Proposal to remove Python 2 support

[Pedro Alves]

On 9/15/20 9:46 PM, Tom Tromey wrote:
> Hi.  Python 2 officially reached its sunset date this year:
> 
>     https://www.python.org/doc/sunset-python-2/
> 
> I think gdb should follow suit starting in gdb 11 -- that is, my
> proposal is to keep Python 2 support for the upcoming gdb 10 release,
> but remove said support from git master.
> 
> In the short term this would amount to some relatively minor code
> cleanups.
> 
> In the longer term, my preferred approach to handling inferior control
> from Python is to base it on async/await, which IIUC is only available
> in Python 3.  So, this would be an enabling step.

Dropping Python 2 support is going to be an issue for us, given we will
still have a couple years more of DTS releases for RHEL 7, which is
Python 2.7 based.

If possible, we would prefer if Python 2 support was kept around a
while longer.

Thanks,
Pedro Alves