title: How to print flag descriptions in Tensorflow?
body: <p>Google has many examples that use flags.  They all have descriptions in the definition.  Is there a way I can print these descriptions out to the terminal?</p>
  
  <pre><code>flags = tf.app.flags
  FLAGS = flags.FLAGS
  flags.DEFINE_boolean('test_mode', False, 'This is the description I want A.')
  flags.DEFINE_boolean('cool_mode', True, 'This is the description I want B.')
  </code></pre>