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      "[Python for Developers](http://ricardoduarte.github.io/python-for-developers/#content)\n",
      "===================================\n",
      "First Edition\n",
      "-----------------------------------\n",
      "\n",
      "Chapter 10: Packages\n",
      "=============================\n",
      "_____________________________\n",
      "Packages are folders that are identified by the interpreter by the presence of a file named `__init__.py`. Packages work as collections to organize modules hierarchically.\n",
      "\n",
      "![Package](files/bpyfd_diags8.png)\n",
      "\n",
      "You can import all package modules  using the statement `from packagename import *`.\n",
      "\n",
      "The `__init__.py` file can be empty or contain package initialization code or define a variable called `__all__`, a list of modules of the package that will be imported when using \"*\". Without the file, Python does not recognize the folder as a valid packet."
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