PCPP1 Networking And Restful Apis Practice Question
You are consuming a REST API that returns data in JSON format. After calling response.json(), you notice the data contains nested dictionaries. What is the most Pythonic way to handle a missing key in the response dictionary safely?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use response.json().get('key', default_value)
The dict.get() method provides a way to access a key with a default value if the key does not exist, preventing a KeyError.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Wrap the access in a try-except KeyError block
Why it's wrong here
While safe, it is less concise than .get() for simple defaults.
- ✗
Check 'if 'key' in response.json():' before access
Why it's wrong here
This is redundant when .get() is available.
- ✗
Use response.json()['key'] and assume the API schema is always correct
Why it's wrong here
This leads to runtime exceptions if the API response changes.
- ✓
Use response.json().get('key', default_value)
Why this is correct
This is the idiomatic way to handle optional keys in dictionaries.
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Python Institute exam blueprint
This PCPP1 practice question is part of Courseiva's free Python Institute certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCPP1 exam.