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annotate env/lib/python3.9/site-packages/virtualenv/discovery/discover.py @ 0:4f3585e2f14b draft default tip

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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author shellac
date Mon, 22 Mar 2021 18:12:50 +0000
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1 from __future__ import absolute_import, unicode_literals
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2
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3 from abc import ABCMeta, abstractmethod
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4
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5 from six import add_metaclass
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6
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7
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8 @add_metaclass(ABCMeta)
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9 class Discover(object):
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10 """Discover and provide the requested Python interpreter"""
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11
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12 @classmethod
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13 def add_parser_arguments(cls, parser):
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14 """Add CLI arguments for this discovery mechanisms.
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15
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16 :param parser: the CLI parser
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17 """
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18 raise NotImplementedError
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19
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20 # noinspection PyUnusedLocal
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21 def __init__(self, options):
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22 """Create a new discovery mechanism.
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23
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24 :param options: the parsed options as defined within :meth:`add_parser_arguments`
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25 """
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26 self._has_run = False
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27 self._interpreter = None
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28 self._env = options.env
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29
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30 @abstractmethod
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31 def run(self):
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32 """Discovers an interpreter.
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33
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34
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35 :return: the interpreter ready to use for virtual environment creation
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36 """
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37 raise NotImplementedError
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38
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39 @property
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40 def interpreter(self):
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41 """
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42 :return: the interpreter as returned by :meth:`run`, cached
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43 """
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44 if self._has_run is False:
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45 self._interpreter = self.run()
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46 self._has_run = True
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47 return self._interpreter