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From: Devin Jeanpierre <jeanpierreda@gmail.com>
Date: Mon, 15 Dec 2014 00:38:18 -0800
Subject: Re: Portable code: __import__ demands different string types between 2 and 3
To: Ben Finney <ben+python@benfinney.id.au>
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On Sun, Dec 14, 2014 at 11:29 PM, Ben Finney <ben+python@benfinney.id.au> wrote:
> I'm slowly learning about making Python code that will run under both
> Python 2 (version 2.6 or above) and Python 3 (version 3.2 or above).
>
> This entails, I believe, the admonition to ensure text literals are
> Unicode by default::
>
>     from __future__ import unicode_literals

Ordinarily, for 2.x/3.3+ code I would suggest not doing this --
instead, b'...' for bytes, u'...' for unicode, and '...' for native
"string" type (bytes on 2.x, unicode on 3.x). This is the main benefit
of the u'...' syntax addition.

For 3.2, you'll have to do b'...' for bytes, '...' for unicode, and
str('...') for platform-specific strings (bytes on 2.x, unicode on
3.x).  It is in good taste to make an alias of str so it's less
confusing, e.g. native_str = str.

So for example, it's __import__(str("foo")), and getattr(foo, str("bar"), baz).

-- Devin