Packaging 21.0

[frenzymadness]

According to my testing in Fedora with more than 180 RPM packages, poetry and poetry-core packages are compatible with the latest packaging version 21.0. The main reason for the major release is that packaging 21 no longer supports Python < 3.6.

So I think that you can update it.

• I have searched the issues of this repo and believe that this is not a duplicate.
• I have searched the documentation and believe that my question is not covered.

[hroncok]

According to my testing in Fedora with more than 180 RPM packages, poetry and poetry-core packages are compatible with the latest packaging version 21.0.

I am afraid there is a problem: https://src.fedoraproject.org/rpms/poetry/pull-request/17#comment-83627

[hroncok]

Packaging 21.0 also drops support for Python 2.7 and Poetry executes a file from it with the venv's Python interpreter:

poetry/poetry/utils/env.py

Lines 1491 to 1519 in cd51129

	def get_supported_tags(self) -> List[Tag]:
	file_path = Path(packaging.tags.__file__)
	if file_path.suffix == ".pyc":
	# Python 2
	file_path = file_path.with_suffix(".py")
	with file_path.open(encoding="utf-8") as f:
	script = decode(f.read())
	script = script.replace(
	"from ._typing import TYPE_CHECKING, cast",
	"TYPE_CHECKING = False\ncast = lambda type_, value: value",
	)
	script = script.replace(
	"from ._typing import MYPY_CHECK_RUNNING, cast",
	"MYPY_CHECK_RUNNING = False\ncast = lambda type_, value: value",
	)
	script += textwrap.dedent(
	"""
	import json
	print(json.dumps([(t.interpreter, t.abi, t.platform) for t in sys_tags()]))
	"""
	)
	output = self.run_python_script(script)
	return [Tag(*t) for t in json.loads(output)]

[sammko]

#5216 is a result of packaging 21. (Archlinux testing repo). Downstream https://bugs.archlinux.org/task/73867

[github-actions]

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