[REQ] Remove support for unsupported Python versions

[rafmagns-skepa-dreag]

Request

This is unrelated to any issues I've encountered.

As Python 2.7 hit EOL last week, are there plans to remove support for Python 2.7 (as well as any lingering support for Python 3.x < 3.5) since it is no longer maintained?

Handy chart of which Python versions are being supported

It would help clean up a bit of the code and remove six as a dependency.

Unrelated question - is there a style guide for the Python templates?

Ideal Solution

Support for Python < 3.5 is dropped (at least for the main Python generator) by updating the Python templates. I'm happy to help with this.

[spacether]

I am open to keeping or removing older python versions.
It is unclear to me what % of our users are using older or unsupported versions of python.
Remove python2 versions could be great because it would let us switch to bytes as the bytes type as python3 has it built in out of the box.

Core Team:
@wing328 (2015/07)
@jimschubert (2016/05)
@cbornet (2016/05)
@ackintosh (2018/02)
@jmini (2018/04)
@etherealjoy (2019/06)

Do we have any records of this?
Do the companies/projects using openapi generator tell us which generator they are using and what version of the language they are using?
Can our users comment in this thread on what version of Python they use?

[spacether]

It doesn't look like we have a specific python style guide that we use.
For reference we run flake8 as part of our test suite in py27 and python3:
https://github.com/OpenAPITools/openapi-generator/blob/master/samples/client/petstore/python/test_python2.sh#L26

[wing328]

Do we have any records of this?

Nope generally we don't but as you probably aware there's a PR to add support for Python 2.6.

Do the companies/projects using openapi generator tell us which generator they are using and what version of the language they are using?

We've not received any private feedback from companies to support a particular EOL programming language (e.g. PHP 4.x)

It doesn't look like we have a specific python style guide that we use.

https://github.com/OpenAPITools/openapi-generator/blob/master/CONTRIBUTING.md#style-guide

We can make an announcement to set a particular date/version to remove Python 2.x support from all Python client/server generators and see if there's any objection from the community.

To me, 2019 June/July (6 months from now) is a reasonable time to make the breaking changes and users can alays use old stable releases if they need Python 2.x support.

[bukowa]

Any updates?

[spacether]

Python-experimental has been updated to support python >= 3.5 only in #7061
to allow type hinting in generated code
python 2.x libraries and six were removed from python-experimental

[johnthagen]

I just wanted to comment that having type hints in the generated Python code would be a huge productivity boost.

[spacether]

This was resolved by #8042 for the python generator.