From adc16ceddb938d31f733b81fd4974da796809b08 Mon Sep 17 00:00:00 2001
From: Donne Martin <donne.martin@gmail.com>
Date: Sun, 25 Jan 2015 06:52:00 -0500
Subject: [PATCH] Added IPython Notebook for data structures, starting with
 snippets for tuples.

---
 core/structs.ipynb | 267 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 267 insertions(+)
 create mode 100644 core/structs.ipynb

diff --git a/core/structs.ipynb b/core/structs.ipynb
new file mode 100644
index 0000000..ec3d283
--- /dev/null
+++ b/core/structs.ipynb
@@ -0,0 +1,267 @@
+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:3a81774c42cd506eb4c0d4a364178d879dabd4791d93008c2f967309d872bd37"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "# Data Structures"
+     ]
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "## Tuples"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# One dimensional, fixed-length, immutable sequence\n",
+      "tup = (1, 2, 3)\n",
+      "tup"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "metadata": {},
+       "output_type": "pyout",
+       "prompt_number": 46,
+       "text": [
+        "(1, 2, 3)"
+       ]
+      }
+     ],
+     "prompt_number": 46
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "list_x = [1, 2, 3]"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [],
+     "prompt_number": 47
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Convert to a tuple\n",
+      "type(tuple(list_x))"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "metadata": {},
+       "output_type": "pyout",
+       "prompt_number": 48,
+       "text": [
+        "tuple"
+       ]
+      }
+     ],
+     "prompt_number": 48
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Nested tuples\n",
+      "nested_tup = ([1, 2, 3], (4, 5))\n",
+      "nested_tup"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "metadata": {},
+       "output_type": "pyout",
+       "prompt_number": 56,
+       "text": [
+        "([1, 2, 3], (4, 5))"
+       ]
+      }
+     ],
+     "prompt_number": 56
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Access by index\n",
+      "nested_tup[0]"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "metadata": {},
+       "output_type": "pyout",
+       "prompt_number": 57,
+       "text": [
+        "[1, 2, 3]"
+       ]
+      }
+     ],
+     "prompt_number": 57
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Although tuples are immutable, their contents can contain mutable objects\n",
+      "nested_tup[0].append(4)\n",
+      "nested_tup[0]"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "metadata": {},
+       "output_type": "pyout",
+       "prompt_number": 58,
+       "text": [
+        "[1, 2, 3, 4]"
+       ]
+      }
+     ],
+     "prompt_number": 58
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Concatenate tuples with +\n",
+      "(1, 3, 2) + (4, 5, 6)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "metadata": {},
+       "output_type": "pyout",
+       "prompt_number": 59,
+       "text": [
+        "(1, 3, 2, 4, 5, 6)"
+       ]
+      }
+     ],
+     "prompt_number": 59
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Multiply copies references to objects (objects themselves are not copied)\n",
+      "('foo', 'bar') * 2"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "metadata": {},
+       "output_type": "pyout",
+       "prompt_number": 60,
+       "text": [
+        "('foo', 'bar', 'foo', 'bar')"
+       ]
+      }
+     ],
+     "prompt_number": 60
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Unpack tuples\n",
+      "a, b = nested_tup\n",
+      "a, b"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "metadata": {},
+       "output_type": "pyout",
+       "prompt_number": 66,
+       "text": [
+        "([1, 2, 3, 4], (4, 5))"
+       ]
+      }
+     ],
+     "prompt_number": 66
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Unpack nested tuples\n",
+      "(a, b, c, d), (e, f) = nested_tup\n",
+      "a, b, c, d, e, f"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "metadata": {},
+       "output_type": "pyout",
+       "prompt_number": 68,
+       "text": [
+        "(1, 2, 3, 4, 4, 5)"
+       ]
+      }
+     ],
+     "prompt_number": 68
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# A common use of variable unpacking is when iterating over sequences\n",
+      "# of tuples or lists\n",
+      "seq = [( 1, 2, 3), (4, 5, 6), (7, 8, 9)] \n",
+      "for a, b, c in seq: \n",
+      "    print(a, b, c)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "(1, 2, 3)\n",
+        "(4, 5, 6)\n",
+        "(7, 8, 9)\n"
+       ]
+      }
+     ],
+     "prompt_number": 72
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [],
+     "language": "python",
+     "metadata": {},
+     "outputs": []
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
\ No newline at end of file