Describe the Use of Lists, Dictionaries, Tuples, Sets, and Strings DATA-ENGINEERING-OPTIMIZE Practice Questions (Page 3)

Questions 11–15

1. 11foundation · easy

   Given `person = {'name': 'Alice', 'age': 30}`, what does `person.get('city', 'Unknown')` return?

   • AAn empty string
   • BA KeyError
   • C'Unknown'
   • DNone
   Reveal Solution Discussion Select an answer first
2. 12application · medium

   A dictionary `sensor_readings` maps sensor IDs to their latest values. The engineer needs to update the value for sensor 'S7' to 42, but only if 'S7' already exists in the dictionary. If it does not exist, no change should be made. Which code snippet accomplishes this?

   • Aif 'S7' in sensor_readings: sensor_readings['S7'] = 42
   • Bsensor_readings.update({'S7': 42})
   • Csensor_readings.setdefault('S7', 42)
   • Dsensor_readings['S7'] = 42
   Reveal Solution Discussion Select an answer first
4. 13application · easy

   A data engineer needs to produce a log message like 'User alice failed 3 times' where the username and count are stored in variables `user` and `count`. Which formatting approach is valid and produces the exact string?

   • Af"User {count} failed {user} times"
   • Bf"User {user} failed {count} times"
   • C"User %s failed %d times" % (count, user)
   • D"User {} failed {} times".format(count, user)
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5. 14foundation · easy

   Which data structure is most appropriate for storing a collection of unique user IDs where order does not matter?

   • ADictionary
   • BList
   • CSet
   • DTuple
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6. 15foundation · easy

   What does `'hello world'.replace('world', 'python')` return?

   • A'python world'
   • B'hello world'
   • C'hello python'
   • D'hello'
   Reveal Solution Discussion Select an answer first