Functions calling other functions
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. Which code shows a function calling another function?
2. A program has a helper function called get_name(). Which is the best job for that function?
3. True or false: one function can call another function inside its body.
4. In a decomposition, a problem is split into boxes: 'Get score', 'Add bonus', 'Show result'. How do these boxes match Python code?
5. Which main() runs the helper functions in a sensible order?
B
Match the Pairs
Draw a line connecting each item on the left to its match on the right.
| Left column | Right column | |
|---|---|---|
| 1def main(): greet() | Adef main(): get_name() show_menu() | |
| 2def area(w, h): return w * h | Bgreet is missing its brackets, so the helper function is never called. It should be greet(). | |
| 3A decomposition box called 'Show the score' becomes its own function that main() can call | CThe main function calls the greet function, so main uses greet as a helper to do one job | |
| 4A big problem is split up so main() calls one small helper function for each sub-problem | Dshow_score() is called but was never defined with def, so Python gives a NameError. Define the helper first. | |
| 5def main(): greet main() | EA small helper function that does just one job: work out an area and give it back | |
| 6def main(): show_score() main() | Fdef show_score(score): print(score) |
C
Definitions
def main(): greet()
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
def cheer(): print("Go!")
def ____(): cheer()
2.
___ main():
greet()
goodbye()
3.
def show(n): _____(n * n)
def main(): show(5)
4.
def add(a, b): return a _ b
def main(): print(add(2, 3))
main()
5.
def area(w, h): return w * h
def main(): print(____(3, 4))
E
Spot the Error
Shade in the letter of the line that contains an error.
Question 1
A
def square(n):
B
return n * n
C
def sum_squares(a, b)
D
return square(a) + square(b)
E
print(sum_squares(2, 3))
Question 2
A
def get_name():
B
return "Sam"
C
def welcome():
D
name = get_name
E
print("Hi " + name)
F
welcome()
Question 3
A
define add_tax(price):
B
return price * 1.1
C
def total(price):
D
return add_tax(price)
E
print(total(10))
Question 4
A
def show_line():
B
print("-" * 10
C
def show_title():
D
show_line()
E
print("Quiz")
Question 5
A
def say_hi:
B
print("Hi!")
C
def main():
D
say_hi()
E
main()
Answer Key
Functions calling other functions
Section A: Quick Questions
Q1
B — def main():
greet()
Q2
A — Only ask the user for their name
Q3
A — True
Q4
A — Each box becomes its own function
Q5
B — def main():
get_score()
show_result()
Section B: Match the Pairs
Q1
def main():
greet() → The main function calls the greet function, so main uses greet as a helper to do one job
Q2
def area(w, h):
return w * h → A small helper function that does just one job: work out an area and give it back
Q3
A decomposition box called 'Show the score' becomes its own function that main() can call → def show_score(score):
print(score)
Q4
A big problem is split up so main() calls one small helper function for each sub-problem → def main():
get_name()
show_menu()
Q5
def main():
greet
main() → greet is missing its brackets, so the helper function is never called. It should be greet().
Q6
def main():
show_score()
main() → show_score() is called but was never defined with def, so Python gives a NameError. Define the helper first.
Section C: Definitions
Q1
def main(): greet() — A function can call another function inside its body. Big problems get split into small helper functions that each do one job, like boxes in a decomposition.Section D: Fill in the Blanks
Q1
def cheer(): print("Go!")
def main(): cheer()Q2
def main():
greet()
goodbye()Q3
def show(n): print(n * n)
def main(): show(5)Q4
def add(a, b): return a + b
def main(): print(add(2, 3))
main()Q5
def area(w, h): return w * h
def main(): print(area(3, 4))Section E: Spot the Error
Q1
C — A function definition must end with a colon. It should be def sum_squares(a, b):
Q2
D — To call a helper function you need brackets. Without them, name just stores the function itself. It should be name = get_name().
Q3
A — Python uses the keyword def, not define, to create a function. It should be def add_tax(price):
Q4
B — The print( bracket is never closed. It should be print("-" * 10).
Q5
A — A function definition needs brackets after its name, even with no parameters. It should be def say_hi():