On Sat, Feb 11, 2017 at 6:22 AM, boB Stepp <robertvst...@gmail.com> wrote: > On Fri, Feb 10, 2017 at 11:49 PM, eryk sun <eryk...@gmail.com> wrote: > >> It's from the function's __text_signature__. >> >> >>> repr.__text_signature__ >> '($module, obj, /)' >> >> It means "obj" is a positional-only argument that cannot be passed as a >> keyword. > > [snip] > >> Look at open() for comparison. >> >> >>> open.__text_signature__ >> "($module, /, file, mode='r', buffering=-1, encoding=None,\n >> errors=None, newline=None, closefd=True, opener=None)" > > In your comparison example, a forward slash appears again, but this > time after "$module" in the location where "obj" previously appeared > in the repr example. Is it indicating a similar use here?
All parameters listed before the slash are position-only. Everything after the slash can be passed as a keyword argument. > Can you provide a link to "__text_signature__" in the docs? I tried > searching for it, but came up empty. No, I can't. It was added in issue 19674. http://bugs.python.org/issue19674 The '/' syntax for positional-only arguments is documented in PEP 457. https://www.python.org/dev/peps/pep-0457 Also see the how-to for CPython's "Argument Clinic" preprocessor, since (for now) positional-only arguments are only a concern for built-in functions. https://docs.python.org/3/howto/clinic.html _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
