My setup-requires wrapper, adding pre-setup.py dependency installation to setup.py, relies on this feature. It needs to install something in a directory that is only added to PYTHONPATH during the installation and does not interfere with the normal environment.
On Fri, Feb 12, 2016 at 9:55 AM Steve Dower email@example.com wrote:
I was also planning to use it in an upcoming project that has to "do its own" package management. The aim was to install different versions of packages in different directories and use sys.path modifications to resolve them at runtime (kind of like what setuptools did in the older days).
An alternative would be great, though I can probably fake things somehow for my purposes.
Top-posted from my Windows Phone
From: Vinay Sajip firstname.lastname@example.org Sent: 2/11/2016 15:18 To: Distutils-Sig@Python.Org Subject: Re: [Distutils] deprecating pip install --target
Robert Collins <robertc <at> robertcollins.net> writes:
This is fairly broken - it doesn't handle platlib vs purelib (see pip PR 3450), doesn't handle data files, or any other layout. Donald says pip uses it to maintain the _vendor subtrees only, which doesn't seem like a particularly strong use case.
Certainly the help description for it is misleading - since what we're actually doing is copying only a subset of what the package installed
- so at a minimum we need to be much clearer about what it does.
But, I think it would be better to deprecate it and remove it... so I'm pinging here to see if anyone can explain a sensible use case for it in the context of pip :)
I use it in pretty much the same way as Paul mentioned - I wouldn't like it to go unless something equivalent is available. Updating the help / documentation for it to better reflect what it does would be uncontroversial for me, but I see no strong reason for deprecation and removal. As Paul suggests, it can get stricter about what it'll handle.
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