How to use the poetry.semver.Version.parse function in poetry

def test_intersect():
    v = Version.parse("1.2.3")

    assert v.intersect(v) == v
    assert v.intersect(Version.parse("1.1.4")).is_empty()
    assert (
        v.intersect(VersionRange(Version.parse("1.1.4"), Version.parse("1.2.4"))) == v
    )
    assert (
        Version.parse("1.1.4")
        .intersect(VersionRange(v, Version.parse("1.2.4")))
        .is_empty()

def test_deactivate_activated(tmp_dir, manager, poetry, config, mocker):
    if "VIRTUAL_ENV" in os.environ:
        del os.environ["VIRTUAL_ENV"]

    venv_name = manager.generate_env_name("simple-project", str(poetry.file.parent))
    version = Version.parse(".".join(str(c) for c in sys.version_info[:3]))
    other_version = Version.parse("3.4") if version.major == 2 else version.next_minor
    (
        Path(tmp_dir) / "{}-py{}.{}".format(venv_name, version.major, version.minor)
    ).mkdir()
    (
        Path(tmp_dir)
        / "{}-py{}.{}".format(venv_name, other_version.major, other_version.minor)
    ).mkdir()

    envs_file = TomlFile(Path(tmp_dir) / "envs.toml")
    doc = tomlkit.document()
    doc[venv_name] = {
        "minor": "{}.{}".format(other_version.major, other_version.minor),
        "patch": other_version.text,
    }
    envs_file.write(doc)

def check_output_wrapper(version=Version.parse("3.7.1")):
    def check_output(cmd, *args, **kwargs):
        if "sys.version_info[:3]" in cmd:
            return version.text
        elif "sys.version_info[:2]" in cmd:
            return "{}.{}".format(version.major, version.minor)
        else:
            return str(Path("/prefix"))

    return check_output

def v200():
    return Version.parse("2.0.0")

def test_equality():
    assert Version.parse("1.2.3") == Version.parse("01.2.3")
    assert Version.parse("1.2.3") == Version.parse("1.02.3")
    assert Version.parse("1.2.3") == Version.parse("1.2.03")
    assert Version.parse("1.2.3-1") == Version.parse("1.2.3-01")
    assert Version.parse("1.2.3+1") == Version.parse("1.2.3+01")

def test_allows():
    v = Version.parse("1.2.3")
    assert v.allows(v)
    assert not v.allows(Version.parse("2.2.3"))
    assert not v.allows(Version.parse("1.3.3"))
    assert not v.allows(Version.parse("1.2.4"))
    assert not v.allows(Version.parse("1.2.3-dev"))
    assert not v.allows(Version.parse("1.2.3+build"))

def test_difference():
    v = Version.parse("1.2.3")

    assert v.difference(v).is_empty()
    assert v.difference(Version.parse("0.8.0")) == v
    assert v.difference(
        VersionRange(Version.parse("1.1.4"), Version.parse("1.2.4"))
    ).is_empty()
    assert (
        v.difference(VersionRange(Version.parse("1.4.0"), Version.parse("3.0.0"))) == v
    )

def test_remove_also_deactivates(tmp_dir, manager, poetry, config, mocker):
    config.merge({"virtualenvs": {"path": str(tmp_dir)}})

    venv_name = manager.generate_env_name("simple-project", str(poetry.file.parent))
    (Path(tmp_dir) / "{}-py3.7".format(venv_name)).mkdir()
    (Path(tmp_dir) / "{}-py3.6".format(venv_name)).mkdir()

    mocker.patch(
        "poetry.utils._compat.subprocess.check_output",
        side_effect=check_output_wrapper(Version.parse("3.6.6")),
    )

    envs_file = TomlFile(Path(tmp_dir) / "envs.toml")
    doc = tomlkit.document()
    doc[venv_name] = {"minor": "3.6", "patch": "3.6.6"}
    envs_file.write(doc)

    venv = manager.remove("python3.6")

    assert (Path(tmp_dir) / "{}-py3.6".format(venv_name)) == venv.path
    assert not (Path(tmp_dir) / "{}-py3.6".format(venv_name)).exists()

    envs = envs_file.read()
    assert venv_name not in envs

def _get_release_info(self, name, version):  # type: (str, str) -> dict
        page = self._get("/{}/".format(canonicalize_name(name).replace(".", "-")))
        if page is None:
            raise PackageNotFound('No package named "{}"'.format(name))

        data = {
            "name": name,
            "version": version,
            "summary": "",
            "requires_dist": [],
            "requires_python": None,
            "files": [],
            "_cache_version": str(self.CACHE_VERSION),
        }

        links = list(page.links_for_version(Version.parse(version)))
        if not links:
            raise PackageNotFound(
                'No valid distribution links found for package: "{}" version: "{}"'.format(
                    name, version
                )
            )
        urls = defaultdict(list)
        files = []
        for link in links:
            if link.is_wheel:
                urls["bdist_wheel"].append(link.url)
            elif link.filename.endswith(
                (".tar.gz", ".zip", ".bz2", ".xz", ".Z", ".tar")
            ):
                urls["sdist"].append(link.url)

def __init__(self, name, version, pretty_version=None):
        """
        Creates a new in memory package.
        """
        self._pretty_name = name
        self._name = canonicalize_name(name)

        if not isinstance(version, Version):
            self._version = Version.parse(version)
            self._pretty_version = pretty_version or version
        else:
            self._version = version
            self._pretty_version = pretty_version or self._version.text

        self.description = ""

        self._authors = []
        self._maintainers = []

        self.homepage = None
        self.repository_url = None
        self.documentation_url = None
        self.keywords = []
        self._license = None
        self.readme = None