Long-running operations (async responses) in Rest API - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to start an asynchronous operation by sending a POST request.

Rest API

response = requests.post('[1]/start-operation')

Drag options to blanks, or click blank then click option'

Afile://api.example.com

Bftp://api.example.com

Csmtp://api.example.com

Dhttp://api.example.com

Attempts:

3 left

💡 Hint

Common Mistakes

Using unsupported URL schemes like ftp or file.

Forgetting to include the protocol in the URL.

The correct URL scheme for HTTP REST APIs is http://. FTP, file, and SMTP are not used for REST API calls.

2fill in blank

medium

Complete the code to check if the operation status is 'completed'.

Rest API

if status == '[1]':

Drag options to blanks, or click blank then click option'

Acompleted

Bstarted

Cfailed

Dpending

Attempts:

3 left

💡 Hint

Common Mistakes

Checking for 'pending' or 'started' which mean the operation is not done.

Using incorrect status strings.

The operation is finished when the status is completed. Other statuses mean it is still running or failed.

3fill in blank

hard

Fix the error in the code to correctly poll the operation status until it is completed.

Rest API

while status != '[1]':
    time.sleep(5)
    status = get_status(operation_id)

Drag options to blanks, or click blank then click option'

Aerror

Bpending

Ccompleted

Dcancelled

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'pending' or 'error' as the stop condition.

Not updating the status inside the loop.

The loop should continue until the status is completed. Using any other status will cause an infinite loop or wrong behavior.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps operation IDs to their statuses only if the status is 'completed'.

Rest API

completed_ops = {op_id: [1] for op_id, [2] in operations.items() if status == 'completed'}

Drag options to blanks, or click blank then click option'

Astatus

Cresult

Dstate

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect variable names like 'result' or 'state'.

Not matching the variable names in the comprehension.

The dictionary comprehension uses status as the value and iterates over op_id, status pairs.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps uppercase operation IDs to their results only if the result is greater than 0.

Rest API

filtered_results = { [1]: [2] for op_id, [3] in results.items() if [2] > 0 }

Drag options to blanks, or click blank then click option'

Aop_id.upper()

Bresult

Dop_id

Attempts:

3 left

💡 Hint

Common Mistakes

Using the original operation ID instead of uppercase.

Mixing variable names in unpacking and value.

The comprehension uses op_id.upper() as the key, result as the value, and unpacks op_id, result from the dictionary.