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Answers: Functions

Answers: Functions#

Provided here are answers to the practice questions at the end of “Functions”.

Function Execution#

Function Execution Q1#

tempA = convert_temp(95)
tempB = convert_temp(17, 'C')

Function Execution Q2#

comp_a = compare_to_threshold(250)
comp_b = compare_to_threshold(42, 42)
comp_c = compare_to_threshold(value=3, threshold=7)

User-Designed Functions#

UDFs Q1#

# there are multiple approaches to string concatenation
def provide_info(name, year, school='UCSD'):
    output = "Hi! I'm " + name + '. I am a ' + year + ' at ' + school + '.'
    return output

UDFs Q2#

# there are multiple approaches that work
def change_username(username):
    if len(username) > 4 and username.isalnum() and 'cogs' not in username:
        return False
    else:
        return True

UDFs Q3#

def exclaim(str_a, str_b):
    result = str_a + ' ' + str_b + '!'
    return result

exclaim('Happy', 'Friday')

UDFs Q4#

def return_bigger(num1, num2):
    if num1 > num2:
        return num1
    elif num2 > num1:
        return num2
    elif num2 == num1:
        return num1

UDFs Q5#

# wording of the returned messages may vary
def buy_or_save(round_1, round_2):
    if round_1 == 'W' and round_2 == 'W':
        return 'The team should save!'
    elif round_1 == 'L' and round_2 == 'L':
        return 'The team should buy!'
    else:
        return 'The team should half-buy!'

UDFs Q6#

def matcha(color, texture):
    if color == "vibrant green" and texture == "fine":
        return "This is ceremonial-grade matcha!" # wording may vary
    elif color == "dull green" and texture == "fine":
        return "This is high-grade matcha!" # wording may vary
    else:
        return "This is low-grade matcha!" # wording may vary

UDFs Q7#

# note: the type check must come first;
# otherwise comparing a string to 0 would raise a TypeError
def phone_time(screen_time):
    if type(screen_time) == str or screen_time < 0:
        return 'Invalid input' # message may vary
    elif screen_time < 3:
        return 'Good job keeping your screen time low!' # message may vary
    elif screen_time >= 4:
        return 'Time to take a break from your phone!' # message may vary

UDFs Q8#

def tip_calculator(bill, service='good'):

    if service == 'great':
        tip = bill * 20 / 100
    elif service == 'good':
        tip = bill * 15 / 100
    else:
        tip = bill * 10 / 100

    return tip

UDFs Q9#

def weekend_check(day):
    if day == 'Saturday' or day == 'Sunday':
        return True
    else:
        return False

Debugging#

Debugging Q1#

def growth_rate(this_year, last_year):
    return ((this_year - last_year)/last_year) * 100

Debugging Q2#

# three fixes were needed: a colon at the end of the def statement,
# the indentation of the kelvin line,
# and parentheses around (temp_f - 32) so the subtraction happens first
def fahrenheit_to_kelvin(temp_f):
    temp_c = (temp_f - 32) * 5/9
    kelvin = temp_c + 273.15
    return kelvin

Debugging Q3#

def safe_convert(value):

    try:
        output = int(value)
    except (ValueError, TypeError):
        output = None

    return output
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