:tocdepth: 1

The Python Workbook Solutions
=============================

.. contents:: Contents


Introduction to Programming - TPW
---------------------------------

Exercise 1: Mailing Address
^^^^^^^^^^^^^^^^^^^^^^^^^^^
I suggest first printing the information of the school (not your personal information). Then, refactoring those strings into variables. Do not store formatting characters (spaces and commas) in your variables!

**Part 1 Solution:**

.. code-block:: python

    print("St. Robert Catholic High School")
    print("8101 Leslie St.")
    print("Thornhill, ON")
    print("L3T 7P4")
    print("905-889-4982")


**Part 2 Solution:**

.. code-block:: python

    name = "St. Robert Catholic High School"
    address = "8101 Leslie St."
    city = "Thornhill"
    province = "ON"
    postal_code = "L3T 7P4"
    telephone = "905-889-4982"

    print(name)
    print(address)

    print(f"{city}, {province}")
    print("{}, {}".format(city, province))
    # which formatting method do you prefer?

    print(postal_code)
    print(telephone)



Exercise 2: Hello
^^^^^^^^^^^^^^^^^
.. code-block:: python

    name = input("Please enter your name: ")
    print(f"Hello, {name}. Nice to meet you!")

    # ---- Extra ----
    mood = input("How are you feeling? ")

    # ----- ADVANCED----
    if mood == "good":
        print("Blessed.")
    elif mood == "bad":
        print("Aww. It will get better!")
    elif mood == "criminal":
        print("Calling police...")
    else:
        print("Ok. Bye.")


Exercise 4: Area of a Field
^^^^^^^^^^^^^^^^^^^^^^^^^^^
.. code-block:: python

    print("Calculate the acreage of a field.")
    print("Enter dimensions in feet.")

    length = int(input("Length: "))
    width = int(input("Width: "))

    sq_feet = length * width
    acres = sq_feet / 43560

    print(f"The field is {acres} acres.")


Exercise 5: Bottle Deposits
^^^^^^^^^^^^^^^^^^^^^^^^^^^
.. code-block:: python

    print("Bottle Refund Calculator")
    print("=" * 24)
    print()

    num_small = int(input("Enter number of small bottles: "))
    num_large = int(input("Enter number of large bottles: "))

    refund_small = num_small * 0.10
    refund_large = num_large * 0.25
    refund_total = refund_small + refund_large

    print()
    print("Refund: ${}".format(refund_total))


If Statements - TPW
-------------------

Exercise 34: Even or odd?
^^^^^^^^^^^^^^^^^^^^^^^^^
.. code-block:: python

    num = int(input("Enter a number: "))

    if num % 2 == 0:
        print("Even")
    else:
        print("Odd")



Exercise 35: Dog Years
^^^^^^^^^^^^^^^^^^^^^^
.. code-block:: python

    # get age of dog (in years)
    age = float(input("How old is your dog? "))

    # if the age is negative, display an error message
    if age < 0:
        print("Invalid number!")
    else:
        if age <= 2:
            dog_years = age * 10.5
        else:
            first_two = 2 * 10.5
            remaining_years = age - 2

            dog_years = first_two + remaining_years * 4
        
        print(f"Your dog is {dog_years} years old in dog-years.")



Exercise 36: Vowel or Consonant
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.. code-block:: python

    letter = input("Enter a letter: ")

    if letter == "a":
        print("Vowel")
    elif letter == "e":
        print("Vowel")
    elif letter == "i":
        print("Vowel")
    elif letter == "o":
        print("Vowel")
    elif letter == "u":
        print("Vowel")
    elif letter == "y":
        print("Y is sometimes a vowel")
    else:
        print("Consonant")

.. code-block:: python

    letter = input("Enter a letter: ")

    if letter == "a" or letter == "e" or letter == "i" or letter == "o" or letter == "u":
        print("Vowel")
    else:
        print("Consonant")


Exercise 37: Name that Shape
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.. code-block:: python

    sides = int(input("Number of sides: "))

    if sides == 3:
        print("Triangle")
    elif sides == 4:
        print("Quadrilateral")
    elif sides == 5:
        print("Pentagon")
    elif sides == 6:
        print("Hexagon")
    elif sides == 7:
        print("Heptagon")
    elif sides == 8:
        print("Octagon")
    elif sides == 9:
        print("Nonagon")
    elif sides == 10:
        print("Decagon")
    else:
        print("Not valid.")


Functions - TPW
---------------

Exercise 81: Compute the Hypotenuse
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.. code-block:: python

    from math import sqrt


    def hypotenuse(a, b):
        """Returns the length of the hypotenuse of a right-angle triangle.

        Args:
            a (float): Length of side A
            b (float): Length of side B

        Return:
            float: length of Hypotenuse
        """
        return sqrt(a*a + b*b)


    def main():
        print("Welcome to the Hypotenuse calculator")
        a = float(input("Enter side A:"))
        b = float(input("Enter side B:"))
        hypot = hypotenuse(a, b)
        print("The hypotenuse is: {}".format(hypot))


    if __name__ == "__main__":
        main()



Exercise 82: Taxi Fare
^^^^^^^^^^^^^^^^^^^^^^
.. code-block:: python

    BASE_FARE = 4.00
    RATE_PER_140_METERS = 0.25


    def calc_fare(distance):
        """Calculates taxi fare based on distance traveled (km)
        Args:
            distance (float): Distance traveled in Kilometers.
        Return:
            float: The fare for the taxi ride.
        """
        return BASE_FARE + RATE_PER_140_METERS * (distance // 0.140)


    def tests():
        assert calc_fare(0) == BASE_FARE, "Should charge base-fare."
        assert calc_fare(0.05) == BASE_FARE, "Should not round up until you reach 140 meters."
        assert calc_fare(0.14) == BASE_FARE + RATE_PER_140_METERS, "Should add the first 25 cents."
        assert calc_fare(0.28) == BASE_FARE + 2*RATE_PER_140_METERS, "Should add the second 25 cents."
        print("Passed all tests!")


    def main():
        print("Welcome to the fare calculator.")
        distance = float(input("Enter the number of meteres traveled:"))
        distance_in_km = distance / 1000
        fare = calc_fare(distance_in_km)
        print("The total fare is ${}.".format(fare))

    tests()
    main()


Lists - TPW
-----------
Exercise 105: Reverse Order
^^^^^^^^^^^^^^^^^^^^^^^^^^^
.. code-block:: python
 
    numbers = []

    while True:
        num = int(input("Enter a number, 0 to stop: "))
        if num == 0:
            break
        numbers.append(num)

    # loop over reversed list
    for number in reversed(numbers):
        print(number)

    # for loop over the range from len-1 to 0
    for i in range(len(numbers)-1, -1, -1):
        print(numbers[i])

    # while loop
    i = len(numbers) - 1
    while i >= 0:
        print(numbers[i])
        i -= 1

    # for loop over slice
    for number in numbers[::-1]:
        print(number)