1 """By using execfile(this_file, dict(__file__=this_file)) you will

     2 activate this virtualenv environment.

     3 

     4 This can be used when you must use an existing Python interpreter, not

     5 the virtualenv bin/python

     6 """

     7 

     8 try:

     9     __file__

    10 except NameError:

    11     raise AssertionError(

    12         "You must run this like execfile('path/to/active_this.py', dict(__file__='path/to/activate_this.py'))")

    13 import sys

    14 import os

    15 

    16 base = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))

    17 site_packages = os.path.join(base, 'lib', 'python%s' % sys.version[:3], 'site-packages')

    18 prev_sys_path = list(sys.path)

    19 import site

    20 site.addsitedir(site_packages)

    21 sys.real_prefix = sys.prefix

    22 sys.prefix = base

    23 # Move the added items to the front of the path:

    24 new_sys_path = []

    25 for item in list(sys.path):

    26     if item not in prev_sys_path:

    27         new_sys_path.append(item)

    28         sys.path.remove(item)

    29 sys.path[:0] = new_sys_path