The task is to determine which command correctly outputs the page_id value from the JSON payload shown in the Python 3.7 script. Let's analyze the options and the payload structure to verify the correct answer.
* JSON Payload Analysis:
* The JSON payload provided in the exhibit shows that items is a key in the top-level dictionary.
* The value of items is a list of dictionaries, and each dictionary contains various keys, including page_id.
* Code Analysis:
* The JSON data returned by the get_json function is assigned to the variable items.
* The goal is to access the page_id key within the first dictionary of the list associated with the items key.
* Options Analysis:
* Option A: print(items['items']['page_id'])
* This will not work because items['items'] is a list, not a dictionary. Attempting to access
['page_id'] directly from a list will result in a TypeError.
* Option B: print(items.get('items').get('page_id'))
* This will also not work for the same reason as Option A. items.get('items') returns a list, and calling .get('page_id') on a list is invalid.
* Option C: print(items.get('items')[0].get('page_id'))
* This is correct. items.get('items') returns the list, [0] accesses the first element of the list (which is a dictionary), and .get('page_id') retrieves the value of the page_id key from that dictionary.
* Option D: print(items['items']['page_id'].keys())
* This will fail because items['items'] is a list and does not have a keys() method.
Correct Explanation:
* The JSON structure contains a list under the key items.
* To access page_id, we first need to get the first dictionary in this list ([0]).
* We then access the page_id key in this dictionary.
Example:
print(items.get('items')[0].get('page_id'))
This code correctly navigates through the structure and retrieves the value associated with page_id.
References:
* Python Documentation on Dictionaries: Python Docs
* JSON Data Handling in Python: Python JSON