.ipynb_checkpoints

{

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   "cell_type": "markdown",

   "id": "51cac636",

   "metadata": {},

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    "# 五，类的继承，重写与多态\n",

    "    1，继承，子类继承父类的方法\n",

    "    2，重写，子类可以重写子类的方法（方法名称相同）\n",

    "    3，多态，子类中方法名称相同但功能不同\n",

    "    4，实例如下："

   ]

  },

  {

   "cell_type": "code",

   "execution_count": 17,

   "id": "4118abfa",

   "metadata": {},

   "outputs": [],

   "source": [

    "# 定义一个父类person\n",

    "class Person:\n",

    "    def __init__(self,name,sex,age):\n",

    "        self.name = name\n",

    "        self.sex = sex\n",

    "        self.age = age\n",

    "        \n",

    "    def working(self):\n",

    "        print('正在工作！')\n",

    "        \n",

    "    def show(self):\n",

    "        print('姓名：{}\\n性别：{}\\n年龄：{}\\n'.format(self.name,self.sex,self.age))\n",

    "        "

   ]

  },

  {

   "cell_type": "code",

   "execution_count": 18,

   "id": "36d317b3",

   "metadata": {},

   "outputs": [],

   "source": [

    "#定义一个学生类Student\n",

    "class Student(Person):\n",

    "    def __init__(self,name,sex,age,major):\n",

    "        super().__init__(name,sex,age)       #用内置函数super（）继承父类，调用父类初始化方法，相当于self.name = name #self.sex = sex #self.age = age                                            \n",

    "        self.major = major\n",

    "    def studying(self):\n",

    "        print('正在学习！')   \n",

    "    def show(self):             #类的重写\n",

    "        #print('姓名：{}\\n性别：{}\\n年龄：{}\\n专业：{}\\n'.format(self.name,self.sex,self.age，self.major))\n",

    "        Person.show(self)         #继承父类\n",

    "        print('专业:%s\\n'%self.major)"

   ]

  },

  {

   "cell_type": "code",

   "execution_count": 19,

   "id": "c12c2c76",

   "metadata": {},

   "outputs": [],

   "source": [

    "#创建对象:\n",

    "s = Student('严仕扬','男',20,'楼宇')"

   ]

  },

  {

   "cell_type": "code",

   "execution_count": 20,

   "id": "d4c73bf0",

   "metadata": {},

   "outputs": [

    {

     "name": "stdout",

     "output_type": "stream",

     "text": [

      "姓名：严仕扬\n",

      "性别：男\n",

      "年龄：20\n",

      "\n",

      "专业:楼宇\n",

      "\n"

     ]

    }

   ],

   "source": [

    "s.show()"

   ]

  },

  {

   "cell_type": "code",

   "execution_count": 22,

   "id": "4bccc93e",

   "metadata": {

    "scrolled": true

   },

   "outputs": [

    {

     "name": "stdout",

     "output_type": "stream",

     "text": [

      "正在学习！\n"

     ]

    }

   ],

   "source": [

    "s.studying()"

   ]

  },

  {

   "cell_type": "code",

   "execution_count": 23,

   "id": "16701460",

   "metadata": {

    "scrolled": true

   },

   "outputs": [

    {

     "name": "stdout",

     "output_type": "stream",

     "text": [

      "严仕扬 正在学习\n"

     ]

    }

   ],

   "source": [

    "print(s.name,'正在学习')"

   ]

  },

  {

   "cell_type": "code",

   "execution_count": 24,

   "id": "366ff124",

   "metadata": {},

   "outputs": [

    {

     "name": "stdout",

     "output_type": "stream",

     "text": [

      "姓名：严仕扬\n",

      "性别：男\n",

      "年龄：20\n",

      "\n",

      "专业:楼宇\n",

      "\n"

     ]

    }

   ],

   "source": [

    "s.show()"

   ]

