On Wed, 15 Jun 2016 at 12:12 Koos Zevenhoven <k7ho...@gmail.com> 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.
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