PCEP Section 3B: list methods: append(), insert(), index()

Which method is used to add an element to the end of a list in Python?

• insert()

• append()

• index()

• extend()

What does the len() function return when used on a list?

• The sum of all elements in the list

• The number of elements in the list

• The last element of the list

• The type of the list

Which of the following is the correct way to access the third element in a list called my_list?

• my_list[2]

• my_list(3)

• my_list[3]

• my_list{2}

What does the del instruction do in Python when used with a list element?

• Deletes the entire list

• Removes a specific element from the list

• Adds a new element to the list

• Sorts the list

Which operator would you use to check if an element is not present in a list?

• in

• not

• not in

• is not

What is the result of the following code? ```python numbers = [1, 2, 3] numbers.insert(1, 10) print(numbers) ```

• [1, 10, 2, 3]

• [10, 1, 2, 3]

• [1, 2, 3, 10]

• [1, 2, 10, 3]

Given the list `a = [4, 2, 7, 1]`, which of the following will return a sorted version of the list without changing the original list?

• a.sort()

• sorted(a)

• a[::-1]

• a.append(5)

How would you create a list of squares of numbers from 0 to 4 using a list comprehension?

• [x^2 for x in range(5)]

• [x*x for x in range(5)]

• [x**2 for x in range(5)]

• Both B and C

Which of the following statements correctly clones a list `original` so that changes to the new list do not affect the original?

• new_list = original

• new_list = original[:]

• new_list = list(original)

• Both B and C

Given the list `matrix = [[1, 2], [3, 4]]`, what is the value of `matrix[1][0]`?

• 1

• 2

• 3

• 4