title: TensorFlow, "'module' object has no attribute 'placeholder'"
body: <p>I've been trying to use tensorflow for two days now installing and reinstalling it over and over again in python2.7 and 3.4.  No matter what I do, I get this error message when trying to use tensorflow.placeholder()</p>
  
  <p>It's very boilerplate code:</p>
  
  <pre><code>tf_in = tf.placeholder("float", [None, A]) # Features
  </code></pre>
  
  <p>No matter what I do I always get the trace back:</p>
  
  <pre><code>Traceback (most recent call last):
    File "/home/willim/PycharmProjects/tensorflow/tensorflow.py", line 2, in &lt;module&gt;
      import tensorflow as tf
    File "/home/willim/PycharmProjects/tensorflow/tensorflow.py", line 53, in &lt;module&gt;
      tf_in = tf.placeholder("float", [None, A]) # Features
  AttributeError: 'module' object has no attribute 'placeholder'
  </code></pre>
  
  <p>Anyone know how I can fix this?</p>