title: Tensorflow 2.0 - AttributeError: module 'tensorflow' has no attribute 'Session'
body: <p>When I am executing the command <code>sess = tf.Session()</code> in Tensorflow 2.0 environment, I am getting an error message as below:</p>
  <pre><code>Traceback (most recent call last):
  File &quot;&lt;stdin&gt;&quot;, line 1, in &lt;module&gt;
  AttributeError: module 'tensorflow' has no attribute 'Session'
  </code></pre>
  <blockquote>
  <p>System Information:</p>
  </blockquote>
  <ul>
  <li>OS Platform and Distribution: Windows 10</li>
  <li>Python Version: 3.7.1</li>
  <li>Tensorflow Version: 2.0.0-alpha0 (installed with pip)</li>
  </ul>
  <blockquote>
  <p>Steps to reproduce:</p>
  <p>Installation:</p>
  </blockquote>
  <ol>
  <li>pip install --upgrade pip</li>
  <li><strong>pip install tensorflow==2.0.0-alpha0</strong></li>
  <li>pip install keras</li>
  <li>pip install numpy==1.16.2</li>
  </ol>
  <blockquote>
  <p>Execution:</p>
  </blockquote>
  <ol>
  <li>Execute command: import tensorflow as tf</li>
  <li>Execute command: sess = tf.Session()</li>
  </ol>