[Python-Dev] Keyword meanings [was: Accept just PEP-0426] (original) (raw)

Daniel Holth dholth at gmail.com
Thu Dec 6 16:23:20 CET 2012

On Thu, Dec 6, 2012 at 9:58 AM, Vinay Sajip <vinay_sajip at yahoo.co.uk> wrote:

Daniel Holth <dholth gmail.com> writes:

> The wheel implementation makes sure all the metadata (the .dist-info directory) > is at the end of the .zip archive. It's possible to read the metadata with a > single HTTP partial request for the end of the archive without downloading the > entire archive. Sounds good, but can you point to any example code which does this? As I understand it, for .zip files you have to read the last part of the file to get a pointer to the directory, then read that to find where each file in the archive is, then seek to a specific position to read the file contents.

You have to make a maximum of 3 requests: one for the directory pointer, one for the directory, and one for the file you want. It's not particularly difficult to make an HTTP-backed seekable file object to pass to ZipFile() for this purpose but I don't have an example. Normally the last few k of the file will contain all 3 pieces. 8k or 16k would be a good guess. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.python.org/pipermail/python-dev/attachments/20121206/db344a26/attachment.html>

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