Django get or set Cache pattern

caching_tools.py

from django.core.cache import cache

# Here, you can centralize sanitation of cache key.
# There was a python memcache bug were spaces in keys were generating exceptions, so we replace it
# You could add any other code to fix keys here
def sanitize_cache_key(cache_key):
	key = cache_key
	if key and len(key) >0:
		key = key.replace(' ','%20')
	return key
	
# cache_key: string for the cache key
# timeout: you cache timeout
# fn: a function to execute if cache is empty and that returns data
# args: a tule of the arguments to pass to the function
def get_set_cache(cache_key,timeout,fn,args):
	cache_name = sanitize_cache_key(cache_key)	
	content = cache.get(cache_name)
	if content is None:
		content = fn(*args)
		if content:
			cache.set(cache_name,content,timeout)
	return content

# Example

def get_user_stuff(user,other_data):
	cache_name = "user_%d_stuff_%d" % (user.id,other_data.id)
	return get_set_cache(cache_name,60*60,_get_user_stuff,(user,other_data))

def _get_user_stuff(user,other_data):
	
	some_data = ... # long running fetching of some data that depends on user and other_DATA
	return some_data