Expiration-based caching in Rest API - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the cache expiration time to 60 seconds.

Rest API

cache.set('user_data', data, expire=[1])

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A60

B600

C6

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using 0 which means no expiration.

Using 600 which is 10 minutes, not 1 minute.

The expiration time is set in seconds. 60 means the cache will expire after one minute.

2fill in blank

medium

Complete the code to check if the cached data has expired before returning it.

Rest API

if cache.get('user_data') is not [1]:
    return cache.get('user_data')

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A0

BFalse

CTrue

DNone

Attempts:

3 left

💡 Hint

Common Mistakes

Checking for False instead of None.

Using 0 which is a valid value but not the absence of data.

When cache.get returns None, it means the data is not in cache or expired.

3fill in blank

hard

Fix the error in the code to correctly update the cache with new data and expiration.

Rest API

cache.[1]('user_data', new_data, expire=120)

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Aset

Bupdate

Cput

Dadd

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'update' which may not exist.

Using 'add' which might only add if key doesn't exist.

The correct method to store data with expiration is 'set'.

4fill in blank

hard

Fill both blanks to create a cache dictionary comprehension that stores word lengths only for words longer than 3 characters.

Rest API

cache_data = {word: [1] for word in words if len(word) [2] 3}

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Alen(word)

B>

C<=

Dword

Attempts:

3 left

💡 Hint

Common Mistakes

Using the word itself as value instead of its length.

Using '<=' instead of '>' causing wrong filtering.

We want the length of each word (len(word)) and only include words longer than 3 characters (len(word) > 3).

5fill in blank

hard

Fill all three blanks to create a cache dictionary comprehension that stores uppercase words as keys and their lengths as values, only if length is greater than 4.

Rest API

cache_data = { [1]: [2] for word in words if len(word) [3] 4 }

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Aword.upper()

Blen(word)

C>

Dword.lower()

Attempts:

3 left

💡 Hint

Common Mistakes

Using word.lower() instead of word.upper() for keys.

Using '<' instead of '>' in the condition.

The keys are uppercase words (word.upper()), values are their lengths (len(word)), and we filter words longer than 4 characters (len(word) > 4).