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47 lines
1.2 KiB
Python
47 lines
1.2 KiB
Python
4 years ago
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from __future__ import absolute_import, unicode_literals
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from abc import ABCMeta, abstractmethod
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from six import add_metaclass
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@add_metaclass(ABCMeta)
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class Discover(object):
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"""Discover and provide the requested Python interpreter"""
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@classmethod
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def add_parser_arguments(cls, parser):
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"""Add CLI arguments for this discovery mechanisms.
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:param parser: the CLI parser
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"""
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raise NotImplementedError
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# noinspection PyUnusedLocal
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def __init__(self, options):
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"""Create a new discovery mechanism.
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:param options: the parsed options as defined within :meth:`add_parser_arguments`
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"""
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self._has_run = False
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self._interpreter = None
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@abstractmethod
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def run(self):
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"""Discovers an interpreter.
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:return: the interpreter ready to use for virtual environment creation
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"""
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raise NotImplementedError
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@property
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def interpreter(self):
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"""
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:return: the interpreter as returned by :meth:`run`, cached
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"""
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if self._has_run is False:
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self._interpreter = self.run()
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self._has_run = True
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return self._interpreter
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