Upgrade dunamai to Python 3.6

[wwuck]

Python 3.5 is end-of-life, and upgrading to 3.6 will allow dunamai to drop the dependency on setuptools.

Is there any need to keep 3.5 compatibility?

I will submit a PR for updating to 3.6 and removing setuptools.

[mtkennerly]

For now, I would prefer to maintain Python 3.5 compatibility. I do understand that it's officially end of life, but there will still be groups using it because of inertia. I'd like to maintain the compatibility until there's a true need to drop it (e.g., if it were a prerequisite for supporting a newer Python version).

[wwuck]

No worries. I guess I’ll live with the setuptools dependency for now.

[mtkennerly]

Actually, #29 just got rid of the dependency in a different way, although there's still a minor issue with it that needs to be investigated before I can make a new release with it.

[wwuck]

Ahhh I see. I didn’t think to check older package versions for 3.5 compatibility.

[wwuck]

Just a quick note that the latest versions of pytest and mypy only support py36+. flake8 v4 released this week has also dropped support for python < 3.6.

I ran a quick query on the pypi public dataset https://packaging.python.org/guides/analyzing-pypi-package-downloads/ for dunamai showing downloads over the last 3 months, keeping in mind that the data is not 100% accurate as stated on that packaging webpage.

#standardSQL
SELECT
  REGEXP_EXTRACT(details.python, r"[0-9]+\.[0-9]+") AS python_version,
  COUNT(*) AS num_downloads,
FROM `bigquery-public-data.pypi.file_downloads`
WHERE
  file.project = 'dunamai'
  -- Only query the last 3 months of history
  AND DATE(timestamp)
    BETWEEN DATE_TRUNC(DATE_SUB(CURRENT_DATE(), INTERVAL 3 MONTH), MONTH)
    AND CURRENT_DATE()
GROUP BY `python_version`
ORDER BY `num_downloads` DESC

[
  {
    "python_version": "3.7",
    "num_downloads": "160579"
  },
  {
    "python_version": "3.8",
    "num_downloads": "105883"
  },
  {
    "python_version": null,
    "num_downloads": "49834"
  },
  {
    "python_version": "3.9",
    "num_downloads": "30326"
  },
  {
    "python_version": "3.6",
    "num_downloads": "4329"
  },
  {
    "python_version": "3.10",
    "num_downloads": "1099"
  },
  {
    "python_version": "3.5",
    "num_downloads": "214"
  },
  {
    "python_version": "2.7",
    "num_downloads": "4"
  }
]

and also for the last 30 days

#standardSQL
SELECT
  REGEXP_EXTRACT(details.python, r"[0-9]+\.[0-9]+") AS python_version,
  COUNT(*) AS num_downloads,
FROM `bigquery-public-data.pypi.file_downloads`
WHERE
  file.project = 'dunamai'
  -- Only query the last 3 months of history
  AND DATE(timestamp)
    BETWEEN DATE_SUB(CURRENT_DATE(), INTERVAL 30 DAY)
    AND CURRENT_DATE()
GROUP BY `python_version`
ORDER BY `num_downloads` DESC

[
  {
    "python_version": "3.7",
    "num_downloads": "37582"
  },
  {
    "python_version": "3.8",
    "num_downloads": "33851"
  },
  {
    "python_version": null,
    "num_downloads": "16848"
  },
  {
    "python_version": "3.9",
    "num_downloads": "10832"
  },
  {
    "python_version": "3.10",
    "num_downloads": "1081"
  },
  {
    "python_version": "3.6",
    "num_downloads": "1063"
  },
  {
    "python_version": "3.5",
    "num_downloads": "101"
  }
]

I'm not surprised to see the py36 usage declining too as it will reach EOL in December 2021. It would appear that dunamai is still used on py35, even if only a very small amount.