Re: [Qemu-devel] [PATCH v3 6/8] iotests: Test driver whitelisting in 093

[John Snow <jsnow@redhat.com>]

On 9/17/19 7:22 AM, Kevin Wolf wrote:
> Am 17.09.2019 um 13:07 hat Max Reitz geschrieben:
>> On 17.09.19 10:40, Kevin Wolf wrote:
>>> Am 17.09.2019 um 10:18 hat Max Reitz geschrieben:
>>>> On 13.09.19 20:30, John Snow wrote:
>>>>> I'd still like to define func_wrapper with a nod to the type constraint
>>>>> it has:
>>>>>
>>>>> def func_wrapper(instance: iotests.QMPTestCase, *args, **kwargs):
>>>>>     [...]
>>>>>
>>>>>
>>>>> Then, you'd write:
>>>>>
>>>>> if callable(required_formats):
>>>>>     fmts = required_formats(instance)
>>>>> else:
>>>>>     fmts = required_formats
>>>>
>>>> Yep, that anyway.  (Although I didn’t know about the “param: type”
>>>> syntax and put that constraint in a comment instead.  Thanks again :-))
>>>
>>> Note that function annotations are Python 3 only, so we can't use that
>>> syntax yet anyway. If you want to use type hints that are understood by
>>> tools (like mypy) and compatible with Python 2, you have to use
>>> something like this (feel free to be more specific than Any):
>>
>> Do we really feel like staying compatible with Python 2, though?
> 
> Feel like it? No.
> 
> It's more that we are compelled to do so because we only deprecated it
> in 4.1.
> 
> Kevin
> 

Sorry for the impromptu lesson on type hints in 3.5! I added that in to
my suggestion as a demonstrative example and didn't mean for you to use
it as-is, sorry for not making that clear.

I'm confused about the Python3 deprecation timeline. Normally we'd
follow our standard approach, but it does hit EOL at the end of this
year, so do we drop support then, too? I have the memory of a goldfish I
suppose, and can't quite remember our conclusions, if any, of previous
discussions on this subject.

If we do drop python2 though, the new minimum version appears to be 3.5
because that's what ships in EPEL. That'd give us standardized type
hints that we can use for static analysis tools.