QCM - Subsection 104.1: Using pandas (Partie 8)

Quiz: QCM - Subsection 104.1: Using pandas (Partie 8)

5 questions | Difficulté: moyen

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Question 1

What is the purpose of the ’..’ in the given import statements?

• A. It refers to a specific function or module
• B. It is used for parent-level relative imports
• C. It denotes a global variable
• D. None of the above

Voir la réponse

Réponse correcte: B

The ’..’ is used for parent-level relative imports. Add more ’.’ with number of levels between the parent and child.

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Question 2

What does the builtin function ‘map()’ return in Python 2?

• A. A list
• B. A generator
• C. None
• D. A tuple

Voir la réponse

Réponse correcte: A

In Python 2, map returns a list.

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Question 3

What is the tie-breaking behavior of the ‘round()’ function in Python 3?

• A. It rounds towards zero
• B. It rounds to the nearest even number (bankers’ rounding)
• C. It rounds up if the number is positive and down if it’s negative
• D. It always returns the same number

Voir la réponse

Réponse correcte: B

In Python 3, round() will return the even integer (aka bankers’ rounding).

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Question 4

What should be passed as an identity function in Python 2 when map is used?

• A. None
• B. Identity function object
• C. Function f(x) = x
• D. Lambda function

Voir la réponse

Réponse correcte: A

In Python 2, None can be passed as an identity function.

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Question 5

What is the advantage of using list comprehensions over map in Python?

• A. List comprehensions are more efficient
• B. Map is not compatible with Python 3
• C. List comprehensions are compatible with both Python 2 and 3
• D. None of the above

Voir la réponse

Réponse correcte: C

Replacing map(str, [1, 2, 3, 4, 5]) with [str(i) for i in [1, 2, 3, 4, 5]] gives the same result and is compatible with both Python 2 and 3.

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