print() inside a function versus return
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. A function has print(a + b) as its last line and no return. What does result = add(2, 3) store in result?
2. Which function lets you store its answer in a variable and use it later?
3. What does total = add(2, 3) + 10 do if add() only prints a + b and has no return?
4. Which line puts the result of square(4) into a variable named answer?
5. True or false: print() inside a function sends the value back to the line that called it.
B
Match the Pairs
Draw a line connecting each item on the left to its match on the right.
| Left column | Right column | |
|---|---|---|
| 1def add(a, b): return a + b | Aage is stored as None because get_age() prints 13 but does not return it. Use return 13 instead. | |
| 2def add(a, b): print(a + b) | Btotal = add(2, 3) | |
| 3Storing the result of a function that returns a value in a variable | COnly shows the sum on screen, and the function gives back None | |
| 4Using a returned result inside a calculation | Dsquare() only prints and gives back None, so adding 1 to None causes a TypeError. Use return n * n instead of print(n * n). | |
| 5def square(n): print(n * n) answer = square(4) + 1 | Edouble = add(2, 3) * 2 | |
| 6def get_age(): print(13) age = get_age() | FHands the sum back to the caller so it can be stored or used in a calculation |
C
Definitions
return
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
def total(a, b):
______ a + b
print(total(2, 3))
2.
def hi():
print("Hi")
print(hi() == ____)
3.
def cube(n):
return n ** 3
volume = ____(3)
4.
def double(n):
______ n * 2
print(double(4) + 1)
5.
def greet():
_____("Hello!")
greet()
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
total = add(2, 3)
D
print(total)
Question 2
A
def to_f(c):
B
print(c * 9 / 5 + 32)
C
warm = to_f(25) > 70
D
print(warm)
Question 3
A
def add_bonus(n):
B
return n + 5
C
add_bonus(10)
D
print(score)
Question 4
A
def cube(n):
B
return n * n * n
C
x = cube(3)
D
return x
Question 5
A
def add(a):
B
return a + b
C
total = add(4, 6)
D
print(total)
Answer Key
print() inside a function versus return
Section A: Quick Questions
Q1
A — None
Q2
B — def double(n):
return n * 2
Q3
B — It causes a TypeError, because None + 10 is not allowed
Q4
A — answer = square(4)
Q5
A — False
Section B: Match the Pairs
Q1
def add(a, b):
return a + b → Hands the sum back to the caller so it can be stored or used in a calculation
Q2
def add(a, b):
print(a + b) → Only shows the sum on screen, and the function gives back None
Q3
Storing the result of a function that returns a value in a variable → total = add(2, 3)
Q4
Using a returned result inside a calculation → double = add(2, 3) * 2
Q5
def square(n):
print(n * n)
answer = square(4) + 1 → square() only prints and gives back None, so adding 1 to None causes a TypeError. Use return n * n instead of print(n * n).
Q6
def get_age():
print(13)
age = get_age() → age is stored as None because get_age() prints 13 but does not return it. Use return 13 instead.
Section C: Definitions
Q1
return — Hands a value back to the caller so it can be stored in a variable or used in a calculation. print() inside a function only shows the value on screen, and the function then gives back None.Section D: Fill in the Blanks
Q1
def total(a, b):
return a + b
print(total(2, 3))Q2
def hi():
print("Hi")
print(hi() == None)Q3
def cube(n):
return n ** 3
volume = cube(3)Q4
def double(n):
return n * 2
print(double(4) + 1)Q5
def greet():
print("Hello!")
greet()Section E: Spot the Error
Q1
B — print() only shows the sum on screen and the function then gives back None. So total holds None, not 5. The line should be 'return a + b' so the value is handed back and can be stored.
Q2
B — print() shows the temperature but the function returns None. Comparing None > 70 causes a TypeError. Use 'return c * 9 / 5 + 32' so the result can be used in the comparison.
Q3
C — The returned value is thrown away because it is not stored in a variable. So score is never created and print(score) gives a NameError. It should be 'score = add_bonus(10)'.
Q4
D — return can only be used inside a function. Outside one it causes a SyntaxError. To show the value on screen at the main level, use print(x).
Q5
A — The function body uses b, but b is not listed as a parameter, so the call add(4, 6) fails. The line should be 'def add(a, b):' so both values can be passed in and the sum returned.