title: While debugging, how to print all variables (which is in list format) who are trainable in Tensorflow?
body: <p>While debugging, how to print all variables (which is in list format) who are trainable in Tensorflow?</p>
  
  <p>For instance,</p>
  
  <pre><code>    tvars = tf.trainable_variables()
  </code></pre>
  
  <p>I want to check all the variables in tvars (which is list type).</p>
  
  <p>I've already tried the below code which returns error,</p>
  
  <pre><code>    myvars = session.run([tvars])
      print(myvars)
  </code></pre>