File Content: discover.py from __future__ import absolute_import, unicode_literals from abc import ABCMeta, abstractmethod from six import add_metaclass @add_metaclass(ABCMeta) class Discover(object): """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 # noinspection PyUnusedLocal def __init__(self, options): """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 Submit