[ase-users] ASE-3.13 release candidate

[Gaël Donval]

> We have standardized on "isinstance(..., basestring)" which is easy
> to 
> change to "isinstance(..., str)" once we drop support for legacy
> Python 
> (Python 2).
> 

May I shamelessly take advantage of this opportunity to ask how many of
you (ase users in general) still use ASE with Python 2? 

We may figure out that almost no one uses it anymore (I guess Anaconda
really helps there)! Having a Python 3 GUI was the only reason why I
kept the Python 2 version and I wouldn't be surprised many shared that
reason (thanks again for the great work!).

More realistically, many may still be stuck on the Python 2 version and
now seems to be a good time to say why.

Cheers,
Gaël
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