[Python-ideas] Allow manual creation of DirEntry objects

[Brett Cannon]

On Tue, 16 Aug 2016 at 16:15 Victor Stinner <victor.stinner at gmail.com>
wrote:

> By the way, for all these reasons, I'm not really excited by Python
> 3.6 change exposing os.DirEntry ( https://bugs.python.org/issue27038
> ).
>

It was exposed at Guido's request for type hinting in typeshed.

-Brett


>
> Victor
>
> 2016-08-17 1:11 GMT+02:00 Victor Stinner <victor.stinner at gmail.com>:
> > 2016-08-16 23:13 GMT+02:00 Guido van Rossum <guido at python.org>:
> >> It sounds fine to just submit a patch to add and document the DirEntry
> >> constructor. I don't think anyone intended to disallow your use case,
> it's
> >> more likely that nobody thought of it.
> >
> > Currently, the DirEntry constructor expects data which comes from
> > opendir/readdir functions on UNIX/BSD or FindFirstFile/FindNextFile
> > functions on Windows. These functions are not exposed in Python, so
> > it's unlikely that you can get expected value. The DirEntry object was
> > created to avoid syscalls in the common case thanks to data provided
> > by these functions.
> >
> > But I guess that Brendan wants to create a DirEntry object which would
> > call os.stat() the first time that an attribute is read and then
> > benefit of the code. You loose the "no syscall" optimization, since at
> > least once syscall is needed.
> >
> > In this case, I guess that the constructor should be
> > DirEntry(directory, entry_name) where os.path.join(directory,
> > entry_name) is the full path.
> >
> > An issue is how to document the behaviour of DirEntry. Objects created
> > by os.scandir() would be "optimized", whereas objects created manually
> > would be "less optimized".
> >
> > DirEntry is designed for os.scandir(), it's very limited compared to
> > pathlib. IMO pathlib would be a better candidate for "cached os.stat
> > results" with a full API to access the file system.
> >
> > Victor
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