[Answer]-Compare and set using cache in django

If you are using the generic Django caching framework, this is not possible. If you are only using MemCache, this question on Django Memcache: Compare and Set contains all you need.

However, be advised that while CAS solves the problem of multiple users setting the same cache value, this is only a problem in high traffic environments. If simultaneous cache-miss-and-updates occur once or twice per month, you’d be better off ignoring CAS.

If the cached value is really expensive to calculate, you could also think of a separate background task that calculates the result, stores it in the cache, and runs just before the cache expiry. In this case, your users would never experience a cache miss and the entire CAS-issue becomes irrelevant.