Drop support for EOL Python versions <3.6

[g-k]

Kinda blocked on html5lib switching to Python 3, but this would:

• let us drop the dependency on six (pending html5lib doing the same)
• add Python 3 type annotations (outside comments)
• use other Python 3 features
• reduce compat and testing burden

TODO:

• check Python 2/2.7 usage stats https://pypistats.org/packages/bleach
• see if major library consumers in the ecosystem would be impacted

Given that CPython 2.7 support is ending I think it's safe to drop Python 2 support with the next major release.

[jvanasco]

What about announcing that 4.0 will drop Python2 support, so people can pin dependencies for auto upgrades now?

[g-k]

Absolutely, do you have any suggestions on where to announce that?

…

On Mon, Jun 8, 2020 at 12:07 PM Jonathan Vanasco ***@***.***> wrote: What about announcing that 4.0 will drop Python2 support, so people can pin dependencies for auto upgrades now? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#520 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AABXKLMXZHLCKZ5S66E6UZ3RVUEETANCNFSM4LGOFUAA> .

[g-k]

We should also drop support for unsupported python 3 versions too currently everything <3.6 https://en.wikipedia.org/wiki/History_of_Python#Version_3