Describe the Use of Lists, Dictionaries, Tuples, Sets, and Strings DATA-ENGINEERING-OPTIMIZE Practice Questions (Page 2)

Questions 6–10

1. 6application · medium

   A configuration file defines a fixed set of database connection parameters: host, port, username, and password. These values are loaded once at startup and must not be accidentally modified by other parts of the pipeline. Which data structure should be used to store these parameters?

   • AA tuple, to keep the parameters immutable and ordered
   • BA list, so the parameters can be easily reordered
   • CA set, to ensure all parameters are unique
   • DA dictionary, so the parameters can be updated at runtime
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2. 7application · easy

   A data engineer has a string `data = 'a,b,c,d'` and needs to transform it into the string `'a;b;c;d'`. Which string method should be used?

   • Adata.strip(',')
   • Bdata.join(';')
   • Cdata.replace(',', ';')
   • Ddata.split(',')
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4. 8foundation · easy

   What is the result of `len((1, 2, 3, 4))`?

   • A3
   • B5
   • C4
   • DA TypeError
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5. 9foundation · easy

   Which method returns a view of all the keys in a dictionary?

   • Avalues()
   • Bitems()
   • Ckeys()
   • Dget()
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6. 10foundation · easy

   How do you add the key-value pair `'color': 'blue'` to an existing dictionary `car`?

   • Acar['color'] = 'blue'
   • Bcar.append('color', 'blue')
   • Ccar.insert('color', 'blue')
   • Dcar.add('color', 'blue')
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