[Python-Dev] file system path protocol PEP (original) (raw)

Sven R. Kunze srkunze at mail.de
Sat May 14 05:36:08 EDT 2016

On 13.05.2016 18:43, Chris Angelico wrote:

https://docs.python.org/3/c-api/unicode.html#c.PyUnicodeCheck

https://docs.python.org/3/c-api/unicode.html#c.PyUnicodeCheckExact

Thanks for pointing me at this. I searched via github and found usages only: https://github.com/python/cpython/search?utf8=%E2%9C%93&q=PyUnicode_Check

"Check" accepts subclasses; "CheckExact" doesn't (it's like "type(x) is str"). The question is, which one SHOULD be being done? What should this do:

class TmpPath(str): def fspath(self): return "/tmp/"+self x = TmpPath("foo/bar") open(x, "w") Does that respect fspath, or respect the fact that it's a string?

Fine example. Thinking naively, I would say, when somebody made an effort to write fspath, it should be respected. Maybe, that's just me.

Not sure if that can be a source of errors, when somebody adds str as baseclass later because the team needs str functionality. At least I would expect fspath to still work .

Best, Sven

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