Python 2.6.1 (r261:67515, Feb 11 2010, 00:51:29) 
Type "copyright", "credits" or "license" for more information.

IPython 0.9.1 -- An enhanced Interactive Python.

In [1]: from myapp.blogs.models import Entry

In [2]: from django.core.cache import cache

In [3]: e = Entry.live.order_by('-release_date')[:10]

In [4]: cache.set('temp', e, 10)
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)

/path/to/myapp/<ipython console> in <module>()

/path/to/django/core/cache/backends/memcached.pyc in set(self, key, value, timeout)
     52 
     53     def set(self, key, value, timeout=0):
---> 54         self._cache.set(smart_str(key), value, self._get_memcache_timeout(timeout))
     55 
     56     def delete(self, key):

/path/to/myvirtualenv/lib/python2.6/site-packages/memcache.pyc in set(self, key, val, time, min_compress_len)
    513         indicating don't ever try to compress.
    514         '''
--> 515         return self._set("set", key, val, time, min_compress_len)
    516 
    517 

/path/to/myvirtualenv/lib/python2.6/site-packages/memcache.pyc in _set(self, cmd, key, val, time, min_compress_len)
    723         self._statlog(cmd)
    724 
--> 725         store_info = self._val_to_store_info(val, min_compress_len)
    726         if not store_info: return(0)
    727 

/path/to/myvirtualenv/lib/python2.6/site-packages/memcache.pyc in _val_to_store_info(self, val, min_compress_len)
    695             if self.persistent_id:
    696                 pickler.persistent_id = self.persistent_id
--> 697             pickler.dump(val)
    698             val = file.getvalue()
    699 

TypeError: expected string or Unicode object, NoneType found