title: how to fix : module 'tensorflow' has no attribute 'Session'
body: <pre><code>import tensorflow as tf
  a=tf.constant(2)
  b=tf.constant(3)
  c=a+b
  sess=tf.Session(c)
  sess.run()
  </code></pre>
  
  <p>I got the error message module 'tensorflow' has no attribute 'Session'</p>