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annotate bin/activate_this.py @ 0:9e54283cc701 draft

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"planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
author guerler
date Mon, 27 Jul 2020 03:47:31 -0400
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1 # -*- coding: utf-8 -*-
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2 """Activate virtualenv for current interpreter:
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4 Use exec(open(this_file).read(), {'__file__': this_file}).
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6 This can be used when you must use an existing Python interpreter, not the virtualenv bin/python.
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7 """
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8 import os
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9 import site
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10 import sys
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12 try:
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13 abs_file = os.path.abspath(__file__)
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14 except NameError:
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15 raise AssertionError("You must use exec(open(this_file).read(), {'__file__': this_file}))")
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17 bin_dir = os.path.dirname(abs_file)
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18 base = bin_dir[: -len("bin") - 1] # strip away the bin part from the __file__, plus the path separator
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20 # prepend bin to PATH (this file is inside the bin directory)
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21 os.environ["PATH"] = os.pathsep.join([bin_dir] + os.environ.get("PATH", "").split(os.pathsep))
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22 os.environ["VIRTUAL_ENV"] = base # virtual env is right above bin directory
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24 # add the virtual environments libraries to the host python import mechanism
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25 prev_length = len(sys.path)
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26 for lib in "../lib/python3.8/site-packages".split(os.pathsep):
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27 path = os.path.realpath(os.path.join(bin_dir, lib))
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28 site.addsitedir(path.decode("utf-8") if "" else path)
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29 sys.path[:] = sys.path[prev_length:] + sys.path[0:prev_length]
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31 sys.real_prefix = sys.prefix
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32 sys.prefix = base