- The feature must be documented in both the API and narrative

documentation.

- The feature must work fully on the following CPython versions: 2.7,

3.5, 3.6, 3.7 and 3.8 on both UNIX and Windows.

- The feature must work fully on the following CPython versions:

3.6, 3.7, 3.8 and 3.9 on both UNIX and Windows.

- The feature must not add unnecessary dependencies (where

"unnecessary" is of course subjective, but new dependencies should

We support:

- `Python 3.5`_

- `Python 3.6`_

- `Python 3.7`_

- `Python 3.8`_

- `Python 3.9`_

.. _Python 3.5:https://docs.python.org/3.5/

.. _Python 3.6:https://docs.python.org/3.6/

.. _Python 3.7:https://docs.python.org/3.7/

.. _Python 3.8:https://docs.python.org/3.8/

.. _Python 3.9:https://docs.python.org/3.9/

Supported versions can be found in our ``noxfile.py`` `config`_.

.. _config:https://github.com/googleapis/python-api-core/blob/master/noxfile.py

Python 2.7 support is deprecated. All code changes should maintain Python 2.7 compatibility until January 1, 2020.

We also explicitly decided to support Python 3 beginning with version

3.5. Reasons for this include:

3.6. Reasons for this include:

- Encouraging use of newest versions of Python 3

- Taking the lead of `prominent`_ open-source `projects`_

"git": {

"name": ".",

"remote": "https://github.com/googleapis/python-api-core.git",

"sha": "7a38243c351b228d103eee81fc5ae521ad1c930e"

"sha": "4e12b76573e2a1726b0a59a5accc99532e010732"

}

},

{

"git": {

"name": "synthtool",

"remote": "https://github.com/googleapis/synthtool.git",

"sha": "aa255b15d52b6d8950cca48cfdf58f7d27a60c8a"

"sha": "b670a77a454f415d247907908e8ee7943e06d718"

}

}

],