07-files.ipynb

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    "#### Before you start working on these exercises, make sure you've watched the videos, done the reading, and taken the quiz!\n",
    "\n",
    "General Resources:\n",
    "* [Main PY4E Website](https://www.py4e.com)\n",
    "* [Full Textbook PDF](http://do1.dr-chuck.com/pythonlearn/EN_us/pythonlearn.pdf)\n",
    "* [Full Youtube Playlist](https://www.youtube.com/playlist?list=PLlRFEj9H3Oj7Bp8-DfGpfAfDBiblRfl5p)\n",
    "\n",
    "Lesson 7 Resources:\n",
    "* [Lesson Page](https://www.py4e.com/lessons/files)\n",
    "* [Video 7.1](https://www.youtube.com/watch?v=9KJ-XeQ6ZlI&list=PLlRFEj9H3Oj7Bp8-DfGpfAfDBiblRfl5p&index=30)\n",
    "* [Video 7.2](https://www.youtube.com/watch?v=0t4rvnySKR4&list=PLlRFEj9H3Oj7Bp8-DfGpfAfDBiblRfl5p&index=31)\n",
    "* [Lesson Slides](https://www.py4e.com/lectures3/Pythonlearn-07-Files.pptx)\n",
    "* [Textbook Chapter 7](https://www.py4e.com/html3/07-files)\n",
    "* [Link to Quiz (must be logged in)](https://www.py4e.com/lessons_launch/py4e_07_files_quiz)\n",
    "* If you're feeling stuck on exercise 7.1, worked solutions are available on the lesson page and Youtube"
   ]
  },
  {
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   "metadata": {},
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   "source": [
    "# Make sure to run this cell to load the autograder!\n",
    "from grader import check_exercise"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**Exercise 1: Write a program to read through a file and print the\n",
    "contents of the file (line by line) all in upper case. Executing the\n",
    "program will look as follows:**\n",
    "\n",
    "~~~~\n",
    "Enter a file name: mbox-short.txt\n",
    "FROM STEPHEN.MARQUARD@UCT.AC.ZA SAT JAN  5 09:14:16 2008\n",
    "RETURN-PATH: <POSTMASTER@COLLAB.SAKAIPROJECT.ORG>\n",
    "RECEIVED: FROM MURDER (MAIL.UMICH.EDU [141.211.14.90])\n",
    "     BY FRANKENSTEIN.MAIL.UMICH.EDU (CYRUS V2.3.8) WITH LMTPA;\n",
    "     SAT, 05 JAN 2008 09:14:16 -0500\n",
    "~~~~"
   ]
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  {
   "cell_type": "code",
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   "source": [
    "exercise = 'Exercise 7.1'\n",
    "\n",
    "### Start Code Here ###\n",
    "\n",
    "###  End Code Here  ###"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Make sure to save your notebook before checking!\n",
    "check_exercise('Exercise 7.1')"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**Exercise 2: Write a program to prompt for a file name, and then read\n",
    "through the file and look for lines of the form:**\n",
    "\n",
    "~~~~\n",
    "X-DSPAM-Confidence: 0.8475\n",
    "~~~~\n",
    "\n",
    "**When you encounter a line that starts with \"X-DSPAM-Confidence:\" pull\n",
    "apart the line to extract the floating-point number on the line. Count\n",
    "these lines and then compute the total of the spam confidence values\n",
    "from these lines. When you reach the end of the file, print out the\n",
    "average spam confidence, rounded to 5 decimal points.**\n",
    "\n",
    "~~~~\n",
    "Enter the file name: mbox.txt\n",
    "Average spam confidence: 0.89412\n",
    "\n",
    "Enter the file name: mbox-short.txt\n",
    "Average spam confidence: 0.75072\n",
    "~~~~\n",
    "\n",
    "**Test your file on the *mbox.txt* and *mbox-short.txt* files.**"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "exercise = 'Exercise 7.2'\n",
    "\n",
    "### Start Code Here ###\n",
    "\n",
    "###  End Code Here  ###\n",
    "\n",
    "print(round(average,5)) # Rounds answer to 5 decimal points"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Make sure to save your notebook before checking!\n",
    "check_exercise('Exercise 7.2')"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**Exercise 3: Sometimes when programmers get bored or want to have a bit\n",
    "of fun, they add a harmless *Easter Egg* to their program.\n",
    "Modify the program that prompts the user for the file name so that it\n",
    "prints a funny message when the user types in the exact file name \"na na\n",
    "boo boo\". The program should behave normally for all other files which\n",
    "exist and don't exist. Here is a sample execution of the program:**\n",
    "\n",
    "**Remeber from the textbook that each subject line starts with the string \"Subject:\"**\n",
    "\n",
    "\n",
    "~~~~\n",
    "Enter the file name: mbox.txt\n",
    "There were 1797 subject lines in mbox.txt\n",
    "\n",
    "Enter the file name: missing.tyxt\n",
    "File cannot be opened: missing.tyxt\n",
    "\n",
    "Enter the file name: na na boo boo\n",
    "NA NA BOO BOO TO YOU - You have been punk'd!\n",
    "~~~~\n",
    "\n",
    "**We are not encouraging you to put Easter Eggs in your programs; this is\n",
    "just an exercise.**"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "exercise = 'Exercise 7.3'\n",
    "\n",
    "### Start Code Here ###\n",
    "\n",
    "###  End Code Here  ###"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Make sure to save your notebook before checking!\n",
    "check_exercise('Exercise 7.3')"
   ]
  }
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