On Wed, Jun 15, 2016 at 10:15 PM, Brett Cannon <[email protected]> wrote: > > > On 2016年6月15日 at 12:12 Koos Zevenhoven <[email protected]> wrote: >> >> >> if isinstance(filename, os.PathLike): >> >> By the way, regarding the line of code above, is there a convention >> regarding whether implementing some protocol/interface requires >> registering with (or inheriting from) the appropriate ABC for it to >> work in all situations. IOW, in this case, is it sufficient to >> implement __fspath__ to make your type pathlike? Is there a conscious >> trend towards requiring the ABC? > > > ABCs like os.PathLike can override __subclasshook__ so that registration > isn't required (see > https://hg.python.org/cpython/file/default/Lib/os.py#l1136). So registration > is definitely good to do to be explicit that you're trying to meet an ABC, > but it isn't strictly required.
Ok I suppose that's fine, so I propose we update the ABC part in the PEP with __subclasshook__. And the other question could be turned into whether to make str and bytes also PathLike in __subclasshook__. -- Koos -- + Koos Zevenhoven + http://twitter.com/k7hoven + _______________________________________________ Python-Dev mailing list [email protected] https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com