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venv/lib/python3.12/site-packages/pip/_internal/models/scheme.py

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+"""
+For types associated with installation schemes.
+
+For a general overview of available schemes and their context, see
+https://docs.python.org/3/install/index.html#alternate-installation.
+"""
+
+from dataclasses import dataclass
+
+SCHEME_KEYS = ["platlib", "purelib", "headers", "scripts", "data"]
+
+
+@dataclass(frozen=True)
+class Scheme:
+    """A Scheme holds paths which are used as the base directories for
+    artifacts associated with a Python package.
+    """
+
+    __slots__ = SCHEME_KEYS
+
+    platlib: str
+    purelib: str
+    headers: str
+    scripts: str
+    data: str