"""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: 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("__BIN_NAME__") - 1] # strip away the bin part from the __file__, plus the path separator # prepend bin to PATH (this file is inside the bin directory) os.environ["PATH"] = os.pathsep.join([bin_dir] + os.environ.get("PATH", "").split(os.pathsep)) os.environ["VIRTUAL_ENV"] = base # virtual env is right above bin directory # add the virtual environments libraries to the host python import mechanism prev_length = len(sys.path) for lib in "__LIB_FOLDERS__".split(os.pathsep): path = os.path.realpath(os.path.join(bin_dir, lib)) site.addsitedir(path.decode("utf-8") if "__DECODE_PATH__" else path) sys.path[:] = sys.path[prev_length:] + sys.path[0:prev_length] sys.real_prefix = sys.prefix sys.prefix = base