title: Placing metadata like __title__, __author__, __version__ etc in __init__.py
body: <p>In some templates and code examples of Python modules, I see that the <code>__init__.py</code> files contain variable declarations like these:</p>
  
  <pre><code>__title__ = 'example'
  __version__ = '1.0.0'
  __author__ = 'Just Me'
  __license__ = 'MIT'
  __copyright__ = 'Copyright 2016 by Me'
  </code></pre>
  
  <p>I could not find any official documentation mentioning them though.</p>
  
  <p>Do those declarations have any effect, e.g. when packaging and distributing the module, or are these values basically equal to comments?</p>
  
  <p>Should I add any of them to my projects, is this considered good style? Which ones? Is there a complete list of standardized variables like those?</p>