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    "- .pyc means compiled .py code.\n",
    "    - In 3.2 and later, there compiled code are saved in `__pycache__`.\n",
    "    - It's for `startup optimization`. Python will load these .pyc files and skip compilation.\n",
    "    - Note that Python byte code is not binary machine code. Instead, it's a Python-spcific representation."
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    "- Other Python Implementation\n",
    "    - Jython : Java\n",
    "    - IronPython : .NET\n",
    "    - Stackless : concurrency\n",
    "    - PyPy : speed (still Python 2 only)\n",
    "    - Cython : integrate with C"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "- Frozen  Binaries -> release exe\n",
    "    - py2exe : windows\n",
    "    - PyInstaller\n",
    "    - py2app : Mac\n",
    "    - cx_freeze : Python 3"
   ]
  }
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