Lists

Question 1

What are values inside a list called?

Answer 1

Elements

Question 1

Rather than creating a variable for each new piece of data, we can collect related data inside a list using…

Answer 1

[ ] brackets

Question 2

What’s the symbol for separating values in a list?

Answer 2

A comma ,

Question 3

How many values can we store in a list?

Answer 3

As many as we’d like

Question 4

Every element in a list has a numbered position called…

Answer 4

An Index

Question 5

If there are four elements in a list, what is the number of the last index?

Answer 5

3 (because indices start from 0)

Question 6

What do we call the position of an element in a list?

Answer 6

The element’s index

Question 7

How do we update a value in a list?

Answer 7

We access the value by its index, then assign another value.

Question 8

Which indices can we access in a list with two elements?

Answer 8

0 and 1

Question 9

How do you add a value to the end of a list?

Answer 9

With append()

scores = [24, 23]
scores=.append(25)
print(scores)

[23, 24, 25]

Question 10

Where does the added value appear when using .append()?

Answer 10

At the end of the list

Question 11

How do we add a value to a specific index?

Answer 11

Use insert()

shopping = [“kiwis”, “peas”]
shopping.insert(0, lemon)
print(shopping)

[lemon, kiwis, peas]

Question 12

What are the two parameters of a insert() function?

Answer 12

1. The index where we want to insert the value
2. The value to insert

Question 13

When using append() or insert() how many elements can we add to a list?

Answer 13

One at a time

Question 14

How can we remove the last element in a list?

Answer 14

Use pop() as printed here

Question 15

How can we remove an element at a specific index?

Answer 15

Use pop() with the index between the ()

Question 16

What two instructions can add values to a list?

Answer 16

.append()
.insert()

Question 17

How can we save the value removed by .pop()?

Answer 17

By storing it in a variable

gifts = [“earrings”, “chocolates”]
removed = gifts.pop()
print(removed)

Question 18

What’s an easy way to loop through all elements of a list?

Answer 18

Using a for loop

Question 19

What is the configuration of a for loop?

Answer 19

The word “for”
A variable of our choice
The word “in”
Then the list name

Question 20

Where is the variable in this for loop?

for artist in artists

Answer 20

The variable before in holds the value of the list element the loop is currently on.

Artist

Question 21

How do we get the number of elements in a list?

Answer 21

By using the len() instruction.

users = [“Sarah”, “Mike”, “Ella”]

print(len(users))

Question 22

What instruction do we use to get the number of elements in a list?

Answer 22

len()

Question 23

How do you use the code max()?

Answer 23

To find the largest number in a list of data, code max() with the name of the list between the parentheses.

Question 24

How do you use the code min()?

Answer 24

To find the smallest number in a list of data, code min() with the name of the list between the parentheses

Question 25

How do you use the code sort()?

Answer 25

To sort a list, we code the list name, a dot . , and then sort()

Question 26

What does sort() do when applied on a list of numbers?

Answer 26

It sorts the numbers in ascending order.

Question 27

What happens when we sort a list containing both float and integer values?

Answer 27

The list elements are sorted according to their numeric value.

Question 28

How does sort() sort a list of strings?

Answer 28

In alphabetical order.

Question 29

How do we use the sum() function?

Answer 29

To calculate the total of a list, we use sum() with the list name between the parentheses, like sum(signups).

Question 30

What does sum() do when used on a list of numbers?

Answer 30

It sums up the numbers in the list.

Question 31

What happens when we use sum() on a list that contains negative numbers?

Answer 31

We'll get the sum of the positive numbers, minus that of the negative.

Question 32

How can we reuse the result of sum()?

Answer 32

We save the result in a variable.

Question 33

What does the + operator do when used on two lists?

Answer 33

It joins the two lists elements into a new list.

Question 34

When coding list_1 + list_2 in which order will the elements appear in the new list?

Answer 34

The elements of list_1 will appear first then those of list_2

Question 35

What types of values can the lists we combine have?

Answer 35

Any type

Question 36

How can we reuse the list we get from joining two lists?

Answer 36

We save it in a variable

Question 37

How do we count how often a value appears in a list?

Answer 37

By using count()

Question 38

How is the count() action configured?

Answer 38

We start with the team name, a dot . , and then count(). Place the element in the parentheses that we are counting.

Question 39

What keyword can we use to learn if an element is present in a list?

Answer 39

We use the in keyword. ingredients = ["flour", butter", "sugar", "eggs"] print("sugar" in ingredients) True

Question 40

What type is created when using the in keyword?

Answer 40

A Boolean (True or False)

Question 41

What does count() do when given a value?

Answer 41

It tells us how often that value appears in a list

Question 42

Where do we code the element that we want to count in a list?

Answer 42

Between the parentheses of .count()

Question 43

What can we use the in keyword for?

Answer 43

Checking if a list contains an element