title: Python unclosed resource: is it safe to delete the file?
body: <p>Googled my way around this issue, but didn't find any solutions. I'm running Python 3.3 with Eclipse and PyDev plugin, and when I run any Python project, I get the following message:</p>
  
  <pre><code>/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/site-packages/update_checker.py:37: ResourceWarning: unclosed file &lt;_io.BufferedReader name='/var/folders/x4/st67yr0x6qg7znh7sdfr94kh0000gn/T/update_checker_cache.pkl'&gt;
    permacache = pickle.load(open(filename, 'rb'))
  </code></pre>
  
  <p>I'm kind of new to Python, and I have no idea what this means. I wanted to ask before deleting this to make sure it's safe to delete. What does this even mean? I get there's an open file... but why is Python complaining to me? I'm using the PRAW library, if that makes any difference.</p>
  
  <p><strike>Update: My code is <a href="https://github.com/Mgamerz/Fresh-Set-of-Images" rel="noreferrer">here on sourceforge</a>,</strike> but it doens't reliably come up with the error (tried on 2 different computers). Once the error comes up, it never goes away.</p>