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venv/lib/python3.9/site-packages/pip/_internal/models/candidate.py

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+from dataclasses import dataclass
+
+from pip._vendor.packaging.version import Version
+from pip._vendor.packaging.version import parse as parse_version
+
+from pip._internal.models.link import Link
+
+
+@dataclass(frozen=True)
+class InstallationCandidate:
+    """Represents a potential "candidate" for installation."""
+
+    __slots__ = ["name", "version", "link"]
+
+    name: str
+    version: Version
+    link: Link
+
+    def __init__(self, name: str, version: str, link: Link) -> None:
+        object.__setattr__(self, "name", name)
+        object.__setattr__(self, "version", parse_version(version))
+        object.__setattr__(self, "link", link)
+
+    def __str__(self) -> str:
+        return f"{self.name!r} candidate (version {self.version} at {self.link})"