Lab 3e — Tuples

Highest Temperature

10 minutes

Write a function called convert_to_fahrenheit(temperatures). This function should take in a list of temperatures, where every temperature is a tuple (city, state, temperature, measurement). If the measurement is 'Celsius' change the temperature to be in Fahrenheit. This function should return a list of tuples, where every tuple consist of (city, state, temperature).

Use this code to convert from Celsius to Fahrenheit round(temperature * (9/5) + 32)

Next, write a function called find_highest_temp(temperatures). This function takes a list of temperatures, where each temperature is a tuple (city, state, temperature). This function should return the tuple that has the highest temperture.

You have starter code in temperatures.py:

def find_highest_temp(temperatures):
    # Write code here
    pass


def convert_to_fahrenheit(temperatures):
    # Write code here
    pass


def main():
    # https://en.wikipedia.org/wiki/U.S._state_and_territory_temperature_extremes
    temperatures = [('Centreville', 'Alabama', 112, 'Fahrenheit'), ('Ozark', 'Arkansas', 48.9, 'Celsius'),
                    ('Phoenix', 'Arizona', 53.3, 'Celsius'), ('Millsboro', 'Delaware', 106, 'Fahrenheit'),
                    ('Collegeville', 'Indiana', 46.7, 'Celsius'), ('Lake Powell', 'Utah', 48.9, 'Celsius')]
    temperatures = convert_to_fahrenheit(temperatures)
    city, state, temp = find_highest_temp(temperatures)
    print(f"The highest temperature in the US was recorded in {city} {state}, at {temp} degrees Fahrenheit!")


if __name__ == '__main__':
    main()

The list of scores is coded into the program, so the output should be:

The highest temperature in the US was recorded in Phoenix Arizona, at 128 degrees Fahrenheit!

If you need help, look at find_max() in the guide on lists of tuples.

Discussion with TA:

• What pattern is this?
• What does None mean?

Ice Cream

15 minutes

A bunch of your friends rated three ice cream flavors on a scale from 1 to 10:

ratings = [('chocolate', 10), ('vanilla', 8.5), ('huckleberry', 6),
           ('chocolate', 9), ('banana nut', 9.3), ('vanilla', 7.5),
           ('huckleberry', 9.3), ('banana nut', 7.5), ('chocolate', 8),
           ('chocolate', 8), ('banana nut', 10), ('vanilla', 4.1),
           ('chocolate', 10), ('huckleberry', 10), ('vanilla', 10)]

They are really picky, so some of the scores are floats!

You need to write two functions:

• First, ratings_for_flavor(ratings, requested_flavor) takes a list of ratings, which are tuples like above, and a requested flavor. The function returns a list of tuples that are ratings for that flavor. So if the requested flavor is ‘chocolate’, the returned list should have only ratings for chocolate ice cream.

• Second, get_average(ratings) takes a list of ratings, which are tuples like above, and returns the average score for all of the ratings in the list. The average should be rounded to one decimal place. Information on rounding can be found in the guide for floats.

The rest of the code is given to you in ice_cream.py:

def ratings_for_flavor(ratings, requested_flavor):
    # Write code here
    pass


def get_average(ratings):
    # Write code here
    pass


def print_info(ratings, flavor):
    average = get_average(ratings)
    print(f"The average score for {flavor} is {average}.")


def main():
    ratings = [('chocolate', 10), ('vanilla', 8.5), ('huckleberry', 6),
               ('chocolate', 9), ('banana nut', 9.3), ('vanilla', 7.5),
               ('huckleberry', 9.3), ('banana nut', 7.5), ('chocolate', 8),
               ('chocolate', 8), ('banana nut', 10), ('vanilla', 4.1),
               ('chocolate', 10), ('huckleberry', 10), ('vanilla', 10)]
    flavors_to_report_on = ['chocolate', 'banana nut', 'vanilla']
    for flavor in flavors_to_report_on:
        new_ratings = ratings_for_flavor(ratings, flavor)
        print_info(new_ratings, flavor)


if __name__ == '__main__':
    main()

If you need help with the ratings_to_flavor() function, look at filter_to_type() in the guide on lists of tuples.

The list of ratings is coded into the program, so the output should be:

The average score for chocolate is 9.0.
The average score for banana nut is 8.9.
The average score for vanilla is 7.5.

Discussion with TA:

• What pattern do these two function use?
• How did you compute the average?

More ice cream

15 minutes

This is the same program as above, except the person running the program can enter all of the ice cream ratings, in addition to which flavors should be included in the report.

You need to write two functions:

• The get_ratings() function should return a list of tuples (flavor, score) , as input by the user.
• The get_flavors() function should return a list of flavors, like ['chocolate', 'banana nut', 'vanilla']

You have starter code in more_ice_cream.py:

def print_info(ratings, flavor):
    average = get_average(ratings)
    print(f"The average score for {flavor} is {average}.")


def get_ratings():
    # Write code here
    pass


def get_flavors():
    # Write code here
    pass


def main():
    ratings = get_ratings()
    flavors = get_flavors()
    for flavor in flavors:
        new_ratings = ratings_for_flavor(ratings, flavor)
        print_info(new_ratings, flavor)


if __name__ == '__main__':
    main()

You should be able to copy your functions for ratings_for_flavor() and get_average() from the previous problem.

To get the ratings, remember to use score = float(score) to convert a string score like '9.5' into a float 9.5. You can see examples of how to get the ratings in the guide on tuples. Getting the flavors is just getting a list of strings.

Your output should look something like this:

Enter all the ice cream ratings. Enter an empty flavor to end.
Enter a flavor: chocolate
Enter a score: 10
Enter a flavor: banana nut
Enter a score: 7.3
Enter a flavor: chocolate
Enter a score: 8
Enter a flavor: banana nut
Enter a score: 9.1
Enter a flavor: chocolate
Enter a score: 9.9
Enter a flavor: banana nut
Enter a score: 8.6
Enter a flavor:

Enter flavors to get info on, ending with a blank line.
Flavor: chocolate
Flavor: banana nut
Flavor:

The average score for chocolate is 9.3.
The average score for banana nut is 8.3.

Discussion with TA:

• Did you use a helper function for get_flavors()?
• Did you use None?
• How comfortable are you with tuples and lists of tuples?