Surely getting farther away from python by trying to prohibit useless makers just makes the implementation needlessly complex. On Apr 27, 2013 11:13 AM, "Nick Coghlan" <[email protected]> wrote:
> On Sun, Apr 28, 2013 at 12:47 AM, PJ Eby <[email protected]> wrote: > > On Sat, Apr 27, 2013 at 5:46 AM, Vinay Sajip <[email protected]> > wrote: > >> At the moment, distlib > >> allows expressions like "python_version >= '2.6'" or "python_version < > '3.5'" > >> which are also not mentioned in the PEP. I don't recall seeing any > discussion > >> around why allowing inequalities might be a bad idea, but perhaps > someone > >> can point me to it? Perhaps it should be mentioned in the PEP. > > > > I don't know of any reasons myself. Perhaps it was thought that > > restricting the syntax would make it easier to implement? For Python, > > that's not especially true. > > I don't know for sure either - I pretty much inherited it as is from > PEP 345, and otherwise haven't messed with it. I already have a note > in the next draft saying that we might want access to the version > specifier comparisons to make it easier to place constraints on the > Python version. > > > The marker syntax has some other annoying quirks that make it more > > difficult to implement and weird to spell, anyway, like mixing actual > > things ('sys.platform') with non-real things (e.g. 'platform.machine' > > that's really 'platform.machine()'). It would make a lot more sense > > (and simplify implementations) to just say 'platform_machine' or even > > 'machine' in the first place. > > > > OTOH, I hope that we can finalize at least the environment marker > > syntax pronto, so I don't end up with a dead-end version of the > > syntax. > > I have my hands full with other aspects of the PEP 426 update, but if > you and Vinay want to thrash out a modified version of the environment > marker syntax (such as always using underscores for names which don't > correspond directly to usable Python expressions), I'd certainly be > willing to consider it. It's pretty decoupled from the rest of the > PEP, which just says in a couple of places "environment marker strings > can go here", and then defines the syntax for them once. > > Cheers, > Nick. > > -- > Nick Coghlan | [email protected] | Brisbane, Australia > _______________________________________________ > Distutils-SIG maillist - [email protected] > http://mail.python.org/mailman/listinfo/distutils-sig >
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