Éric Araujo <[email protected]> added the comment:
> As far as I've been able to tell there is no proposed syntax in the docs
> specifically for
> package_data.
Right. I’ve only found an example in d2’s own setup.cfg:
package_data =
distutils2._backport = sysconfig.cfg
distutils2.command = wininst*.exe
distutils2.tests = xxmodule.c
(Note that there’s a bug in build_py or config so you can’t test this right
now.)
> The docs for the resources option seems to suggest separating globs with
> spaces, which would
> be fine by me (wouldn't allow paths that contain spaces, but that's a bad
> idea anyways).
Agreed.
> I think that allowing one glob string on each line is more readable
Definitely.
> Another possibility would be to allow line breaks in the value [...]
> But that's getting a little more complex syntax-wise.
Truly!
> Agreed on getting rid of data_files--it's dangerous.
Actually the resources system redefines data_files (it was even called
datafiles.py and DATAFILES at one time, and it’s still handled by install_data;
I think that was a better naming scheme). distutils-style data_files were
practically unusable: System packagers were unhappy because they wanted to
control the location of installed files, Python authors were unhappy because
they could not access the files from their code. I think that’s why
package_data took off.
> But package_data I find very useful sometimes, and I don't think it's always
> wrong.
OS maintainers like the Debian project strongly disagree :)
> At the very least, it's not clear to me how the above use case is intended to
> be replaced.
The point of resources is that it redefines data_files and is as easy to use as
package_data. If you have for example a project named Spam with a Python
package spamlib and a file in templates/log.txt, your code just needs to do
this:
from packaging.database import get_file
with get_file('Spam', 'templates/log.txt') as fp:
...
When run from an uninstalled checkout, for example when developing, the file
will be found in the checkout. When run after being installed on a Debian
system, the file will be found in /usr/local/share/spam/templates/log.txt.
Each Python installation can decide (through sysconfig.cfg) where to install
things.
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