title: Python_io in tensorflow
body: <p>I'm having trouble working with tensorflow. I want to use <code>TFRecordWriter()</code> as below:</p>
  
  <pre><code>with tf.python_io.TFRecordWriter(testing_filename) as tfrecord_writer:
      # do sth
  </code></pre>
  
  <p>but I get the error:</p>
  
  <blockquote>
    <p>AttributeError: module 'tensorflow' has no attribute 'python_io'</p>
  </blockquote>
  
  <p>I'm working with tensorflow 1.2 and python 3.</p>
  
  <p>How can I fix the problem?</p>
  
  <p>Thanks.</p>