://www.runoob.com/python/python-strings.html