How I delete cache by key?

[Iazzetta]

When I add the django elasticache and connect, works but I can't delete using my old function.

def delete_cache(text):
    for key in list(cache._cache.keys()):
        if text in key:
            cache.delete(key.replace(':1:', ''))

Usage

cache.set('test_123', data, 10000)
cache.set('test_4321', data, 10000)
cache.set('test', data, 10000)

# delete all cache starting by key "test"
delete_cache('test')

But using memcache I got this:

File "/var/app/current/xxx/utils.py", line x, in delete_cache
for key in list(cache._cache.keys()):

AttributeError: 'Client' object has no attribute 'keys'

How do I list Memcached keys?
Thanks