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This quiz was administered in-person. It was closed-book and
closed-note; students were not allowed to use the DSC
10 Reference Sheet. Students had 20 minutes to work on
the quiz.
This quiz covered Lectures 1-4 of the Winter 2024 offering
of DSC 10.
Select all the true statements below.
Mixing ints and floats in an arithmetic
expression will always result in a float.
Dividing two ints will sometimes result in an
int.
Any float can be converted to a string using the
function str().
Any string can be converted to a float using the
function float().
Answer: Option 1 and Option 3
The average score on this problem was 87%.
Consider the assignment statement below.
pear = [6, 10.1, "pear", 13]What does the expression np.array(pear) evaluate to?
array([6, 10.1, "pear", 13])
array([6, 10.1, pear, 13])
array(["6", "10.1", "pear", "13"])
array(["pear"])
array([pear])
This expression errors
Answer:
array(["6", "10.1", "pear", "13"])
The average score on this problem was 50%.
Suppose x and y are both ints
that have been previously defined, with x < y. Now,
define:
peach = np.arange(x, y, 2)Say that the spread of peach is the difference
between the largest and smallest values in peach. The
spread should be a non-negative integer.
Using array methods, write an expression that
evaluates to the spread of peach.
Answer: peach.max() - peach.min()
The average score on this problem was 62%.
Without using any methods or functions, write an
expression that evaluates to the spread of peach.
Hint: Use [ ].
Answer:
peach[len(peach) - 1] - peach[0] or
peach[-1] - peach[0]
The average score on this problem was 36%.
Choose the correct way to fill in the blank in this sentence:
The spread of peach is ______ the
value of y - x.
always less than
sometimes less than and sometimes equal to
always greater than
sometimes greater than and sometimes equal to
always equal to
Answer: always less than
The average score on this problem was 48%.
Suppose fruits is a DataFrame of the fruits Ashley
bought at the grocery store, where:
The "fruit" column contains the name of the fruit,
as a string. All values in this column are distinct.
The "price" column contains the amount in dollars
spent on the fruit, as a float.
The "pounds" column contains the number of
pounds purchased, as an int.
Fill in the blanks below to add a new column to fruits
called "price_per_ounce" that contains the price per ounce
of each of the fruits in fruits. There are 16
ounces in a pound.
fruits = fruits.__(x)__(price_per_ounce = __(y)__ / __(z)__)Answer (x): assign
The average score on this problem was 71%.
Answer (y): fruits.get("price")
The average score on this problem was 67%.
Answer (z):
(fruits.get("pounds") * 16)
The average score on this problem was 43%.
Write a line of code that evaluates to the amount of money, in dollars, that Ashley spent on fruit at the grocery store.
Answer: fruits.get("price").sum() or
sum(fruits.get("price"))
The average score on this problem was 62%.
Fill in the blanks so that the expression below evaluates to the name of the fruit with the highest price per ounce.
(fruits.sort_values(by = "price_per_ounce", ascending = __(x)__)
.get(__(y)__).iloc[0])Answer (x): False
The average score on this problem was 87%.
Answer (y): "fruit"
The average score on this problem was 65%.
Assuming that "mango" is one of the fruits Ashley
bought, fill in the blanks so that the expression below evaluates to the
price per ounce of "mango".
fruits.__(x)__("fruit").get("price_per_ounce").__(y)__["mango"]Answer (x): set_index
The average score on this problem was 41%.
Answer (y): loc
The average score on this problem was 83%.