执行python manage.py crontab add报错，麻烦看一下，歇歇。

[wangrui0435]

[root@saltstack-master-1 2.1.3]# python manage.py crontab add
Traceback (most recent call last):
File "manage.py", line 8, in
from django.core.management import execute_from_command_line
File "/usr/lib/python2.6/site-packages/django/init.py", line 1, in
from django.utils.version import get_version
File "/usr/lib/python2.6/site-packages/django/utils/version.py", line 7, in
from django.utils.lru_cache import lru_cache
File "/usr/lib/python2.6/site-packages/django/utils/lru_cache.py", line 28
fasttypes = {int, str, frozenset, type(None)},
^
SyntaxError: invalid syntax