{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 共有，私有和特殊方法和属性"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "- 我们之前已经见过 `special` 方法和属性，即以 `__` 开头和结尾的方法和属性\n",
    "- 私有方法和属性，以 `_` 开头，不过不是真正私有，而是可以调用的，但是不会被代码自动完成所记录（即 Tab 键之后不会显示）\n",
    "- 其他都是共有的方法和属性\n",
    "- 以 `__` 开头不以 `__` 结尾的属性是更加特殊的方法，调用方式也不同："
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "class MyClass(object):\n",
    "    def __init__(self):\n",
    "        print \"I'm special!\"\n",
    "    def _private(self):\n",
    "        print \"I'm private!\"\n",
    "    def public(self):\n",
    "        print \"I'm public!\"\n",
    "    def __really_special(self):\n",
    "        print \"I'm really special!\""
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {
    "collapsed": false,
    "scrolled": true
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "I'm special!\n"
     ]
    }
   ],
   "source": [
    "m = MyClass()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "collapsed": false,
    "scrolled": true
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "I'm public!\n"
     ]
    }
   ],
   "source": [
    "m.public()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {
    "collapsed": false,
    "scrolled": true
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "I'm private!\n"
     ]
    }
   ],
   "source": [
    "m._private()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "注意调用方式："
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "I'm really special!\n"
     ]
    }
   ],
   "source": [
    "m._MyClass__really_special()"
   ]
  }
 ],
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