Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/virtualenv/discovery/discover.py @ 0:26e78fe6e8c4 draft

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"planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
author shellac
date Sat, 02 May 2020 07:14:21 -0400
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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
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29 @abstractmethod
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30 def run(self):
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31 """Discovers an interpreter.
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32
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33
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34 :return: the interpreter ready to use for virtual environment creation
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35 """
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36 raise NotImplementedError
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37
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38 @property
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39 def interpreter(self):
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40 """
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41 :return: the interpreter as returned by :meth:`run`, cached
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42 """
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43 if self._has_run is False:
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44 self._interpreter = self.run()
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45 self._has_run = True
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46 return self._interpreter