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delphiduandelphiduan
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20181225
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‎.ipynb_checkpoints/Python_Learning_08-checkpoint.ipynb‎

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"A.say(B)\n",
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"#鸭子模型，只有有呱呱叫，有翅膀，不游泳的就是鸭子"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## 6.面向对象的三大特征\n",
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"- 封装\n",
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"- 继承\n",
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"- 多态\n",
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"### 6.1 封装\n",
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"- 封装就是对对象的成员进行访问限制\n",
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" - 公开 public\n",
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" - 受保护的 protected\n",
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" - 私有的 private\n",
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" public.protected.pribate都不是关键字\n",
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"- 判断对象位置\n",
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" - 对象内部\n",
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" - 对象外部\n",
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" - 子类中\n",
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"- 私有\n",
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" - 私有成员时最高级别的封装，只能在当前类或对象中访问\n",
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" - 在成员前面加两个__\n",
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" - "
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]
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},
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{
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"cell_type": "code",
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"execution_count": 39,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"{'__module__': '__main__', 'name': 'aaaa', '_Cc__age': 20, '__dict__': <attribute '__dict__' of 'Cc' objects>, '__weakref__': <attribute '__weakref__' of 'Cc' objects>, '__doc__': None}\n",
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"aaaa\n"
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]
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},
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{
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"ename": "AttributeError",
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"evalue": "'Cc' object has no attribute '__age'",
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"output_type": "error",
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"traceback": [
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"\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
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"\u001b[0;31mAttributeError\u001b[0m Traceback (most recent call last)",
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"\u001b[0;32m<ipython-input-39-32393da89076>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[1;32m 7\u001b[0m \u001b[0mprint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mCc\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0m__dict__\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m 8\u001b[0m \u001b[0mprint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mb\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mname\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 9\u001b[0;31m \u001b[0mprint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mb\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0m__age\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
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"\u001b[0;31mAttributeError\u001b[0m: 'Cc' object has no attribute '__age'"
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]
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}
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],
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"source": [
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"\n",
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"class Cc():\n",
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" name = \"aaaa\"\n",
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" __age =20\n",
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"\n",
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"b = Cc()\n",
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"print(Cc.__dict__)\n",
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"print(b.name)\n",
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"print(b.__age)\n"
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]
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}
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],
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"metadata": {
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"kernelspec": {
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"display_name": "Python 3",
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"language": "python",
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"name": "python3"
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},
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"language_info": {
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"codemirror_mode": {
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"name": "ipython",
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"version": 3
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},
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"file_extension": ".py",
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"mimetype": "text/x-python",
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"name": "python",
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"nbconvert_exporter": "python",
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"pygments_lexer": "ipython3",
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"version": "3.7.0"
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}
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},
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"nbformat": 4,

