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[Python-ideas] tweaking the file system path protocol

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Accidentally sent the email before it was done. Additions / corrections below:On Fri, May 26, 2017 at 3:58 PM, Koos Zevenhoven <k7hoven at gmail.com> wrote:> On Wed, May 24, 2017 at 5:52 PM, Wolfgang Maier>>>> - makes the "path.__fspath__() if hasattr(path, "__fspath__") else path">> idiom consistent for subclasses of str and bytes that define __fspath__>>>> One can discuss whether this is the best idiom to use (I did not write> it, so maybe someone else has comments).>> Anyway, some may want to use>> path.__fspath__() if hasattr(path, "__fspath__") else str(path)>> and some may want>> path if isinstance(path, (str, bytes)) else path.__fspath__()>> Or others may not be after oneliners like this and instead include the> full implementation of fspath in their code—or even better, with some> modifications.>> Really, the best thing to use in pre-3.6 might be more like:>> def fspath(path):>     if isinstance(path, (str, bytes)):>         return path>     if hasattr(path, '__fspath__'):>         return path.__fspath__()>     if type(path).__name__ == 'DirEntry':>         return path.path>     if isinstance(path, pathlib.PurePath):>         return str(path)>     raise TypeError("Argument cannot be interpreted as a file system path: " + repr(path))>In the above, I have to check type(path).__name__, because DirEntrywas not exposed as os.DirEntry in 3.5 yet.For pre-3.4 Python and for older third-party libraries that do inheritfrom str/bytes, one could even use something like:def fspath(path):    if isinstance(path, (str, bytes)):        return path    if hasattr(type(path), '__fspath__'):        return type(path).__fspath__(path)    if type(path).__name__ == 'DirEntry':        return path.path    if "Path" in type(path).__name__: # add whatever known names forpath classes (what a hack!)        return str(path)    raise TypeError("Argument cannot be interpreted as a file systempath: " + repr(path))—Koos-- + Koos Zevenhoven +http://twitter.com/k7hoven +

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