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    "from __future__ import print_function\n",
    "from distutils.version import LooseVersion as Version\n",
    "import sys\n",
    "\n",
    "\n",
    "try:\n",
    "    import curses\n",
    "    curses.setupterm()\n",
    "    assert curses.tigetnum(\"colors\") > 2\n",
    "    OK = \"\\x1b[1;%dm[ OK ]\\x1b[0m\" % (30 + curses.COLOR_GREEN)\n",
    "    FAIL = \"\\x1b[1;%dm[FAIL]\\x1b[0m\" % (30 + curses.COLOR_RED)\n",
    "except:\n",
    "    OK = '[ OK ]'\n",
    "    FAIL = '[FAIL]'\n",
    "\n",
    "try:\n",
    "    import importlib\n",
    "except ImportError:\n",
    "    print(FAIL, \"Python version 3.4 (or 2.7) is required,\"\n",
    "                \" but %s is installed.\" % sys.version)\n",
    "\n",
    "    \n",
    "def import_version(pkg, min_ver, fail_msg=\"\"):\n",
    "    mod = None\n",
    "    try:\n",
    "        mod = importlib.import_module(pkg)\n",
    "        if pkg in {'PIL'}:\n",
    "            ver = mod.VERSION\n",
    "        else:\n",
    "            ver = mod.__version__\n",
    "        if Version(ver) < min_ver:\n",
    "            print(FAIL, \"%s version %s or higher required, but %s installed.\"\n",
    "                  % (lib, min_ver, ver))\n",
    "        else:\n",
    "            print(OK, '%s version %s' % (pkg, ver))\n",
    "    except ImportError:\n",
    "        print(FAIL, '%s not installed. %s' % (pkg, fail_msg))\n",
    "    return mod\n",
    "\n",
    "\n",
    "# first check the python version\n",
    "print('Using python in', sys.prefix)\n",
    "print(sys.version)\n",
    "pyversion = Version(sys.version)\n",
    "if pyversion >= \"3\":\n",
    "    if pyversion < \"3.4\":\n",
    "        print(FAIL, \"Python version 3.4 (or 2.7) is required,\"\n",
    "                    \" but %s is installed.\" % sys.version)\n",
    "elif pyversion >= \"2\":\n",
    "    if pyversion < \"2.7\":\n",
    "        print(FAIL, \"Python version 2.7 is required,\"\n",
    "                    \" but %s is installed.\" % sys.version)\n",
    "else:\n",
    "    print(FAIL, \"Unknown Python version: %s\" % sys.version)\n",
    "\n",
    "print()\n",
    "requirements = {'numpy': \"1.6.1\", 'scipy': \"0.9\", 'matplotlib': \"1.0\",\n",
    "                'IPython': \"3.0\", 'sklearn': \"0.15\",\n",
    "                'watermark': \"1.3.1\",\n",
    "                'yaml': \"3.11\", 'PIL': \"1.1.7\"}\n",
    "\n",
    "# now the dependencies\n",
    "for lib, required_version in list(requirements.items()):\n",
    "    import_version(lib, required_version)\n",
    "\n",
    "# pydot is a bit different\n",
    "import_version(\"pydot\", \"0\", fail_msg=\"pydot is not installed.\"\n",
    "               \"It is not required but you will miss out on some plots.\"\n",
    "               \"\\nYou can install it using \"\n",
    "               \"'pip install pydot' on python2, and 'pip install \"\n",
    "               \"git+https://github.com/nlhepler/pydot.git' on python3.\");\n"
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