title: Flask + Jinja: Pass Data to a Base Template/All Templates
body: <p>I have a method that returns data which is needed in my base template (content for a global footer).</p>
  
  <p>How do either (1) pass a variable into the base template (which other templates extend) or (2) pass a variable to all templates globally without explicitly adding it in a call to <code>render_template</code>?</p>