machinelearning_notebook/exercise/1_python.ipynb

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    "# Python & Machine Learning Exercises"
   ]
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    "## Python\n",
    "\n",
    "###  （1）字符串\n",
    "给定一个文章，找出每个单词的出现次数\n",
    "\n",
    "```\n",
    "One is always on a strange road, watching strange scenery and listening to strange music. Then one day, you will find that the things you try hard to forget are already gone. \n",
    "```\n",
    "\n",
    "### （2）组合\n",
    "有 1、2、3、4 个数字，能组成多少个互不相同且无重复数字的三位数？都是多少？\n",
    "\n",
    "\n",
    "### （3） 判断\n",
    "企业发放的奖金根据利润提成。利润(I)： \n",
    "* 低于或等于 10 万元时，奖金可提 10%； \n",
    "* 高于 10 万元，低于 20 万元时，低于 10 万元的部分按 10%提成，高于 10 万元的部分，可提成 7.5%； \n",
    "* 20 万到 40 万之间时，高于 20 万元的部分，可提成 5%； \n",
    "* 40 万到 60 万之间时，高于 40 万元的部分，可提成 3%； \n",
    "* 60 万到 100 万之间时，高于 60 万元的部分，可提成 1.5%， \n",
    "* 高于 100 万元时， 超过 100 万元的部分按 1%提成， \n",
    "从键盘输入当月利润 I，求应发放奖金总数？\n",
    "\n",
    "\n",
    "### （4）循环\n",
    "输出9x9的乘法口诀表\n",
    "\n",
    "\n",
    "### （5）使用while循环实现输出2-3+4-5+6.....+100的和\n",
    "\n",
    "\n",
    "### （6）算法\n",
    "给一个数字列表，将其按照由大到小的顺序排列\n",
    "\n",
    "例如\n",
    "```\n",
    "1, 10, 4, 2, 9, 2, 34, 5, 9, 8, 5, 0\n",
    "```\n",
    "\n",
    "### （7）应用1\n",
    "做为 Apple Store App 独立开发者，你要搞限时促销，为你的应用生成激活码（或者优惠券），使用 Python 如何生成 200 个激活码（或者优惠券）？\n",
    "\n",
    "需要考虑什么是激活码？有什么特性？例如`KR603guyVvR`是一个激活码\n",
    "\n",
    "### （8）应用2\n",
    "需要把某个目录下面所有的某种类型的文件找到。\n",
    "例如把`c:`下面所有的`.dll`文件找到\n",
    "\n",
    "### （9）应用3\n",
    "你有个目录，里面是程序（假如是C或者是Python），统计一下你写过多少行代码。包括空行和注释，但是要分别列出来。\n",
    "\n"
   ]
  }
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