toaster_json.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "import json\n",
    "import shlex\n",
    "import sys"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "This is what it looks like when you just dump json.\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "'{\"a \\\\\"quote\\\\\" in string\": \"hello\", \"wow\": 1}'"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "my_test = {'wow': 1, 'a \"quote\" in string': \"hello\"}\n",
    "print('This is what it looks like when you just dump json.')\n",
    "json.dumps(my_test)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "This is what it looks like when you escape the json correctly for the command line. Note that there are more escapes.\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'\\'{\"a \\\\\"quote\\\\\" in string\": \"hello\", \"wow\": 1}\\''"
      ]
     },
     "execution_count": 6,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "shlex.quote(json.dumps(my_test))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "'{\"a \\\"quote\\\" in string\": \"hello\", \"wow\": 1}'\n"
     ]
    }
   ],
   "source": [
    "print(shlex.quote(json.dumps(my_test)))"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "This is how you would probably end up parsing this\n",
    "\n",
    "You would invoke the command something like:\n",
    "\n",
    "```python3.4 -u test_file.py '{\"a \\\\\"quote\\\\\" in string\": \"hello\", \"wow\": 1}'```"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "{'a \"quote\" in string': 'hello', 'wow': 1}\n"
     ]
    }
   ],
   "source": [
    "# Pretend the sys_argv = sys.argv\n",
    "# Since I can't change the arguments here\n",
    "json_string_from_command_line = shlex.quote(json.dumps(my_test))\n",
    "sys_argv = ['test_file.py', shlex.split(json_string_from_command_line)[0]]\n",
    "\n",
    "\n",
    "loaded = json.loads(sys_argv[1])\n",
    "print(json.loads(sys_argv[1]))\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Look! You can now interact with a dictionary."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 15,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "1\n"
     ]
    }
   ],
   "source": [
    "print(loaded['wow'])"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  }
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