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Editing: discover.py

from __future__ import annotations

from abc import ABC, abstractmethod

class Discover(ABC):
    """Discover and provide the requested Python interpreter."""

@classmethod
    def add_parser_arguments(cls, parser):
        """
        Add CLI arguments for this discovery mechanisms.

:param parser: the CLI parser
        """
        raise NotImplementedError

def __init__(self, options) -> None:
        """
        Create a new discovery mechanism.

:param options: the parsed options as defined within :meth:`add_parser_arguments`
        """
        self._has_run = False
        self._interpreter = None
        self._env = options.env

@abstractmethod
    def run(self):
        """
        Discovers an interpreter.

:return: the interpreter ready to use for virtual environment creation
        """
        raise NotImplementedError

@property
    def interpreter(self):
        """:return: 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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