[Solved] Consider this code snippet for fetching paginated data using cursor-based pagination:cursor = None while True: response = api.get_items(cursor=cursor) process(response.data) cursor = response.... | Rest API

Rest API - Pagination Patterns

Consider this code snippet for fetching paginated data using cursor-based pagination:

cursor = None
while True:
    response = api.get_items(cursor=cursor)
    process(response.data)
    cursor = response.next_cursor
    if not cursor:
        break

What is the likely bug in this code?

AIt processes data before fetching

BIt does not check if <code>next_cursor</code> exists before assigning

CIt never updates the cursor value

DIt may cause an infinite loop if <code>next_cursor</code> is empty string

Step-by-Step Solution

Solution:

Step 1: Analyze the code structure
The code fetches data, processes it, then assigns cursor = response.next_cursor without checking if next_cursor is empty string.
Step 2: Potential infinite loop
If next_cursor is an empty string, the condition if not cursor will be true and break the loop, so no infinite loop occurs. But if the check is incorrect or cursor is None, it breaks. However, the main issue is if next_cursor is missing, it raises an error.
Step 3: Proper handling
Should check if next_cursor exists and is truthy before assigning and breaking.
Final Answer:
It may cause an infinite loop if next_cursor is empty string -> Option D
Quick Check:
Check for empty or missing cursor carefully [OK]

Quick Trick: Check for empty or missing cursor carefully [OK]

Common Mistakes:

Assuming next_cursor always exists
Not breaking loop on missing cursor
Updating cursor after break

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Consider this code snippet for fetching paginated data using cursor-based pagination:

Step 1: Analyze the code structure

Step 2: Potential infinite loop

Step 3: Proper handling

Final Answer:

Quick Check:

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