update variables lab to have assignment and reassignment

Author: JeffKatzy

index.ipynb

@@ -11,48 +11,108 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Now that you know about variables, you went from just attending Python conferences, to being a top knotch guest speaker.  You want to send thank you notes to all of the attendees, and to do so efficiently."
+    "### Introduction"
    ]
   },
   {
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "### Labs with Learn"
+    "Now that you know about variables, you want to use them to associate them with some data.  Here, we will be using variables to store information related to a vacation that we would like to go on.\n",
+    "\n",
+    "Just as before, we ask you to run the code and ensure that it matches what is commented out."
    ]
   },
   {
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "In the first lab, we ensured that we were doing things correctly by seeing that our output matched what we saw as a comment."
+    "### Learning Objectives"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "* Practice variable assignment in Python\n",
+    "* Practice variable reassignment in Python"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "### Assigning variables"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Assign a variable of `travel_month` equal to the string \"January\", as that is the month you would like to travel."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": [
+    "travel_month = None"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "> We start by setting the variable equal to the data type None.  As you know, `None` represents the absence of a value.  And now you can take care of assigning the variable to something other than `None`."
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 4,
+   "execution_count": 8,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "travel_month # \"January\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
    "metadata": {},
-   "outputs": [
-    {
-     "data": {
-      "text/plain": [
-       "'Art Vandelay'"
-      ]
-     },
-     "execution_count": 4,
-     "metadata": {},
-     "output_type": "execute_result"
-    }
-   ],
    "source": [
-    "'art vandelay'.title() # 'Art Vandelay'"
+    "Now let's assign a variable equal to the number of weeks that you would like to travel, 3. "
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 9,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": [
+    "number_of_weeks = None"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 10,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": [
+    "number_of_weeks # 3"
    ]
   },
   {
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "In this lab, we will use double check if we are doing things correctly with Learn."
+    "Now, you just learned that you can travel for a longer period of time.  So reassign the `number_of_weeks` variable equal to `5`."
    ]
   },
   {
@@ -63,7 +123,28 @@
    },
    "outputs": [],
    "source": [
-    "name = 'art vandelay'"
+    "number_of_weeks # 5"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Now that's more like it."
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "### Summary"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Great! In this lab, you were able to get a sense how to store information in variables through assignment and reassignment."
    ]
   }
  ],