title: Cannot print value of a Tensor
body: <p>I am new to Tensorflow. I have seen tutorials and some other questions here. However, there is something wrong and I don't understand why (I am still not exactly sure about how tf works).</p>
  
  <p>I have this code (I have tried few other options, but the result was always the same):</p>
  
  <pre><code>filename_queue = tf.train.string_input_producer(["exoTrain.csv"])
  features, label = read_from_file(filename_queue) 
  testSess = tf.Session()
  init = tf.global_variables_initializer()
  testSess.run(init)
  print(testSess.run(features))
  testSess.close()
  </code></pre>
  
  <p>where <code>features</code> is a <code>tf.stack</code>: <code>Tensor("stack:0", shape=(3197,), dtype=float32)</code></p>
  
  <p>This code does not print anything. And, actually, it just gets stuck, and I have to manually stop it.</p>
  
  <p>Why it is not terminating properly and why it is not printing?</p>