Paul Moore <p.f.moore at gmail.com> writes: > In fact, the above strongly suggests to me that PEP 376 must NOT > follow setuptools conventions - otherwise, it will end up clashing > with the files setuptools is putting on my system. I think the argument for a separate ‘.pydist’ metadata directory, normative in PEP 376, is a good one. > > If so, I'd still prefer to keep the new metadata safely out of reach > > of the legacy package management systems that don't understand it, > > while having distutils retain the ability to generate a legacy > > ".egginfo" file to warn off the existing package management tools > > from installing the same distribution again. > > So for a minimal case of a single .py file packaged up as a > distribution, we now have the .py file, a legacy .egginfo file, a new > .pydist directory containing RECORD and PKG-INFO files? > > That's getting silly. The burden of switching is that we need a compatibility bridge. If that means that a tool must support the old while also supporting the new, that's not silliness in the tool, but acknowledgement of the silliness we're migrating away from. That doesn't mean, though, that PEP 376 needs to mention the old format at all; just that distutils should support it, deprecated, until a time when it's deemed safe to remove. In fact, I think it's best that PEP 376 discuss *only* the format we're trying to migrate to, and support for existing formats is firmly outside its scope. > And yet, given that PEP 376 is explicitly being designed with a goal > being to act as the common standard that *all* package management > formats can use, is it not the whole point that once it's defined and > we have achieved consensus, existing package managers will switch to > using it rather than retaining a range of custom formats? Again, that needs to be a gradual process. Supporting a new format as defined in PEP 376 needs not (indeed, I would argue *should* not) mean the tool drop support for old formats immediately. There needs to be a compatibility chain to allow for fast migration *and* slow migration, since there will be a broad mix of both. Let PEP 376 discuss a format that is clean and new, but let discussions leading to that format acknowledge that it must allow (*not* require) parallel support of old formats for some time. -- \ “I love to go down to the schoolyard and watch all the little | `\ children jump up and down and run around yelling and screaming. | _o__) They don't know I'm only using blanks.” —Emo Philips | Ben Finney
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