{
 "cells": [
  {
   "cell_type": "markdown",
   "id": "530b7c09",
   "metadata": {
    "slideshow": {
     "slide_type": "slide"
    }
   },
   "source": [
    "# While Loops\n",
    "#### CS 65: Introduction to Computer Science I"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "7ad9681c",
   "metadata": {
    "slideshow": {
     "slide_type": "slide"
    }
   },
   "source": [
    "## Repeating code\n",
    "\n",
    "\n",
    "Sometimes we want a section of our code to repeat multiple times. For this we use a __loop__. \n",
    "\n",
    "The first loop we're going to look at is a `while` loop. Its syntax is a lot like the `if` statement (but there's no else part):\n",
    "* keyword `while`\n",
    "* condition\n",
    "* colon `:`\n",
    "* indented block of code\n",
    "\n",
    "Example: remember this code we wrote for a simple guess-the-number game? What if we want the user to be able to keep guess until they get it right?"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "id": "8554df15",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Guess a number: 6\n",
      "Wrong!\n",
      "Guess a number: 100\n",
      "Wrong!\n",
      "Guess a number: 7\n",
      "That was right, good guess!\n"
     ]
    }
   ],
   "source": [
    "secret_number = 7\n",
    "guess = 0\n",
    "\n",
    "while guess != secret_number:\n",
    "    guess = int(input(\"Guess a number: \"))\n",
    "\n",
    "    if guess == secret_number:\n",
    "        print(\"That was right, good guess!\")\n",
    "    else:\n",
    "        print(\"Wrong!\")"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "3fe2c8b3",
   "metadata": {
    "slideshow": {
     "slide_type": "slide"
    }
   },
   "source": [
    "## Input validation\n",
    "\n",
    "__input validation:__ making sure the user's input makes sense for the program\n",
    "\n",
    "We can use the same pattern as the guess-the-number loop to make an input-validation loop."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "id": "8cebb2e3",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Soccer team registration form\n",
      "How many players on your team (minimum 11)? 9\n",
      "How many players on your team (minimum 11)? 10\n",
      "How many players on your team (minimum 11)? 8\n",
      "How many players on your team (minimum 11)? 8\n",
      "How many players on your team (minimum 11)? 9\n",
      "How many players on your team (minimum 11)? 9\n",
      "How many players on your team (minimum 11)? 9\n",
      "How many players on your team (minimum 11)? 12\n",
      "Registering team with 12 players...\n"
     ]
    }
   ],
   "source": [
    "print(\"Soccer team registration form\")\n",
    "num_players = 0\n",
    "\n",
    "while num_players < 11:\n",
    "    num_players = int(input(\"How many players on your team (minimum 11)? \"))\n",
    "    \n",
    "print(\"Registering team with\",num_players,\"players...\")"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "9036bcab",
   "metadata": {
    "slideshow": {
     "slide_type": "slide"
    }
   },
   "source": [
    "## Counting\n",
    "\n",
    "Loops are good for counting things. A variable that is used to count something is called a  __counter__.\n",
    "\n",
    "Let's say we want to count how many guesses it took for the user to guess the number."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "id": "df3eb551",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Guess a number: 6\n",
      "Wrong!\n",
      "Guess a number: 4\n",
      "Wrong!\n",
      "Guess a number: 9\n",
      "Wrong!\n",
      "Guess a number: 8\n",
      "Wrong!\n",
      "Guess a number: 7\n",
      "That was right, good guess!\n",
      "That took 5 guesses\n"
     ]
    }
   ],
   "source": [
    "secret_number = 7\n",
    "guess = 0\n",
    "guess_counter = 0\n",
    "\n",
    "while guess != secret_number:\n",
    "    guess = int(input(\"Guess a number: \"))\n",
    "    guess_counter += 1 #this is the same as guess_counter = guess_counter + 1\n",
    "\n",
    "    if guess == secret_number:\n",
    "        print(\"That was right, good guess!\")\n",
    "    else:\n",
    "        print(\"Wrong!\")\n",
    "        \n",
    "print(\"That took\",guess_counter,\"guesses\")"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "4e3ed935",
   "metadata": {
    "slideshow": {
     "slide_type": "slide"
    }
   },
   "source": [
    "## Thonny Debugger Demo\n",
    "\n",
    "The Thonny debugger is a helpful tool that allows you to step through your program and watch what's happening as it executes. \n",
    "\n",
    "Let's look at how to use it now.\n",
    "\n",
    "You should get in the habit of using the debugger to help identify logic errors in your code."
