Passing a list into a function
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. Which function header takes a list called scores as a parameter?
2. Which call correctly passes a list into total_of()?
3. Inside def total_of(scores):, what does scores hold when we call total_of([4, 6])?
4. Which loop lets a function read every item in its list parameter scores?
5. Which statement about calling total_of() is true?
B
Match the Pairs
Draw a line connecting each item on the left to its match on the right.
| Left column | Right column | |
|---|---|---|
| 1def total_of(scores): | ADefines a function with a parameter called scores that will receive a list | |
| 2total_of([5, 8, 9]) | BCalls the function and passes in a list of three numbers | |
| 3The function can loop over every item in the list it was given | CThe call uses a list variable that has not been created, so Python raises a NameError. | |
| 4The same function can be reused with different lists | Dfor s in scores: total += s | |
| 5def total_of([5, 8, 9]): | EA list value was put in the def line. The header needs a parameter name like scores, and the list is passed when calling the function. | |
| 6total_of(scores) # scores was never created | Ftotal_of(maths) total_of(science) |
C
Definitions
def total_of(scores):
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
def total(______):
result = 0
for s in scores:
2.
def total(scores):
return ___(scores)
3.
def total(scores):
result = 0
for score __ scores:
4.
marks = [70, 85, 90]
print(total(_____))
5.
def average(scores):
return sum(scores) / ___(scores)
E
Spot the Error
Shade in the letter of the line that contains an error.
Question 1
A
def total_of(scores)
B
total = 0
C
for s in scores:
D
total += s
E
return total
Question 2
A
def average(marks):
B
total = sum(marks)
C
count = len(marks)
D
return total / marks
E
print(average([70, 80, 90]))
Question 3
A
def biggest(nums):
B
top = nums[0]
C
for n in nums:
D
if n > top
E
top = n
F
return top
Question 4
A
def show_all(names):
B
for name in names:
C
print(nam)
D
show_all(['Ava', 'Liam'])
Question 5
A
def count_pass(marks):
B
passed = 0
C
for m in range(marks):
D
if m >= 50:
E
passed += 1
F
return passed
Answer Key
Passing a list into a function
Section A: Quick Questions
Q1
B — def total_of(scores):
Q2
A — total_of([5, 8, 9])
Q3
B — The list [4, 6]
Q4
A — for score in scores:
Q5
A — You can call it with different lists, such as [5, 8] and [10, 20, 30]
Section B: Match the Pairs
Q1
def total_of(scores): → Defines a function with a parameter called scores that will receive a list
Q2
total_of([5, 8, 9]) → Calls the function and passes in a list of three numbers
Q3
The function can loop over every item in the list it was given → for s in scores:
total += s
Q4
The same function can be reused with different lists → total_of(maths)
total_of(science)
Q5
def total_of([5, 8, 9]): → A list value was put in the def line. The header needs a parameter name like scores, and the list is passed when calling the function.
Q6
total_of(scores)
# scores was never created → The call uses a list variable that has not been created, so Python raises a NameError.
Section C: Definitions
Q1
def total_of(scores): — A function header with a list parameter. Pass a list when you call it, like total_of([5, 8, 9]), and the function can loop over or read its items.Section D: Fill in the Blanks
Q1
def total(scores):
result = 0
for s in scores:Q2
def total(scores):
return sum(scores)Q3
def total(scores):
result = 0
for score in scores:Q4
marks = [70, 85, 90]
print(total(marks))Q5
def average(scores):
return sum(scores) / len(scores)Section E: Spot the Error
Q1
A — A function header must end with a colon. It should be def total_of(scores): so that the indented body belongs to the function.
Q2
D — You can't divide a number by a whole list, which causes a TypeError. Divide by the count of items, so it should be return total / count.
Q3
D — An if statement needs a colon at the end of the line. It should be if n > top: so the indented line below runs when the test is true.
Q4
C — The loop variable is called name, not nam. Using nam causes a NameError. It should be print(name).
Q5
C — range() needs a number, not a list, so this causes a TypeError. To loop over the items in the list parameter, write for m in marks:.