On 23 Jul 2013 05:53, "Carl Meyer" <c...@oddbird.net> wrote: > > On 07/22/2013 06:31 AM, Daniel Holth wrote: > > Yes, extras are *only* a way to create aliases for a set of > > dependencies. They are not recorded as installed. It should make no > > difference whether you install ipython[notebook], look up the > > dependencies for the ipython notebook and install them manually, or > > happen to have the ipython[notebook] dependencies installed and then > > later install ipython itself. > > In the broad view I don't think this is true, when you consider > uninstall. If I install ipython[notebook] and later uninstall ipython, > it would be reasonable for the uninstaller to prompt me to uninstall all > the ipython notebook dependencies by default, whereas it should not do > so if I had installed them separately and directly. > > That said, the REQUESTED flag in PEP 376 is probably sufficient for > this, so it may still be true that there's no need to store which extras > were installed with a package.
The safest logic for that kind of garbage collection feature is currently: * was it explicitly requested? * if not, does anything else (extra or not) still depend on it? Tracking extra requests directly currently falls into YAGNI territory in my opinion - if people want that level of control, then they really have a separate distribution rather than an extra. Cheers, Nick. > > Carl > > > _______________________________________________ > Distutils-SIG maillist - Distutils-SIG@python.org > http://mail.python.org/mailman/listinfo/distutils-sig >
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