Move FizzBuzz exercise from chapter 01 to 03

03_conditionals_review_and_exercises.ipynb

@@ -211,11 +211,6 @@
     "\n",
     "\n",
     "\n",
-    "\n",
-    "\n",
-    "\n",
-    "\n",
-    "\n",
     "\n"
    ]
   },
@@ -235,28 +230,36 @@
    "execution_count": null,
    "metadata": {},
    "outputs": [],
-   "source": []
+   "source": [
+    "discounted_price(...)"
+   ]
   },
   {
    "cell_type": "code",
    "execution_count": null,
    "metadata": {},
    "outputs": [],
-   "source": []
+   "source": [
+    "discounted_price(...)"
+   ]
   },
   {
    "cell_type": "code",
    "execution_count": null,
    "metadata": {},
    "outputs": [],
-   "source": []
+   "source": [
+    "discounted_price(...)"
+   ]
   },
   {
    "cell_type": "code",
    "execution_count": null,
    "metadata": {},
    "outputs": [],
-   "source": []
+   "source": [
+    "discounted_price(...)"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -270,14 +273,18 @@
    "execution_count": null,
    "metadata": {},
    "outputs": [],
-   "source": []
+   "source": [
+    "discounted_price(...)"
+   ]
   },
   {
    "cell_type": "code",
    "execution_count": null,
    "metadata": {},
    "outputs": [],
-   "source": []
+   "source": [
+    "discounted_price(...)"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -304,14 +311,23 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "### Fizz Buzz revisited"
+    "### Fizz Buzz"
    ]
   },
   {
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "When you worked on the Fizz Buzz exercise in Chapter 1, you actually did not know about the `elif` and `else` keywords yet. Well, now you do."
+    "The kids game [Fizz Buzz](https://en.wikipedia.org/wiki/Fizz_buzz) is said to be often used in job interviews for entry level positions. However, opinions vary as to how good of a test it actually is ([source](https://news.ycombinator.com/item?id=16446774)).\n",
+    "\n",
+    "In its simplest form, a group of people start counting upwards in an alternating fashion. Whenever a number is divisible by $3$, the person must say \"Fizz\" instead of the number. The same holds for numbers divisible by $5$ when the person must say \"Buzz\". If a number is divisible by both numbers, one must say \"FizzBuzz\". Probably, this game would also make a good drinking game with the \"right\" beverages."
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "**Q9.1**: First, create a list `numbers` with the numbers from 1 through 100. You could type all numbers manually but there is of course a smarter way. The built-in [range()](https://docs.python.org/3/library/functions.html#func-range) may be useful here. Read how it works in the documentation. To make the output of [range()](https://docs.python.org/3/library/functions.html#func-range) a `list` object, you have to wrap it with the [list()](https://docs.python.org/3/library/functions.html#func-list) built-in (i.e., `list(range(...))`)."
    ]
   },
   {
@@ -320,16 +336,20 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "numbers = list(range(1, 101))"
+    "numbers = ..."
    ]
   },
   {
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "**Q9**: Copy and paste your answer to **Q11.2** in Chapter 1 here and instead of three consecutive `if` statements re-write it with *one* compound `if` statement.\n",
+    "**Q9.2**: Loop over the `numbers` list and replace numbers for which one of the two (or both) conditions apply with text strings `\"Fizz\"`, `\"Buzz\"`, or `\"FizzBuzz\"` using the indexing operator `[]` and the assignment statement `=`.\n",
     "\n",
-    "This code will then be a lot more robust as the order of the three `if` statements cannot be screwed up."
+    "In Chapter 1 we saw that Python starts indexing with `0` as the first element. Keep that in mind.\n",
+    "\n",
+    "So in each iteration of the `for`-loop you have to determine an `index` variable as well as checking the actual `number` for its divisors.\n",
+    "\n",
+    "Hint: the order of the conditions is important!"
    ]
   },
   {
@@ -338,17 +358,31 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "\n",
-    "\n",
-    "\n",
-    "\n",
-    "\n",
-    "\n",
-    "\n",
-    "\n",
-    "\n",
-    "\n",
-    "\n"
+    "for number in numbers:\n",
+    "    ...\n",
+    "    ...\n",
+    "    ...\n",
+    "    ...\n",
+    "    ...\n",
+    "    ...\n",
+    "    ..."
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "**Q9.3**: Create a loop that prints out either the number or any of the Fizz Buzz substitutes. Do it in such a way that we do not end up with 100 lines of output here."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "for number in numbers:\n",
+    "    print(...)"
    ]
   }
  ],