   ]
  },
  {
   "cell_type": "markdown",
   "id": "ed68cc00",
   "metadata": {
    "slideshow": {
     "slide_type": "slide"
    }
   },
   "source": [
    "## Count-controlled loops\n",
    "\n",
    "You can even use counter variables to control how many times the loop will run."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "id": "a8f6e8b0",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "How far should we make the car drive?10\n",
      "Time 0\n",
      "  ______\n",
      " /|_||_\\`.__\n",
      "(   _    _ _\\\n",
      "=`-(_)--(_)-')\n",
      "Time 1\n",
      "\t  ______\n",
      "\t /|_||_\\`.__\n",
      "\t(   _    _ _\\\n",
      "\t=`-(_)--(_)-')\n",
      "Time 2\n",
      "\t\t  ______\n",
      "\t\t /|_||_\\`.__\n",
      "\t\t(   _    _ _\\\n",
      "\t\t=`-(_)--(_)-')\n",
      "Time 3\n",
      "\t\t\t  ______\n",
      "\t\t\t /|_||_\\`.__\n",
      "\t\t\t(   _    _ _\\\n",
      "\t\t\t=`-(_)--(_)-')\n",
      "Time 4\n",
      "\t\t\t\t  ______\n",
      "\t\t\t\t /|_||_\\`.__\n",
      "\t\t\t\t(   _    _ _\\\n",
      "\t\t\t\t=`-(_)--(_)-')\n",
      "Time 5\n",
      "\t\t\t\t\t  ______\n",
      "\t\t\t\t\t /|_||_\\`.__\n",
      "\t\t\t\t\t(   _    _ _\\\n",
      "\t\t\t\t\t=`-(_)--(_)-')\n",
      "Time 6\n",
      "\t\t\t\t\t\t  ______\n",
      "\t\t\t\t\t\t /|_||_\\`.__\n",
      "\t\t\t\t\t\t(   _    _ _\\\n",
      "\t\t\t\t\t\t=`-(_)--(_)-')\n",
      "Time 7\n",
      "\t\t\t\t\t\t\t  ______\n",
      "\t\t\t\t\t\t\t /|_||_\\`.__\n",
      "\t\t\t\t\t\t\t(   _    _ _\\\n",
      "\t\t\t\t\t\t\t=`-(_)--(_)-')\n",
      "Time 8\n",
      "\t\t\t\t\t\t\t\t  ______\n",
      "\t\t\t\t\t\t\t\t /|_||_\\`.__\n",
      "\t\t\t\t\t\t\t\t(   _    _ _\\\n",
      "\t\t\t\t\t\t\t\t=`-(_)--(_)-')\n",
      "Time 9\n",
      "\t\t\t\t\t\t\t\t\t  ______\n",
      "\t\t\t\t\t\t\t\t\t /|_||_\\`.__\n",
      "\t\t\t\t\t\t\t\t\t(   _    _ _\\\n",
      "\t\t\t\t\t\t\t\t\t=`-(_)--(_)-')\n"
     ]
    }
   ],
   "source": [
    "how_far = int(input(\"How far should we make the car drive?\"))\n",
    "counter = 0\n",
    "\n",
    "while counter < how_far:\n",
    "    print(\"Time\",counter)\n",
    "    print(\"\\t\"*counter+\"  ______\")\n",
    "    print(\"\\t\"*counter+\" /|_||_\\`.__\")\n",
    "    print(\"\\t\"*counter+\"(   _    _ _\\\\\")\n",
    "    print(\"\\t\"*counter+\"=`-(_)--(_)-')\")\n",
    "    counter += 1"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "65919b8b",
   "metadata": {
    "slideshow": {
     "slide_type": "slide"
    }
   },
   "source": [
    "## Accumulation\n",
    "\n",
    "An __accumulator__ variable keeps a running total of something. Loops are good for this too."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "id": "ed3a5ccc",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Enter item cost (0 to quit): 12.50\n",
      "Enter item cost (0 to quit): 10.00\n",
      "Enter item cost (0 to quit): 15.75\n",
      "Enter item cost (0 to quit): 5.00\n",
      "Enter item cost (0 to quit): 0\n",
      "The total is 43.25\n"
     ]
    }
   ],
   "source": [
    "total_bill = 0.0 #accumulator\n",
    "item_cost = -1\n",
    "while item_cost != 0.0:\n",
    "    \n",
    "    item_cost = float(input(\"Enter item cost (0 to quit): \"))\n",
    "    \n",
    "    total_bill += item_cost #this is the same as total_bill = total_bill + item_cost\n",
    "\n",
    "print(\"The total is\",total_bill)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "0133180b",
   "metadata": {
    "slideshow": {
     "slide_type": "slide"
    }
   },
   "source": [
    "## Tips for writing loops\n",
    "\n",
    "* Think about what needs to happen before the loop, during each loop __iteration__, and after the loop\n",
    "* Think about what condition should make the loop end\n",
    "* Make sure there is something that changes inside the loop that will eventually allow the loop's condition to be `False`\n",
