title: TypeError: run() missing 1 required positional argument: 'fetches' on Session.run()
body: <p>I'm new at tensorflow and I'm trying to follow <a href="https://www.tensorflow.org/get_started/get_started" rel="noreferrer">this</a> getting started tutorial. But executing this very simple code within "ex001.py" script:</p>
  
  <pre><code>import tensorflow as tf
  
  sess = tf.Session
  hello = tf.constant('Hello, TensorFlow!')
  print(hello)
  print(sess.run(hello))
  </code></pre>
  
  <p>I get the following output</p>
  
  <blockquote>
    <p>Tensor("Const:0", shape=(), dtype=string)
        Traceback (most recent call last):
          File "C:\Users\Giuseppe\Desktop\ex001.py", line 6, in 
            print(sess.run(hello))
        TypeError: run() missing 1 required positional argument: 'fetches'</p>
  </blockquote>
  
  <p>I've checked the <a href="https://www.tensorflow.org/api_docs/python/tf/Session#run" rel="noreferrer">tf.Session.run()</a> syntax but looks right and I didn't find anyone with the same issue.</p>
  
  <p>I'm running with this configuration:</p>
  
  <ul>
  <li>Windows 7 Professional sp1 64 bit</li>
  <li>Python 3.5.3 64 bit</li>
  <li>Tensorflow 1.0.1 cpu version</li>
  </ul>
  
  <p>Thanks in advance</p>