Low-level cache API in Django - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of Django's low-level cache API?

It allows you to store and retrieve data directly in the cache, giving you fine control over caching behavior beyond automatic caching.

beginner

Which function is used to add a new key-value pair to the cache only if the key does not already exist?

cache.add(key, value, timeout=None) adds the key only if it is not already in the cache.

beginner

How do you retrieve a value from the cache with a default if the key is missing?

Use cache.get(key, default=None). It returns the cached value or the default if the key is not found.

beginner

What does cache.set(key, value, timeout=None) do?

It stores the value under the given key in the cache. The optional timeout sets how long the value stays cached.

beginner

How can you delete a cached value using the low-level cache API?

Use cache.delete(key) to remove the value associated with the key from the cache.

Which Django cache function adds a key only if it does not exist?

A cache.add()

B cache.set()

C cache.get()

D cache.delete()

cache.add() adds a key only if it is not already present in the cache.

What happens if you use cache.get() with a key that is not in the cache and no default is provided?

A Returns an empty string

B Raises an error

C Returns None

D Returns False

cache.get() returns None if the key is missing and no default is given.

How do you specify how long a value stays in the cache when using cache.set()?

A By setting the <code>duration</code> parameter

B By setting the <code>limit</code> parameter

C By setting the <code>expiry</code> parameter

D By setting the <code>timeout</code> parameter

The timeout parameter controls how many seconds the value stays cached.

Which function removes a key and its value from the cache?

A cache.delete()

B cache.pop()

C cache.clear()

D cache.remove()

cache.delete() removes the key and its value from the cache.

If you want to update a cached value regardless of whether it exists, which function do you use?

A cache.get()

B cache.set()

C cache.add()

D cache.update()

cache.set() stores or updates the value for a key in the cache.

Explain how to store, retrieve, and delete data using Django's low-level cache API.

Think about the basic cache operations: save, read, and remove.

Describe the difference between cache.add() and cache.set() in Django's low-level cache API.

Consider when you want to avoid overwriting existing cache data.