update

mageed · mageed · commit b5654d0d10aa · 2016-01-17T14:21:09.000-05:00
diff --git a/python_tutorial.ipynb b/python_tutorial.ipynb
@@ -16,6 +16,13 @@
     "Python has a number of types. You need to be familiar with some of them as a start, then you will learn about more as you go. Let's quickly investigate some of these here:"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "#Integers and floats"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 5,
@@ -81,13 +88,13 @@
    ]
   },
   {
-   "cell_type": "code",
-   "execution_count": null,
+   "cell_type": "markdown",
    "metadata": {
     "collapsed": true
    },
-   "outputs": [],
-   "source": []
+   "source": [
+    "# Strings"
+   ]
   },
   {
    "cell_type": "code",
@@ -112,15 +119,6 @@
     "print \"Hello world\""
    ]
   },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {
-    "collapsed": true
-   },
-   "outputs": [],
-   "source": []
-  },
   {
    "cell_type": "code",
    "execution_count": 2,
@@ -174,6 +172,13 @@
     "print \"The type of the value: \", len(feeling)\n"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Lists"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 7,
@@ -320,49 +325,86 @@
    ]
   },
   {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {
-    "collapsed": true
-   },
-   "outputs": [],
-   "source": []
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
+   "cell_type": "markdown",
    "metadata": {
     "collapsed": true
    },
-   "outputs": [],
-   "source": []
+   "source": [
+    "# Dictionaries"
+   ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 3,
    "metadata": {
-    "collapsed": true
+    "collapsed": false
    },
-   "outputs": [],
-   "source": []
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "{777: 'Mary', 1111: 'John'}\n",
+      "2\n",
+      "Mary\n"
+     ]
+    }
+   ],
+   "source": [
+    "# A Ptthon dictionary is a \"mapping\" type. We map a \"key\" to a \"value\".\n",
+    "# For example, we can map a \"student_id\" to the \"name\" of a student.\n",
+    "# The sytax is simple: We use the curly braces, and delimit each key:value pair by the \"colon\"\n",
+    "students={1111: \"John\", 777: \"Mary\"}\n",
+    "print \"Printing the 'students' dict: \", students\n",
+    "print \"The length of the 'students' dict is: \", len(students)\n",
+    "# This is how you access the value of the key 777\n",
+    "print print \"The value of the key 777 in the 'students' dict is: \", students[777]"
+   ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 5,
    "metadata": {
-    "collapsed": true
+    "collapsed": false
    },
-   "outputs": [],
-   "source": []
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The value of the key 'CS' in the 'students' dict is:  John\n"
+     ]
+    }
+   ],
+   "source": [
+    "# The keys don't have to be integers; they can be strings too. \n",
+    "# Lets have keys represent the school of a student:\n",
+    "students={\"CS\": \"John\", \"Business\": \"Mary\"}\n",
+    "print \"The value of the key 'CS' in the 'students' dict is: \", students['CS']"
+   ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 6,
    "metadata": {
-    "collapsed": true
+    "collapsed": false
    },
-   "outputs": [],
-   "source": []
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The value of the key 'CS' in the 'students' dict is:  ['John', 'Alex', 'Amanda']\n"
+     ]
+    }
+   ],
+   "source": [
+    "# A value in a Python dict can be a string, a list, another dict, etc.\n",
+    "# So, if \"Alex\" and \"Amanda\" are also students in CS, then we can have the value for the key 'CS' as a list:\n",
+    "students={\"CS\": [\"John\", \"Alex\", \"Amanda\"] , \"Business\": \"Mary\"}\n",
+    "# And now when we print, we get all the students in CS as a full list:\n",
+    "print \"The value of the key 'CS' in the 'students' dict is: \", students['CS']"
+   ]
   },
   {
    "cell_type": "code",