    "* Set up loop control variables with initial values _before_ the loop\n",
    "\n",
    "Loops that don't have a way of terminating are called __infinite loops__. If you accidentally do this in Thonny, you can kill the program by hitting the STOP button."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "id": "80b90121",
   "metadata": {},
   "outputs": [
    {
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      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[0;31mKeyboardInterrupt\u001b[0m                         Traceback (most recent call last)",
      "\u001b[0;32m<ipython-input-8-356bb646ae46>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[1;32m      1\u001b[0m \u001b[0mcounter\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0;36m0\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m      2\u001b[0m \u001b[0;32mwhile\u001b[0m \u001b[0mcounter\u001b[0m \u001b[0;34m<\u001b[0m \u001b[0;36m10\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 3\u001b[0;31m     \u001b[0mprint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"counter:\"\u001b[0m\u001b[0;34m,\u001b[0m\u001b[0mcounter\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m      4\u001b[0m \u001b[0mcounter\u001b[0m \u001b[0;34m+=\u001b[0m \u001b[0;36m1\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
      "\u001b[0;32m~/opt/anaconda3/lib/python3.8/site-packages/ipykernel/iostream.py\u001b[0m in \u001b[0;36mwrite\u001b[0;34m(self, string)\u001b[0m\n\u001b[1;32m    402\u001b[0m             \u001b[0mis_child\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0;34m(\u001b[0m\u001b[0;32mnot\u001b[0m \u001b[0mself\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0m_is_master_process\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    403\u001b[0m             \u001b[0;31m# only touch the buffer in the IO thread to avoid races\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m--> 404\u001b[0;31m             \u001b[0mself\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mpub_thread\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mschedule\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;32mlambda\u001b[0m \u001b[0;34m:\u001b[0m \u001b[0mself\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0m_buffer\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mwrite\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mstring\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m    405\u001b[0m             \u001b[0;32mif\u001b[0m \u001b[0mis_child\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    406\u001b[0m                 \u001b[0;31m# mp.Pool cannot be trusted to flush promptly (or ever),\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
      "\u001b[0;32m~/opt/anaconda3/lib/python3.8/site-packages/ipykernel/iostream.py\u001b[0m in \u001b[0;36mschedule\u001b[0;34m(self, f)\u001b[0m\n\u001b[1;32m    203\u001b[0m             \u001b[0mself\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0m_events\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mappend\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mf\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    204\u001b[0m             \u001b[0;31m# wake event thread (message content is ignored)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m--> 205\u001b[0;31m             \u001b[0mself\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0m_event_pipe\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0msend\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34mb''\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m    206\u001b[0m         \u001b[0;32melse\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    207\u001b[0m             \u001b[0mf\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
