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    <p>Instead of </p> <pre><code>if not os.path.exists(self.cache_location): os.mkdir(self.cache_location) </code></pre> <p>you could do</p> <pre><code>try: os.makedirs(self.cache_location) except OSError: pass </code></pre> <p>As you would end up with the same <em>functionality</em>.</p> <p><sub>DISCLAIMER: I don't know how Pythonic this might be.</sub></p> <hr> <p>Using <code>SQLite3</code>, <em>might</em> be a bit of overkill, but would add a <em>lot</em> of functionality and flexibility to your use case.</p> <p>If you have to do a lot of "selecting", concurrent inserting and filtering, it's a great idea to use <code>SQLite3</code>, as it wont add too much complexity over simple files (it could be argued that it removes complexity).</p> <hr> <p>Rereading your question (and comments) I can better understand your problem.</p> <p>What is the possibility that a <strong>file</strong> could create the same race condition?</p> <p>If it is small enough, then I'd do something like:</p> <pre><code>if not os.path.isfile(self.cache_location): try: os.makedirs(self.cache_location) except OSError: pass </code></pre> <p>Also, reading your code, I'd change </p> <pre><code>else: # Our target dir is already a file, or different error, # relay the error! raise OSError(e) </code></pre> <p>to</p> <pre><code>else: # Our target dir is already a file, or different error, # relay the error! raise </code></pre> <p>as it's really what you want, Python to reraise the exact same exception <sub>(just nitpicking)</sub>.</p> <hr> <p>One more thing, may be <a href="https://stackoverflow.com/questions/1474052/synchronize-shell-script-execution" title="Synchronize shell script execution">this</a> could be of use for you (Unix-like only).</p>
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    1. PORace-condition creating folder in Python
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    1. CO+1: It's perfectly Pythonic, IMO.
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    2. COAgreed, though you might consider using `os.makedirs` instead, which create parent directories as well, if necessary.
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    3. CO@Eli Courtwright: good point. Modified.
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