From 97c7118117465be4606fd145ad8e44006981d8c6 Mon Sep 17 00:00:00 2001
From: Donne Martin <donne.martin@gmail.com>
Date: Tue, 27 Jan 2015 12:57:08 -0500
Subject: [PATCH] Added snippet for generators.

---
 core/functions.ipynb | 58 ++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 53 insertions(+), 5 deletions(-)

diff --git a/core/functions.ipynb b/core/functions.ipynb
index d68e326..5ddb261 100644
--- a/core/functions.ipynb
+++ b/core/functions.ipynb
@@ -1,7 +1,7 @@
 {
  "metadata": {
   "name": "",
-  "signature": "sha256:1123ef3475d906de39c34c42c18ebeda8c0f1c60ee01b6e692125a51b325d8e7"
+  "signature": "sha256:a81c81558508aed1c6f336342652e5f8dcc250ecd9f9f955b9e6e02d65a45c5c"
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -394,13 +394,13 @@
       {
        "metadata": {},
        "output_type": "pyout",
-       "prompt_number": 18,
+       "prompt_number": 8,
        "text": [
         "10"
        ]
       }
      ],
-     "prompt_number": 18
+     "prompt_number": 8
     },
     {
      "cell_type": "markdown",
@@ -423,13 +423,61 @@
       {
        "metadata": {},
        "output_type": "pyout",
-       "prompt_number": 19,
+       "prompt_number": 9,
        "text": [
         "7"
        ]
       }
      ],
-     "prompt_number": 19
+     "prompt_number": 9
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "## Generators"
+     ]
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "A generator is a simple way to construct a new iterable object.  Generators return a sequence lazily.  When you call the generator, no code is immediately executed until you request elements from the generator.\n",
+      "\n",
+      "Find all the unique ways to make change for $1:"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "def squares(n=5):\n",
+      "    for i in xrange(1, n + 1):\n",
+      "        yield i ** 2\n",
+      "\n",
+      "# No code is executed\n",
+      "gen = squares()\n",
+      "\n",
+      "# Generator returns values lazily\n",
+      "for x in squares():\n",
+      "    print x"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "1\n",
+        "4\n",
+        "9\n",
+        "16\n",
+        "25\n"
+       ]
+      }
+     ],
+     "prompt_number": 10
     }
    ],
    "metadata": {}