[Python-Dev] Formatting of positional-only parameters in signatures (original) (raw)

Yury Selivanov yselivanov.ml at gmail.com
Tue Jan 21 18:51:34 CET 2014

Terry,

On January 21, 2014 at 12:23:31 PM, Terry Reedy (tjreedy at udel.edu) wrote:

> On 1/21/2014 10:59 AM, Yury Selivanov wrote: > There is one more, hopefully last, open urgent question with the signature > object. At the time we were working on the PEP 362, PEP 457 didn’t > exist. Nor did we have any function with real positonal-only parameters, > since there was no Argument Clinic yet. However, I implemented > rudimentary support for them: > > “Parameter.POSITIONALONLY” constant; > > “Signature.bind” and “Signature.bindpartial” fully support functions > with positional-only parameters; > _> “Signature.str_” renders them distinctively from other kinds. > _> The last point is the troublesome now. "Signature.str_” renders > positional-only parameters in ‘<>’ brackets, so in: > > foo(, , baz)

This amounts to a hidden new API.

Yes, and no. This wasn’t documented and until 3.4 we had no real-world positonal-only parameters. So I think it’s OK to fix this now.

Yury

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