Python Basics XK0-006 Practice Questions (Page 3)

Questions 11–15

1. 11application · medium

   A script needs to store the MAC addresses of all devices on a network. The script must ensure that each MAC address is stored only once, and later it must quickly check if a given MAC address is present. Which data structure is most appropriate?

   • AA dictionary, because it can map MAC addresses to additional information.
   • BA set, because it automatically removes duplicates and provides O(1) average membership testing.
   • CA list, because it can store multiple values and supports indexing.
   • DA tuple, because it is immutable and hashable.
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2. 12foundation · easy

   Which of the following is a valid Python boolean value?

   • A0
   • B1
   • CTrue
   • Dyes
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4. 13foundation · easy

   Which Python keyword is used to define a function?

   • Afunc
   • Blambda
   • Cfunction
   • Ddef
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5. 14application · medium

   A developer is working on a Python project that requires a specific version of the `flask` package. The developer wants to ensure that other projects on the same system are not affected by version changes. Which command sequence should be used?

   • A`python3 -m venv venv && source venv/bin/activate && pip install flask==2.0.1`
   • B`sudo apt install python3-flask`
   • C`pip install --upgrade flask`
   • D`pip install flask==2.0.1`
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6. 15application · medium

   A Python script reads a configuration value from a file. The value is read as a string, but the script needs to perform arithmetic on it. The script currently does: `value = open('config.txt').read().strip()` and then `result = value * 2`. The output is `'1010'` instead of `20`. What is the most likely cause?

   • AThe file contains the string '10' with a newline, and `strip()` removes the newline but leaves it as a string.
   • BThe script should use `float(value)` instead of `int(value)`.
   • CThe variable `value` is a string, so `*` performs string repetition instead of numeric multiplication.
   • DThe `*` operator is not defined for strings.
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