No module named __future__
<p>I have error as <code>No module named __future__</code>.
I use tensorflow and it has Python2.7.
Once I run a program, I got error as shown below.</p>

<pre><code>import tensorflow
Traceback (most recent call last):
  File "&lt;stdin&gt;", line 1, in &lt;module&gt;
  File "/home/coie/tensorflow/local/lib/python2.7/site-packages/tensorflow/__init__.py", line 19, in &lt;module&gt;
    from __future__ import absolute_import
ImportError: No module named __future__
</code></pre>

<p>How to install <strong>future</strong> into tensorflow's Python?</p>