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POHow to determine number of files on a drive with Python?
 

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  1. POHow to determine number of files on a drive with Python?
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    <p>I have been trying to figure out how to retrieve (quickly) the number of files on a given HFS+ drive with python.</p> <p>I have been playing with os.statvfs and such, but can't quite get anything (that seems helpful to me).</p> <p>Any ideas?</p> <p><strong>Edit:</strong> Let me be a bit more specific. =]</p> <p>I am writing a timemachine-like wrapper around rsync for various reasons, and would like a very fast estimate (does not have to be perfect) of the number of files on the drive rsync is going to scan. This way I can watch the progress from rsync (if you call it like <code>rsync -ax --progress</code>, or with the <code>-P</code> option) as it builds its initial file list, and report a percentage and/or ETA back to the user.</p> <p>This is completely separate from the actual backup, which is no problem tracking progress. But with the drives I am working on with several million files, it means the user is watching a counter of the number of files go up with no upper bound for a few minutes.</p> <p>I have tried playing with os.statvfs with exactly the method described in one of the answers so far, but the results do not make sense to me.</p> <pre><code>&gt;&gt;&gt; import os &gt;&gt;&gt; os.statvfs('/').f_files - os.statvfs('/').f_ffree 64171205L </code></pre> <p>The more portable way gives me around 1.1 million on this machine, which is the same as every other indicator I have seen on this machine, including rsync running its preparations:</p> <pre><code>&gt;&gt;&gt; sum(len(filenames) for path, dirnames, filenames in os.walk("/")) 1084224 </code></pre> <p>Note that the first method is instantaneous, while the second one made me come back 15 minutes later to update because it took just that long to run.</p> <p>Does anyone know of a similar way to get this number, or what is wrong with how I am treating/interpreting the os.statvfs numbers?</p>
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    1. COHow does the output of os.statvfs[os.B_FILES] vary from what you expect? (If you could paste sample output from os.statvfs and explain *why* it isn't helpful, that would help people who don't know OS X to help you).
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      1. POHow to determine number of files on a drive with Python?
      1. USCharles Duffy
    2. CO@Charles: I have updated my question with some actual details now...
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    3. COYou could use a number from a previous rsync run. It is quick, portable, and for 10**6 files and any reasonable backup strategy it will give you 1% or better precision.
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