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from pip._vendor.packaging.version import parse as parse_version

from pip._internal.utils.models import KeyBasedCompareMixin
from pip._internal.utils.typing import MYPY_CHECK_RUNNING

if MYPY_CHECK_RUNNING:
    from pip._vendor.packaging.version import _BaseVersion
    from pip._internal.models.link import Link

class InstallationCandidate(KeyBasedCompareMixin):
    """Represents a potential "candidate" for installation.
    """

__slots__ = ["name", "version", "link"]

def __init__(self, name, version, link):
        # type: (str, str, Link) -> None
        self.name = name
        self.version = parse_version(version)  # type: _BaseVersion
        self.link = link

super(InstallationCandidate, self).__init__(
            key=(self.name, self.version, self.link),
            defining_class=InstallationCandidate
        )

def __repr__(self):
        # type: () -> str
        return "<InstallationCandidate({!r}, {!r}, {!r})>".format(
            self.name, self.version, self.link,
        )

def __str__(self):
        # type: () -> str
        return '{!r} candidate (version {} at {})'.format(
            self.name, self.version, self.link,
        )

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