Functions – Return Values
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. What does return do?
2. def add(a, b):\n return a + b\nresult = add(3, 5)\nWhat is result?
3. What's the difference between return and print?
4. What does a function return if there's no return statement?
5. def double(n):\n return n * 2\nprint(double(5))\nWhat prints?
B
Match the Pairs
Draw a line connecting each item on the left to its match on the right.
| Left column | Right column | |
|---|---|---|
| 1def double(n): return n * 2 print('done') | AOutput: 8 | |
| 2def greet(): print('Hi') result = greet() print(result + '!') | BError: greet() returns None | |
| 3def double(n): return n * 2 result = double(5) | CError: Code after return unreachable | |
| 4def is_even(n): return n % 2 == 0 | DValid: result stores 10 | |
| 5def double(n): return n * 2 print(double(4)) | EOutput: Hello None | |
| 6def hi(): print('Hello') print(hi()) | FOk: Returns True or False |
C
Definitions
return
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
def add(a, b):
______ a + b
result = add(3, 5)
2.
def double(n):
return n * 2
print(______(5))
3.
def square(n):
return n __ 2
4.
def greet(name):
______ 'Hello ' + name
msg = greet('Al')
5.
def is_even(n):
return n % 2 __ 0
E
Spot the Error
Shade in the letter of the line that contains an error.
Question 1
A
def add(a, b):
B
print(a + b)
C
D
result = add(3, 5)
E
print(result)
Question 2
A
def double(n):
B
result = n * 2
C
return result
D
print('Done')
E
print(double(5))
Question 3
A
def add(a, b):
B
total = a + b
C
return total
D
print('Adding...')
E
print(add(3, 5))
Question 4
A
def add(a, b):
B
total = a + b
C
Return total
D
print('Adding...')
E
print(add(3, 5))
Question 5
A
def double(n):
B
result = n * 2
C
return(result)
D
print('Done')
E
print(double(5))
Answer Key
Functions – Return Values
Section A: Quick Questions
Q1
B — Sends a value back to the caller
Q2
A — 8
Q3
A — return sends data back, print only displays
Q4
A — None
Q5
B — 10
Section B: Match the Pairs
Q1
def double(n):
return n * 2
print('done') → Error: Code after return unreachable
Q2
def greet():
print('Hi')
result = greet()
print(result + '!') → Error: greet() returns None
Q3
def double(n):
return n * 2
result = double(5) → Valid: result stores 10
Q4
def is_even(n):
return n % 2 == 0 → Ok: Returns True or False
Q5
def double(n):
return n * 2
print(double(4)) → Output: 8
Q6
def hi():
print('Hello')
print(hi()) → Output: Hello
None
Section C: Definitions
Q1
return — Sends a value back to the code that called the function.~~Return valueSection D: Fill in the Blanks
Q1
def add(a, b):
return a + b
result = add(3, 5)Q2
def double(n):
return n * 2
print(double(5))Q3
def square(n):
return n ** 2Q4
def greet(name):
return 'Hello ' + name
msg = greet('Al')Q5
def is_even(n):
return n % 2 == 0Section E: Spot the Error
Q1
B — Using print instead of return: result will be None because print doesn't send back a value
Q2
D — Code after return never runs: move print before return
Q3
C — return must be indented inside the function
Q4
C — return must be lowercase: Return is not valid Python
Q5
C — return is a keyword, not a function: parentheses are unnecessary (but this technically works)