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Thu May 12 00:32:21 EDT 2016 · https://mail.python.org/pipermail/python-dev/2016-May/144536.html

On 11.05.16 23:51, Ethan Furman wrote:
> On 05/11/2016 01:44 PM, Serhiy Storchaka wrote:
>> I afraid that this will hit a performance. Some os.path functions are
>> used in tight loops, they are hard optimized, and adding support of path
>> protocol can have visible negative effect.
>
> Do you have an example of os.path functions being used in a tight loop?

posixpath.realpath(), os.walk(), glob.glob() calls split() and join() 
for every path component. dirname() and basename() are also often 
called. I doesn't count functions like islink() and isfile() since they 
just pass the argument to underlying stat function and don't need 
conversion.

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[Python-Dev] file system path protocol PEP