[PATCH 6 of 7] py3: use try/except to check for basestring

[Yuya Nishihara]

On Mon, 7 Nov 2016 00:15:21 +0530, Pulkit Goyal wrote:
> This https://www.mercurial-scm.org/pipermail/mercurial-devel/2016-October/089099.html
> is a better version of what I want to do, since this didn't went
> through I will be using this.

I'm okay with that pycompat.basestring stuff, but I'm pretty sure most of
our basestring uses are moot since we avoid using unicodes except for very
specific string manipulations.

> >> @@ -520,7 +520,12 @@
> >>          result = self.config(section, name, untrusted=untrusted)
> >>          if result is None:
> >>              result = default or []
> >> -        if isinstance(result, basestring):
> >> +        checkunicode = False
> >> +        try:
> >> +            checkunicode = isinstance(result, basestring)
> >> +        except NameError:
> >> +            checkunicode = isinstance(result, str)
> >> +        if checkunicode:
> >>              result = _configlist(result.lstrip(' ,\n'))

And with this change, ui.configlist() would look as if it supports unicodes,
which seems confusing.