Count elements

Create a function that takes a vector of numbers and a target value as input and returns the count of occurrences of the target value in the vector.

Here, a vector is a one-dimensional Python list of numbers. Count values equal to the target using ==; an empty list returns 0. Keep the input unchanged.

Complete the supplied function in Listing 1. Keep its signature and use the checks below it.

Listing 1: Starter function and supplied checks for count elements.

def count_elements(vector: list[float], target: float) -> int:
    # Add code here!
    pass


def test_count_elements() -> None:
    # Input list 1
    vector1 = [1, 2, 3, 2, 4, 2]

    # Input list 2
    vector2 = [1, 2, 3, 4, 5]

    assert count_elements(vector1, 2) == 3
    assert count_elements(vector2, 6) == 0


test_count_elements()

TipHint

len(values) returns the number of elements, so len([3, 7]) is 2 and len([]) is 0. List indexing starts at 0: [3, 7][0] is 3. An index must refer to an existing element.

assert condition stops the check with an AssertionError when the condition is false.