title: Flask-Session extension vs default session
body: <p>I'm using:</p>
  
  <pre><code>from flask import session
  
  @app.route('/')
  def main_page():
      if session.get('key'):
          print ("session exist" + session.get('key'))
      else:
          print ("could not find session")
          session['key'] = '34544646###########'
      return render_template('index.html')
  </code></pre>
  
  <p>I don't have the Flask-Session extension installed but this still works fine. I'm trying to understand why and when is that extension imp to me. As far as I see, the default session works well for me.</p>