fix: take virtualenvs.prefer-active-python into account on EnvManager.get()

[finswimmer]

Until now virtualenvs.prefer-active-python wasn't respected by the EnvManager when it tries to get the venv. This is fixed by the PR.

I took the chance to refactor EnvManager in that way, that IO is now set during initializing a new object. Thus it is not necessary to pass it in into the several methods.

Pull Request Check List

Resolves: #6893
Resolves: #5947

• Added tests for changed code.
• Updated documentation for changed code.

[mkniewallner]

Suggested change

	def _get_python_version(self) -> list[int]:
	version_info = list(sys.version_info[:3])
	if self._poetry.config.get("virtualenvs.prefer-active-python"):
	executable = self._detect_active_python()
	if executable:
	python_patch = decode(
	subprocess.check_output(
	list_to_shell_command(
	[executable, "-c", GET_PYTHON_VERSION_ONELINER]
	),
	shell=True,
	).strip()
	)
	version_info = [int(v) for v in python_patch.split(".")[:3]]
	return version_info
	def _get_python_version(self) -> tuple[int, int, int]:
	if self._poetry.config.get("virtualenvs.prefer-active-python"):
	executable = self._detect_active_python()
	if executable:
	python_patch = decode(
	subprocess.check_output(
	list_to_shell_command(
	[executable, "-c", GET_PYTHON_VERSION_ONELINER]
	),
	shell=True,
	).strip()
	)
	return tuple(int(v) for v in python_patch.split(".")[:3])
	return sys.version_info[:3]

Using a tuple would more clearly indicate that we expect 3 items.

[finswimmer]

I implemented a version that returns a tuple. mypy was a little bit in the way here ...

[neersighted]

I'd rather we had one source of truth for this/it feels like the abstraction is leaking even more, but this is a fix for a real issue and it doesn't make the amount of work needed to refactor this file greater.

[github-actions]

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