Re: Make a unique filesystem path, without creating the file

From	Gregory Ewing <greg.ewing@canterbury.ac.nz>
Newsgroups	comp.lang.python
Subject	Re: Make a unique filesystem path, without creating the file
Date	2016-02-15 21:11 +1300
Message-ID	<didfgnFt6ivU1@mid.individual.net> (permalink)
References	(1 earlier) <CAG93HwHjKewu-VHUUc1jL=cU-pDNxVtKxx6ORyr+mdLLSJx2TA@mail.gmail.com> <CAG93HwGRsvcc=9rGgOA=oi6C-3pTk-Kr3g4dxCN0ivvixTVPWw@mail.gmail.com> <mailman.121.1455494940.22075.python-list@python.org> <56c14ed7$0$11089$c3e8da3@news.astraweb.com> <mailman.127.1455510515.22075.python-list@python.org>

Show all headers | View raw

Ben Finney wrote:

> The existing behaviour of ‘tempfile.mktemp’ – actually of its internal
> class ‘tempfile._RandomNameSequence’ – is to generate unpredictable,
> unique, valid filesystem paths that are different each time.

But that's not documented behaviour, so even if mktemp()
weren't marked as deprecated, you'd still be relying on
undocumented and potentially changeable behaviour.

> What I'm
> looking for is a way to use it (not re-implement it) that is public API
> and isn't scolded by the library documentation.

Then you're looking for something that doesn't exist,
I'm sorry to say, and it's unlikely you'll persuade
anyone to make it exist.

If you want to leverage stdlib functionality for this,
I'd suggest something along the lines of:

   def fakefilename(dir, ext):
     return os.path.join(dir, str(uuid.uuid4())) + ext

-- 
Greg

Thread

Re: Make a unique filesystem path, without creating the file Ben Finney <ben+python@benfinney.id.au> - 2016-02-15 11:08 +1100
  Re: Make a unique filesystem path, without creating the file Dan Sommers <dan@tombstonezero.net> - 2016-02-15 01:07 +0000
    Re: Make a unique filesystem path, without creating the file Ben Finney <ben+python@benfinney.id.au> - 2016-02-15 12:19 +1100
      Re: Make a unique filesystem path, without creating the file Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2016-02-15 15:54 +1100
        Re: Make a unique filesystem path, without creating the file Ben Finney <ben+python@benfinney.id.au> - 2016-02-15 16:25 +1100
        Re: Make a unique filesystem path, without creating the file Rick Johnson <rantingrickjohnson@gmail.com> - 2016-02-15 18:26 -0800
      Re: Make a unique filesystem path, without creating the file Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2016-02-15 21:00 +1300
        Re: Make a unique filesystem path, without creating the file Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-02-16 01:18 +0100
      Re: Make a unique filesystem path, without creating the file Grant Edwards <invalid@invalid.invalid> - 2016-02-15 15:49 +0000
  Re: Make a unique filesystem path, without creating the file Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2016-02-15 15:06 +1100
    Re: Make a unique filesystem path, without creating the file Ben Finney <ben+python@benfinney.id.au> - 2016-02-15 15:28 +1100
      Re: Make a unique filesystem path, without creating the file Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2016-02-15 21:11 +1300
      Re: Make a unique filesystem path, without creating the file Nobody <nobody@nowhere.invalid> - 2016-02-16 02:14 +0000
    Re: Make a unique filesystem path, without creating the file "Martin A. Brown" <martin@linux-ip.net> - 2016-02-14 20:48 -0800

csiph-web