Which statement about tuples is true?

Tuples are immutable, so their elements cannot be changed after creation.

Tuples are defined using curly braces.

Tuples are unordered collections of unique elements.

Tuples can be modified using the append() method.

A dictionary `config` contains nested settings. The engineer needs to retrieve the value of the key 'timeout' from the nested dictionary stored under the key 'network'. If 'network' or 'timeout' does not exist, the code should return a default value of 30. Which expression achieves this safely?

config.get('network', {}).get('timeout', 30)

config['network'].get('timeout', 30)

A data engineer maintains a dictionary `user_scores` that maps user IDs to their scores. The engineer needs to increment the score for user 'U42' by 10. If 'U42' is not in the dictionary, it should be added with a score of 10. Which code snippet accomplishes this correctly and efficiently?

user_scores.setdefault('U42', 0) + 10

user_scores['U42'] = user_scores.get('U42', 0) + 10

if 'U42' in user_scores: user_scores['U42'] += 10 else: user_scores['U42'] = 10

Dell Data Engineering Optimize

Domain 6Objective 2

Describe the Use of Lists, Dictionaries, Tuples, Sets, and Strings DATA-ENGINEERING-OPTIMIZE Practice Questions (Page 4)

Part of the Building Data Pipelines with Python domain, which accounts for 20% of the DATA-ENGINEERING-OPTIMIZE exam.

24questions here

5free pages

9concepts

20%of the exam

Questions 16–20

16foundation · easy
You need to store configuration settings where each setting has a name and a value. Which data structure is most appropriate?
Select an answer first
17foundation · easy
Which statement about tuples is true?
Select an answer first
18application · medium
A dictionary `config` contains nested settings. The engineer needs to retrieve the value of the key 'timeout' from the nested dictionary stored under the key 'network'. If 'network' or 'timeout' does not exist, the code should return a default value of 30. Which expression achieves this safely?
Select an answer first
19expert · medium
A data engineer maintains a dictionary `user_scores` that maps user IDs to their scores. The engineer needs to increment the score for user 'U42' by 10. If 'U42' is not in the dictionary, it should be added with a score of 10. Which code snippet accomplishes this correctly and efficiently?
Select an answer first
20foundation · easy
Which method adds an element to a set?
Select an answer first

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Describe the Use of Lists, Dictionaries, Tuples, Sets, and Strings DATA-ENGINEERING-OPTIMIZE Practice Questions (Page 4)

Questions 16–20

You need to store configuration settings where each setting has a name and a value. Which data structure is most appropriate?

Which statement about tuples is true?

A dictionary `config` contains nested settings. The engineer needs to retrieve the value of the key 'timeout' from the nested dictionary stored under the key 'network'. If 'network' or 'timeout' does not exist, the code should return a default value of 30. Which expression achieves this safely?

A data engineer maintains a dictionary `user_scores` that maps user IDs to their scores. The engineer needs to increment the score for user 'U42' by 10. If 'U42' is not in the dictionary, it should be added with a score of 10. Which code snippet accomplishes this correctly and efficiently?

Which method adds an element to a set?

Keep studying — Building Data Pipelines with Python