ImportError: No module named recsys.algorithm
<p>I'm trying to run the first code ("Movielens") in this site <a href="http://ocelma.net/software/python-recsys/build/html/examples.html" rel="nofollow">http://ocelma.net/software/python-recsys/build/html/examples.html</a> with the command (being in the same folder of ratings.dat):</p>

<pre><code>python movielens.py ratings.dat 80
</code></pre>

<p>but i don't understand why when i run it i receive this message in the terminal:</p>

<pre><code>  File "movielens.py", line 4, in &lt;module&gt;
    import recsys.algorithm
ImportError: No module named recsys.algorithm
</code></pre>