Solutions

Quiz 01

Pseudocode:

set EXCHANGE_RATE = 1.0984
set FEE = 20
ask for name
ask for amount in CAD
display Hello, user
set result = (amount - FEE) * EXCHANGE_RATE
round result to 2 decimal points
display result

Python code:

EXCHANGE_RATE = 1.0984  # Australian dollars
FEE = 20  # Management fee

name = input("Who are you? ")
amount = float(input("Enter amount in CAD, $20 minimum: "))
print("Hello,", name, ".")

result = (amount - FEE) * EXCHANGE_RATE
result = round(result, 2)
print("Your $", amount, "CAD will buy you", result, "in AUD.")

Quiz 03

def exposure_limit(noise_level: float, base_level=85) -> float:
    '''Args:
        noise_level (float): how loud environment is in dBA 
        base_level (float, optional): ‘safe’ level, default = 85 dBA
      Returns:
        float: The permitted duration of exposure, in hrs. -1 if no time limit
    '''
    exposure = noise_level - base_level

    if exposure <= 0:
        result = -1
    else:
        if exposure <= 3:
            result = 4
        else:
            if exposure <= 9:
                result = 1
            else:
                result = 0.25

    return result

Quiz 04

def smallest_items(any_list: list, k: int) -> list:
    """
    Args: any non-empty list of numbers and
    an integer k that must be less than the length of the list
    Returns a sub-list of items from the passed list
    that the k smallest.
    """
    sorted_list = sorted(any_list)
    return sorted_list[:k]

iteration = 5
while iteration < 26:
    print(iteration)
    iteration += 5

# Is equivalent to this
for iteration in range(5, 26, 5):
    print(iteration)

a = [1,2,3,4,5,6]
for index in range(len(a)-2):
    print(a[index])

# Is equivalent to this
a = [1, 2, 3, 4, 5, 6]
index = 0
while index < len(a) - 2:
    print(a[index])
    index += 1

List c looks like: [[4, 40], [3, 30], [2, 20], [1, 10]]
and the value at c[2][0] has a value of: 2

Quiz 05

def csv_to_2d_list(filename: str) -> list[list]:
    """
    Takes a csv filename as string and turns it into a 2D list.
    Returns a 2D list.
    """
    result = []
    f = open(filename, "r")

    for line in f:
        line = line.strip()
        columns = line.split(",")
        row = []

        for item in columns:
            item = item.strip()

            if item.lower() == "yes":
                row.append(True)
            elif item.lower() == "no":
                row.append(False)
            else:
                try:
                    number = int(item)
                    row.append(number)
                except ValueError:
                    row.append(item)

        result.append(row)

    f.close()
    return result


def swap_col_rows(data: list[list], filename: str) -> None:
    """
    Swaps rows and columns of a given 2D list and
    writes the content into a file with each row on a separate line.
    """
    num_cols = len(data[0])
    num_rows = len(data)

    swapped = []

    for col_index in range(num_cols):
        row = []
        for row_index in range(num_rows):
            row.append(data[row_index][col_index])
        swapped.append(row)

    f = open(filename, "w")
    for row in swapped:
        row_list = []
        for item in row:
            row_list.append(str(item))
        f.write(",".join(row_list) + "\n")
    f.close()


def main() -> None:
    result = csv_to_2d_list("marx.csv")
    swap_col_rows(result, "brothers.csv")


main()