Backward compatibility with python 2.7

[ryanbagwell]

I recently had the need to switch from django-storages to django-s3-storage because of matthewwithanm/django-imagekit#391. This adds a bit of backwards compatibility with python 2.7.

Note - I just found the commit from 2019 that dropped support for Django < 2.2, which also dropped support for Python 2.7. Please consider this PR anyway as the changes are relatively minor.

[etianen]

From the Django docs: The last version to support Python 2.7 is Django 1.11 LTS.

And Django 1.11 LTS has been out support for a while now. So AFAIK there's no supported version of Django that supports Python 2.7, which is itself unsupported from the core CPython team.

I see that your changes are relatively minor, but I'm afraid I don't really want to introduce any complexity to support software that's otherwise unsupported. At this point, using Python 2.7 and Django 1.11 is going to cause a whole lot of security problems and runtime issues. I realize that there can be some pragmatic reasons for using Python 2.7, and I certainly feel your pain!

I'd suggest maintaining your own fork of this project if you need Python 2.7 support. It's not a huge burden at this point, as the codebase is pretty stable.

[ryanbagwell]

@etianen understood. No worries. Thanks