title: What is the static_path parameter in Flask.__init__?
body: <p>The signature of <code>Flask.__init__</code> has a <code>static_path</code> parameter, but it's not documented. What does that parameter do?</p>
  
  <pre><code>class Flask(
      import_name,
      static_path=None, static_url_path=None, static_folder='static',
      template_folder='templates',
      instance_path=None, instance_relative_config=False, root_path=None
  )
  </code></pre>