+
−"""By using execfile(this_file, dict(__file__=this_file)) you will
+
−activate this virtualenv environment.
+
−
+
−This can be used when you must use an existing Python interpreter, not
+
−the virtualenv bin/python
+
−"""
+
−
+
−try:
+
−    __file__
+
−except NameError:
+
−    raise AssertionError(
+
−        "You must run this like execfile('path/to/active_this.py', dict(__file__='path/to/activate_this.py'))")
+
−import sys
+
−import os
+
−
+
−base = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+
−site_packages = os.path.join(base, 'lib', 'python%s' % sys.version[:3], 'site-packages')
+
−prev_sys_path = list(sys.path)
+
−import site
+
−site.addsitedir(site_packages)
+
−sys.real_prefix = sys.prefix
+
−sys.prefix = base
+
−# Move the added items to the front of the path:
+
−new_sys_path = []
+
−for item in list(sys.path):
+
−    if item not in prev_sys_path:
+
−        new_sys_path.append(item)
+
−        sys.path.remove(item)
+
−sys.path[:0] = new_sys_path