      "\u001b[0;32m~/opt/anaconda3/lib/python3.8/site-packages/zmq/sugar/socket.py\u001b[0m in \u001b[0;36msend\u001b[0;34m(self, data, flags, copy, track, routing_id, group)\u001b[0m\n\u001b[1;32m    489\u001b[0m                                  copy_threshold=self.copy_threshold)\n\u001b[1;32m    490\u001b[0m             \u001b[0mdata\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mgroup\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mgroup\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m--> 491\u001b[0;31m         \u001b[0;32mreturn\u001b[0m \u001b[0msuper\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mSocket\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mself\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0msend\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mdata\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mflags\u001b[0m\u001b[0;34m=\u001b[0m\u001b[0mflags\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mcopy\u001b[0m\u001b[0;34m=\u001b[0m\u001b[0mcopy\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mtrack\u001b[0m\u001b[0;34m=\u001b[0m\u001b[0mtrack\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m    492\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    493\u001b[0m     \u001b[0;32mdef\u001b[0m \u001b[0msend_multipart\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mself\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mmsg_parts\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mflags\u001b[0m\u001b[0;34m=\u001b[0m\u001b[0;36m0\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mcopy\u001b[0m\u001b[0;34m=\u001b[0m\u001b[0;32mTrue\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mtrack\u001b[0m\u001b[0;34m=\u001b[0m\u001b[0;32mFalse\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0;34m**\u001b[0m\u001b[0mkwargs\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
      "\u001b[0;32mzmq/backend/cython/socket.pyx\u001b[0m in \u001b[0;36mzmq.backend.cython.socket.Socket.send\u001b[0;34m()\u001b[0m\n",
      "\u001b[0;32mzmq/backend/cython/socket.pyx\u001b[0m in \u001b[0;36mzmq.backend.cython.socket.Socket.send\u001b[0;34m()\u001b[0m\n",
      "\u001b[0;32mzmq/backend/cython/socket.pyx\u001b[0m in \u001b[0;36mzmq.backend.cython.socket._send_copy\u001b[0;34m()\u001b[0m\n",
      "\u001b[0;32m~/opt/anaconda3/lib/python3.8/site-packages/zmq/backend/cython/checkrc.pxd\u001b[0m in \u001b[0;36mzmq.backend.cython.checkrc._check_rc\u001b[0;34m()\u001b[0m\n",
      "\u001b[0;31mKeyboardInterrupt\u001b[0m: "
     ]
    }
   ],
   "source": [
    "counter = 0\n",
    "while counter < 10:\n",
    "    print(\"counter:\",counter)\n",
    "counter += 1"
   ]
  },
  {
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   "id": "53f9bb9e",
   "metadata": {
    "slideshow": {
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    "## Loops with Lists\n",
    "\n",
    "Loops are really good for doing things with lists. For example, you use the `len()` function to find out how many items are in a list and then create a count-controlled loop to go through each item in the list, using the counter as the list index. For example, this list will print out all of the values in the rainfall_amounts list."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "id": "092666df",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Day 0 had 0.0 inches of rainfall.\n",
      "Day 1 had 0.3 inches of rainfall.\n",
      "Day 2 had 0.71 inches of rainfall.\n",
      "Day 3 had 0.0 inches of rainfall.\n",
      "Day 4 had 0.32 inches of rainfall.\n",
      "Day 5 had 1.1 inches of rainfall.\n",
      "Day 6 had 0.4 inches of rainfall.\n"
     ]
    }
   ],
   "source": [
    "rainfall = [0.0, 0.3, 0.71, 0.0, 0.32, 1.1, 0.4]\n",
    "\n",
    "counter = 0\n",
    "while counter < len(rainfall):\n",
    "    print(\"Day\",counter,\"had\",rainfall[counter],\"inches of rainfall.\")\n",
    "    counter += 1"
   ]
  }
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