A function that returns True or False inside an if
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. Which function body correctly checks if a number is even and returns a bool?
2. Which if line calls a yes/no function directly in the condition?
3. What does is_even(8) give back?
4. Which name is best for a function that answers a yes/no question about a number?
5. n is 7. What happens with this code?
if is_even(n):
print('Even')
B
Match the Pairs
Draw a line connecting each item on the left to its match on the right.
| Left column | Right column | |
|---|---|---|
| 1return n % 2 == 0 | ACalls the function inside the if condition; the indented code runs only when it returns True | |
| 2if is_even(n): | BThe brackets and argument are missing, so the function is not called. is_even is just the function itself, not its True/False answer. | |
| 3A function that returns a bool can be called directly in an if condition, with no extra variable | CThe function prints the result instead of returning it, so it gives back None and the if never sees True. | |
| 4A good name for a yes/no function starts with is_ so the if line reads like a question | DGives back True when n is even and False when it is odd, so the function can be used as a yes/no check | |
| 5if is_even == True: print("Even") | Eif is_adult(age): print("Welcome") | |
| 6def is_even(n): print(n % 2 == 0) | Fdef is_even(n): return n % 2 == 0 |
C
Definitions
if is_even(n):
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
___ is_even(n):
return n % 2 == 0
2.
if _______(n):
print("n is even")
3.
__ is_even(n):
print("Even")
4.
while ___ is_even(n):
n = n + 1
5.
age = 20
if ________(age):
print("Welcome")
E
Spot the Error
Shade in the letter of the line that contains an error.
Question 1
A
def is_even(n)
B
return n % 2 == 0
C
num = 8
D
if is_even(num):
E
print("Even")
Question 2
A
def is_even(n):
B
return n % 2 == 0
C
n = 6
D
if is_even[n]:
E
print("Even")
Question 3
A
def is_adult(age):
B
return age >= 18
C
if is_adult:
D
print("Adult")
Question 4
A
def is_even(n):
B
result = n % 2 == 0
C
print(result)
D
if is_even(10):
E
print("Even")
Question 5
A
def is_even(n):
B
return n % 2 = 0
C
for i in range(1, 5):
D
if is_even(i):
E
print(i)
Answer Key
A function that returns True or False inside an if
Section A: Quick Questions
Q1
A — def is_even(n):
return n % 2 == 0
Q2
A — if is_even(n):
Q3
A — True
Q4
B — is_even
Q5
B — Nothing is printed
Section B: Match the Pairs
Q1
return n % 2 == 0 → Gives back True when n is even and False when it is odd, so the function can be used as a yes/no check
Q2
if is_even(n): → Calls the function inside the if condition; the indented code runs only when it returns True
Q3
A function that returns a bool can be called directly in an if condition, with no extra variable → if is_adult(age):
print("Welcome")
Q4
A good name for a yes/no function starts with is_ so the if line reads like a question → def is_even(n):
return n % 2 == 0
Q5
if is_even == True:
print("Even") → The brackets and argument are missing, so the function is not called. is_even is just the function itself, not its True/False answer.
Q6
def is_even(n):
print(n % 2 == 0) → The function prints the result instead of returning it, so it gives back None and the if never sees True.
Section C: Definitions
Q1
if is_even(n): — Calls a function that returns True or False right inside an if condition. The indented code runs only when the function returns True, so no extra variable is needed.Section D: Fill in the Blanks
Q1
def is_even(n):
return n % 2 == 0Q2
if is_even(n):
print("n is even")Q3
if is_even(n):
print("Even")Q4
while not is_even(n):
n = n + 1Q5
age = 20
if is_adult(age):
print("Welcome")Section E: Spot the Error
Q1
A — A function definition line must end with a colon. It should be def is_even(n):
Q2
D — A function is called with round brackets, not square brackets. It should be if is_even(n):
Q3
C — The function is never called because the brackets and the argument are missing. It should be if is_adult(20):
Q4
C — The function prints the answer but gives nothing back, so the if gets None and never runs. It should be return result.
Q5
B — A single = assigns a value. To compare, use ==. It should be return n % 2 == 0