  },

  {

   "cell_type": "markdown",

   "id": "2990b0c1",

   "metadata": {},

   "source": [

    "# 六,综合案例分析：\n",

    "    1，定义一个父类student和两个子类levelst和passSt,在父类中定义2个实例变量，使子类继承父类的所有属性和方法，并在各自定义根据成绩\n",

    "    计算等级和判断是否通过的方法；同时。将代码存储在student。py文件中。\n",

    "    2，显示由levelt和passSt类对象构成的学生成绩列表，以及所有学生名字和成绩，并按字典排列\n"

   ]

  },

  {

   "cell_type": "code",

   "execution_count": 51,

   "id": "df2f30b0",

   "metadata": {},

   "outputs": [],

   "source": [

    "#定义student父类\n",

    "class Student:\n",

    "    def __init__(self,name='',grade=0):\n",

    "        self._name=name\n",

    "        self._grade=grade\n",

    "    def show(self):\n",

    "        print('%s\\t %s'%(self.name,self.grade))"

   ]

  },

  {

   "cell_type": "code",

   "execution_count": 52,

   "id": "eca4b2f1",

   "metadata": {},

   "outputs": [],

   "source": [

    "class LeveISt(Student):\n",

    "    def calcLevel(self):             #多态：方法名称相同功能不同·\n",

    "        if self.grade>=90:\n",

    "            return'A'\n",

    "        elif self.grade>=80:\n",

    "            return'B'\n",

    "        elif self.grade>=70:\n",

    "            return'C'\n",

    "        elif self.grade>=60:\n",

    "            return'D'\n",

    "        else:\n",

    "            return'E'\n",

    "        \n",

    "    "

   ]

  },

  {

   "cell_type": "code",

   "execution_count": 53,

   "id": "00e558f4",

   "metadata": {},

   "outputs": [],

   "source": [

    "#(3)定义PassSt子类：\n",

    "class PassSt(Student):\n",

    "    def calcLevel(self):          #多态：方法名称相同功能不同\n",

    "        if self.grade>=60:\n",

    "            return'通过'\n",

    "        else:\n",

    "            return'不通过'\n",

    "    "

   ]

  },

  {

   "cell_type": "code",

   "execution_count": null,

   "id": "5b5ea4f9",

   "metadata": {},

   "outputs": [],

   "source": [

    "#(4)定义列表函数list_ST存放学生数据\n",

    "def list_St():\n",

    "    list_student=[]\n",

    "    is_continue='Y'\n",

    "    while is_continue in ['Y','y']:\n",

    "        name = input('请输入学生姓名:')\n",

    "        grade = float(input('请输入学生成绩：'))\n",

    "        choice = input('请选择成绩输出格式（LevelSt/PassSt）L/p:')\n",

    "        if choice.upper()=='L':       #将输入的小写字母(l或p)转换为大写\n",

    "            s=LevelSt(name,grade)     #创建对象s,并给属性赋值\n",

    "        else:\n",

    "            s=PassSt(name,grade)\n",

    "\n",

    "        list_student.append(s)     #将输入的学生信息追加到列表list_student里面\n",

    "        \n",

    "        is_continue = input('需要继续吗？（Y/N）')  #需要输入多个学生的信息选择Y(y)\n",

    "    return list_student\n",

    "\n",

    "\n",

    "#)5(定义显示处理后的学生信息)\n",

    "def display(list_student):\n",

    "    print('\\n姓名\\t成绩\\n')\n",

    "    list_student.sort(key=lambda x:x.name,reverse = Ture)     #将列表元素按字典由大到小排列\n",

    "    for each in list_student:\n",

    "        each.show()     #将学生信息按行打印出来\n",

    "    \n",

    "\n",

    "#(6)定义主函数：\n",

    "def main():\n",

    "    list_student = list_St()     #调用list_St函数，获得数据\n",

    "    display(list_student)        #将获得的数据作为实际参数传递给函数display形参\n",

    "\n",

    "#调用主函数：\n",

    "if __name__== '__main__':\n",

    "    main()\n"

   ]

  },

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   "cell_type": "code",

   "execution_count": null,

   "id": "028f2220",

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   "source": []

  }

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