PEP 570 (Positional-only Argument Syntax) tracker

[srittau]

This issue is supposed to track when we can start to use Python's standard positional-only argument syntax (PEP 570) in typeshed. Support is needed in released versions of:

• mypy (supported when running under Python 3.8+)
• pytype
• pyright
• pyre
• PyCharm

[sproshev]

Supported in PyCharm more than a year https://youtrack.jetbrains.com/issue/PY-35512

[layday]

This appears to be supported in Pyright at least since 1.1.0 released in November 2019.

[srittau]

@pradeep90 Are PEP 570-style positional arguments (i.e. def foo(arg, /): ...) supported in pyre?

[pradeep90]

@srittau Yes, they're supported in Pyre.

[AlexWaygood]

@rchen152, does google/pytype@3e228a0 mean that pytype now supports PEP 570? :)

[hauntsaninja]

I believe PEP 570 requires 3.8 for mypy / ast, not 3.7

[srittau]

I believe PEP 570 requires 3.8 for mypy / ast, not 3.7

Fixed (without testing).

[rchen152]

@AlexWaygood Yes, it's supported now!

[AlexWaygood]

@AlexWaygood Yes, it's supported now!

Awesome!

[srittau]

PEP 570 is supported now and we have started to use it in typeshed. See #11237 for tracking the switch.