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"""Activate virtualenv for current interpreter:Use exec(open(this_file).read(), {'__file__': this_file}).This can be used when you must use an existing Python interpreter, not the virtualenv bin/python."""import osimport siteimport systry:    abs_file = os.path.abspath(__file__)except NameError:    raise AssertionError("You must use exec(open(this_file).read(), {'__file__': this_file}))")bin_dir = os.path.dirname(abs_file)base = bin_dir[: -len("Scripts") - 1]  os.environ["PATH"] = os.pathsep.join([bin_dir] + os.environ.get("PATH", "").split(os.pathsep))os.environ["VIRTUAL_ENV"] = base  prev_length = len(sys.path)for lib in "..\\Lib\\site-packages".split(os.pathsep):    path = os.path.realpath(os.path.join(bin_dir, lib))    site.addsitedir(path.decode("utf-8") if "yes" else path)sys.path[:] = sys.path[prev_length:] + sys.path[0:prev_length]sys.real_prefix = sys.prefixsys.prefix = base
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