persistant `LocMemCache` without checking expiry.

locmemcache.py

import sys
from django.core.cache.backends.locmem import LocMemCache as LocMemCache_django


class LocMemCache (LocMemCache_django, ) :
    def __init__ (self, name, params, ) :
        params['max_entries'] = sys.maxint
        super(LocMemCache, self).__init__(name, params, )

    def has_key(self, key, version=None):
        key = self.make_key(key, version=version)
        self.validate_key(key)
        with self._lock.reader() :
            return self._cache.has_key(key, )

        with self._lock.writer():
            try:
                del self._cache[key]
                del self._expire_info[key]
            except KeyError:
                pass

            return False