Using python3 keyword-only arguments or annotated arguments causes a ValueError from inspect

[KuangEleven]

Defining a task that uses the new Python3 keyword-only or annotation argument syntax and invoking causes a ValueError: Function has keyword-only arguments or annotations, use getfullargspec() API which can support them and halts.

Per the docstring for Python3 inspect, getfullargspec() could be used, but that function is itself deprecated in favor of inspect.signature() Unfortunately, neither of those functions exists in Python 2.6, so some level of cascading will be necessary.

For example, neither of these can be invoked:

from invoke import task

@task
def func(ctx, *args, keyonlyarg=42):
    print(keyonlyarg)

@task
def func2(ctx, x:int=3):
    print(x)

[FranklinChen]

Any word on this? I use Python 3 with mypy for types and just realized that I'm blocked on using invoke right now.

[bitprophet]

Thanks for the bump, I'll take a look at #373 soon which seems to be the main patch around this.

@FranklinChen If you can check out that PR's branch and confirm it works against latest master & solves your particular flavor of the issue, that'd be a big help!

[FranklinChen]

@bitprophet Yes, I am actually using the fork at #373 and it works for me.