{
 "metadata": {
  "name": "",
  "signature": "sha256:8cab3af0436792a4e51bc7dd2a1f3571914e22c494780a0b38e82513faf7e122"
 },
 "nbformat": 3,
 "nbformat_minor": 0,
 "worksheets": [
  {
   "cells": [
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "a=1         # Some variables used by our later cell\n",
      "z=\"hi\"\n",
      "y=True\n",
      "x = 6\n",
      "u = 4\n",
      "import sys"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 1
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "Install and load the cell2function extension:"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "%install_ext https://raw.github.com/takluyver/cell2function/master/cell2function.py"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Installed cell2function.py. To use it, type:\n",
        "  %load_ext cell2function\n"
       ]
      }
     ],
     "prompt_number": 2
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "%load_ext cell2function"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 3
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "Now we put the `%%cell2function` magic at the top of the cell we want to transform:"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "%%cell2function\n",
      "b=2\n",
      "def subfunc(c=1, d=z):\n",
      "    e = 99\n",
      "    print(y)\n",
      "a = a*2\n",
      "x += 1\n",
      "print(sys.version)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 4
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "The result is a function in a new cell. Any variables needed by the cell are parameters, and any variables defined are return values. You can now cut this down."
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "def unnamed(z, y, a, x):\n",
      "    b=2\n",
      "    def subfunc(c=1, d=z):\n",
      "        e = 99\n",
      "        print(y)\n",
      "    a = a*2\n",
      "    x += 1\n",
      "    print(sys.version)\n",
      "    return b, subfunc, a, x\n",
      "\n",
      "b, subfunc, a, x = unnamed(z, y, a, x)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "You can also give create the function with a name:"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "%%cell2function square\n",
      "squared = a**2"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 5
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "def square(a):\n",
      "    squared = a**2\n",
      "    return squared\n",
      "\n",
      "squared = square(a)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": []
    }
   ],
   "metadata": {}
  }
 ]
}