Support for Python 2.7

[andy-maier]

• istr version: 1.0.1
• Python version: 2.7
• Operating System: any

Description

Despite the fact that Python 2.7 wil be declared end of life in 1/2020, there are numerous projects out there that still support it. If any of those wants to start using istr, the main inhibitor will be that istr does not support 2.7. My own Python projects are all of that category :-)

I think what it takes to add Python 2.7 support is:

• using six.text_type instead of str (or because nothing else would be used of six, a simple type definition that mimics that).
• replacing str.casefold() with str.tolower()

[s0undt3ch]

I'm really not against dropping support down to 2.7.
I guess, as long as we made it clear that the behavior is not the same, ie, .casefold() is not the same as .lower(). As you suggesting we implement tolower() and have it do all the work .casefold() does in Py3?