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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 os
- import site
- import sys
-
- try:
- __file__
- except NameError:
- raise AssertionError("You must use exec(open(this_file).read(), {'__file__': this_file}))")
-
- # prepend bin to PATH (this file is inside the bin directory)
- bin_dir = os.path.dirname(os.path.abspath(__file__))
- os.environ["PATH"] = os.pathsep.join([bin_dir] + os.environ.get("PATH", "").split(os.pathsep))
-
- base = os.path.dirname(bin_dir)
-
- # virtual env is right above bin directory
- os.environ["VIRTUAL_ENV"] = base
-
- # add the virtual environments site-package to the host python import mechanism
- IS_PYPY = hasattr(sys, "pypy_version_info")
- IS_JYTHON = sys.platform.startswith("java")
- if IS_JYTHON:
- site_packages = os.path.join(base, "Lib", "site-packages")
- elif IS_PYPY:
- site_packages = os.path.join(base, "site-packages")
- else:
- IS_WIN = sys.platform == "win32"
- if IS_WIN:
- site_packages = os.path.join(base, "Lib", "site-packages")
- else:
- site_packages = os.path.join(base, "lib", "python{}".format(sys.version[:3]), "site-packages")
-
- prev = set(sys.path)
- site.addsitedir(site_packages)
- sys.real_prefix = sys.prefix
- sys.prefix = base
-
- # Move the added items to the front of the path, in place
- new = list(sys.path)
- sys.path[:] = [i for i in new if i not in prev] + [i for i in new if i in prev]
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