Почему virtualenv жалуется на пропажу _weakrefset
laptop:~/sandbox$ virtualenv --python=/usr/bin/python2.7 --no-site-packages play
Running virtualenv with interpreter /usr/bin/python2.7
New python executable in play/bin/python2.7
Also creating executable in play/bin/python
Traceback (most recent call last):
File "/home/ribery/sandbox/play/lib/python2.7/site.py",
line 67, in <module>
import os
File "/home/ribery/sandbox/play/lib/python2.7/os.py", line 398,
in <module>
import UserDict
File "/home/ribery/sandbox/play/lib/python2.7/UserDict.py", line 83,
in <module>
import _abcoll
File "/home/ribery/sandbox/play/lib/python2.7/_abcoll.py", line 11,
in <module>
from abc import ABCMeta, abstractmethod
File "/home/ribery/sandbox/play/lib/python2.7/abc.py", line 8,
in <module>
from _weakrefset import WeakSet
ImportError: No module named _weakrefset
ERROR: The executable django-py27/bin/python2.7 is not functioning
ERROR: It thinks sys.prefix is '/home/ribery/sandbox'
(should be '/home/ribery/sandbox/play')
ERROR: virtualenv is not compatible with this system or executable