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"""Virtualenv-specific Discover base class for plugin-based Python discovery.""" from __future__ import annotations import os from abc import ABC, abstractmethod from typing import TYPE_CHECKING if TYPE_CHECKING: from argparse import ArgumentParser from collections.abc import Mapping from python_discovery import PythonInfo from virtualenv.config.cli.parser import VirtualEnvOptions class Discover(ABC): @classmethod def add_parser_arguments(cls, parser: ArgumentParser) -> None: raise NotImplementedError def __init__(self, options: VirtualEnvOptions) -> None: self._has_run = False self._interpreter: PythonInfo | None = None self._env: Mapping[str, str] = options.env if options.env is not None else os.environ @abstractmethod def run(self) -> PythonInfo | None: raise NotImplementedError @property def interpreter(self) -> PythonInfo | None: """:returns: the interpreter as returned by :meth:`run`, cached""" if self._has_run is False: self._interpreter = self.run() self._has_run = True return self._interpreter __all__ = [ "Discover", ]
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