Added files IPython Notebook containing common file snippets.

core/files.ipynb

@@ -0,0 +1,122 @@
+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:c7a4bcb2e55f64b6c49581b50c190fa5f6742f215ee7c4e3a6d10b11319a56fb"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "# Files\n",
+      "\n",
+      "* Open a File for Reading\n",
+      "* Read a File\n",
+      "* Write to a New File"
+     ]
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "## Open a File for Reading\n",
+      "\n",
+      "Open a file in read-only mode:"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "path = 'type_util.py'\n",
+      "f = open(path)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "## Read a File\n",
+      "\n",
+      "Read the entire file with readlines.  Iterate over the file lines as you would with a list.  rstrip removes the EOL markers."
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "for line in f:\n",
+      "    print(line.rstrip())"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "class TypeUtil:\n",
+        "\n",
+        "    @classmethod\n",
+        "    def is_iterable(cls, obj):\n",
+        "        \"\"\"Determines if obj is iterable.\n",
+        "\n",
+        "        Useful when writing functions that can accept multiple types of\n",
+        "        input (list, tuple, ndarray, iterator).  Pairs well with\n",
+        "        convert_to_list.\n",
+        "        \"\"\"\n",
+        "        try:\n",
+        "            iter(obj)\n",
+        "            return True\n",
+        "        except TypeError:\n",
+        "            return False\n",
+        "\n",
+        "    @classmethod\n",
+        "    def convert_to_list(cls, obj):\n",
+        "        \"\"\"Converts obj to a list if it is not a list and it is iterable,\n",
+        "        else returns the original obj.\n",
+        "        \"\"\"\n",
+        "        if not isinstance(obj, list) and cls.is_iterable(obj):\n",
+        "            obj = list(obj)\n",
+        "        return obj\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "## Write to a New File\n",
+      "\n",
+      "Create a new file (overwriting any previous file with the same name), write text then close the file:"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "path = 'hello_world.txt'\n",
+      "f = open(path, 'w')\n",
+      "f.write('hello world!')\n",
+      "f.close()"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [],
+     "prompt_number": 3
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}

core/hello_world.txt

@@ -0,0 +1 @@
+hello world!