Adding to a list with append()

Name:

Date:

Class:

Quick Questions

Shade in the A or B circle for each question.

1. Which line adds the number 5 to the end of the list scores?

A scores.append(5)

B scores.add(5)

2. What does pets look like after this code runs? pets = [] pets.append('cat')

A ['cat']

B []

3. Where does append() put the new value?

A At the start of the list

B At the end of the list

4. Which line creates an empty list ready for append()?

A names = ()

B names = []

5. What is the list after this code runs? nums = [1, 2] nums.append(3)

A [1, 2, 3]

B [3, 1, 2]

Match the Pairs

Draw a line connecting each item on the left to its match on the right.

Left column		Right column
1scores = []		Aappend() changes the list itself and gives back None, so assigning the result wipes out the list. It should be just scores.append(10).
2pets.append("cat")		Bfor i in range(5): nums.append(i)
3Use append() inside a loop to build a list of the numbers 0 to 4		Cappend is a method so it needs round brackets (), not square brackets []. It should be fruit.append("apple").
4Ask the user for a name and add it to the end of the names list		DAdds the value "cat" to the end of the pets list, making it one item longer
5fruit = [] fruit.append["apple"]		EStarts with an empty list that has no items yet, ready to be filled with append()
6scores = [] scores = scores.append(10)		Fnames.append(input("Name: "))

Definitions

list.append(value)

Fill in the Blanks

Complete each line of code by filling in the missing parts.

______ = [] scores.append(9)

scores = [] scores.______(10)

scores = [] for i in _____(5): scores.append(i)

scores = [] for i in range(5): scores.append(i _ 2)

scores = [] score = int(input("Score: ")) scores.append(_____)

Spot the Error

Shade in the letter of the line that contains an error.

Question 1

A scores = []

B for i in range(3):

C s = int(input("Score: "))

D scores.add(s)

E print(scores)

Question 2

A names = []

B names.append["Sam"]

C names.append("Mia")

D print(names)

Question 3

A pets = []

B pets.append("cat"

C pets.append("dog")

D print(len(pets))

Question 4

A nums = 0

B for i in range(5):

C nums.append(i)

D print(nums)

Question 5

A totals == []

B for i in range(4):

C totals.append(i * 2)

D print(totals)

Answer Key

Adding to a list with append()

Section A: Quick Questions

A — scores.append(5)

A — ['cat']

B — At the end of the list

B — names = []

A — [1, 2, 3]

Section B: Match the Pairs

scores = [] → Starts with an empty list that has no items yet, ready to be filled with append()

pets.append("cat") → Adds the value "cat" to the end of the pets list, making it one item longer

Use append() inside a loop to build a list of the numbers 0 to 4 → for i in range(5): nums.append(i)

Ask the user for a name and add it to the end of the names list → names.append(input("Name: "))

fruit = [] fruit.append["apple"] → append is a method so it needs round brackets (), not square brackets []. It should be fruit.append("apple").

scores = [] scores = scores.append(10) → append() changes the list itself and gives back None, so assigning the result wipes out the list. It should be just scores.append(10).

Section C: Definitions

list.append(value) — Adds a value to the end of a list, making it one item longer. Start with an empty list like scores = [] and use append() in a loop to build it up.

Section D: Fill in the Blanks

scores = []
scores.append(9)

scores = []
scores.append(10)

scores = []
for i in range(5):
    scores.append(i)

scores = []
for i in range(5):
    scores.append(i * 2)

scores = []
score = int(input("Score: "))
scores.append(score)

Section E: Spot the Error

D — Lists do not have an add() method. To put a value on the end of a list you use append(), so the line should be scores.append(s).

B — append is a method, so the value goes inside round brackets, not square brackets. It should be names.append("Sam").

B — The closing bracket is missing. Every append( needs a matching ). It should be pets.append("cat").

A — nums is set to the number 0, not a list, so nums.append(i) would fail. Start with an empty list: nums = [].

A — A double equals sign compares values. It does not create the list. Use a single equals sign to assign: totals = [].