‎.ipynb_checkpoints/Python_Learning_09-checkpoint.ipynb‎

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{
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"cells": [
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"# 6.面向对象的三大特征\n",
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"- 封装\n",
9+
"- 继承\n",
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"- 多态\n",
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"## 6.1 封装\n",
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"- 封装就是对对象的成员进行访问限制\n",
13+
" - 公开 public\\\n",
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" - 受保护的 protected\n",
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" - 私有的 private\n",
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" public.protected.pribate都不是关键字\n",
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"- 判断对象位置\n",
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" - 对象内部\n",
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" - 对象外部\n",
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" - 子类中\n",
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"- 私有\n",
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" - 私有成员时最高级别的封装，只能在当前类或对象中访问\n",
23+
" - 在成员前面加两个__\n",
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" - python的是私有不是真私有，是一种name mangling改变策略\n",
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" "
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]
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},
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{
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"cell_type": "code",
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"execution_count": 1,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"{'__module__': '__main__', 'name': 'aaaa', '_Cc__age': 20, '__dict__': <attribute '__dict__' of 'Cc' objects>, '__weakref__': <attribute '__weakref__' of 'Cc' objects>, '__doc__': None}\n",
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"aaaa\n",
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"{'__module__': '__main__', 'name': 'aaaa', '_Cc__age': 20, '__dict__': <attribute '__dict__' of 'Cc' objects>, '__weakref__': <attribute '__weakref__' of 'Cc' objects>, '__doc__': None}\n"
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]
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}
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],
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"source": [
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"class Cc():\n",
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" name = \"aaaa\"\n",
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" __age =20\n",
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"\n",
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"b = Cc()\n",
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"#name共有变量\n",
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"print(Cc.__dict__)\n",
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"print(b.name)\n",
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"# print(b.__age)\n",
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"print(Cc.__dict__)"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## 6.2 继承\n",
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"- 继承就是一个类可以送用另一个类的成员属性和成员方法\n",
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"- 作用：减少代码，增强代码复用功能，同时可以设置类与类的直接关系\n",
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"- 继承与被继承的概念：\n",
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" - 被继承的类叫父类，也叫基类，超类\n",
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" - 用于继承的类叫之类，也叫派生类\n",
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" - 继承与被继承一定存在is-A的关系\n",
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"- 继承的语法\n"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 4,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"noname\n"
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]
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}
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],
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"source": [
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"class Person():\n",
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" name = \"noname\"\n",
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" age = 0\n",
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" def work(self):\n",
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" print(\"eating\")\n",
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"\n",
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"class Man(Person):\n",
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" pass\n",
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"\n",
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"print(Man.name)"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"- 继承的特征：\n",
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" - 所有的类都继承只object类\n",
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" - 子类一旦继承父类，则可以使用父类的除私有外成员外的所有内容\n",
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" - 子类继承父类是通过引用的关系访问调用的\n",
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" - 子类可以定义独有的成员属性和方法\n",
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" - 子类的定义的成员与父类相同时，则优先使用子类的成员\n",
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" - 子类扩充父类的方法，重新定义，用父类名，父类成员，也可以使用SUPER().父类的成员的格式调用\n",
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" - 继承变量函数的查找顺序问题\n",
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" - 优先查找自己的\n",
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" - 没有查父类\n",
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" - 构建函数如果没有定义，这自动查找父类构造函数\n",
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" - 如果本类有定义，这不在继续向上查找\n"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 16,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"delphi\n",
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"fly\n",
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"2514\n"
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]
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}
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],
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"source": [
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"class Person():\n",
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" name = \"noname\"\n",
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" age = 18\n",
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" __score = 0\n",
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" _petname = \"fly\"\n",
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" def work(self):\n",
136+
" print(\"eating\")\n",
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"class Man(Person):\n",
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" name = \"delphi\"\n",
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" id =2514\n",
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"M = Man() \n",
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"print(M.name)\n",
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"print(M._petname)\n",
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"# print(M.__score)\n",
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"print(M.id)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 26,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"eating\n",
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"attention\n"
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]
159+
}
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],
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"source": [
162+
"class Person():\n",
163+
" name = \"noname\"\n",
164+
" age = 18\n",
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" __score = 0\n",
166+
" _petname = \"fly\"\n",
167+
" def work(self):\n",
168+
" print(\"eating\")\n",
169+
"class Man(Person):\n",
170+
" name = \"delphi\"\n",
171+
" id =2514\n",
172+
" def make(self):\n",
173+
" print(\"attention\")\n",
174+
" def work(self):\n",
175+
"# Person.work(self)\n",
176+
" super().work()\n",
177+
" self.make()\n",
178+
"\n",
179+
"M = Man()\n",
180+
"M.work()\n"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 29,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"wangwang\n"
193+
]
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}
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],
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"source": [
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"class Cat():\n",
198+
" #__init__就是构造函数\n",
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" #每次实例化，第一个被调用\n",
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" #进行初始化\n",
201+
" def __init__(self):\n",
202+
" print(\"wangwang\")\n",
203+
"GG = Cat()"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"- 构造函数\n",
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" - 是一类特殊的函数，在类进行实例化之前进行调用\n",
212+
" - 如果没有定义，自动查找父类的构造函数\n",
213+
" - 没有子类没有定义，父类的构造函数带参数，则构建对象的参数应该按照父类的参数构造\n",
214+
"- super\n",
215+
" - super不是关键字，而是一个类\n",
216+
" - super的作用是获取MRO（MethodResolutionOreder）列表的第一个类\n",
217+
" - super与父类没有直接关系，当时super可以调用父类\n",
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" - super使用的两个方法，调用父类的构造函数"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"class A():\n",
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" pass\n",
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"class B(A):\n",
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" pass"
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]
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}
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],
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"metadata": {
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"kernelspec": {
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"display_name": "Python 3",
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"language": "python",
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"name": "python3"
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},
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"language_info": {
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"codemirror_mode": {
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"name": "ipython",
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"version": 3
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},
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"file_extension": ".py",
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"mimetype": "text/x-python",
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"name": "python",
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"nbconvert_exporter": "python",
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"pygments_lexer": "ipython3",
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"version": "3.7.0"
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}
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},
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"nbformat": 4,
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"nbformat_minor": 2
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}

‎Keys&&Command.xlsx‎

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