Defining a function with def

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Quick Questions

Shade in the A or B circle for each question.

1. Which line correctly starts a function called greet?

A function greet():

B def greet():

2. When does the code inside a function run?

A Only when the function is called

B As soon as Python reads the def line

3. Which function definition is written correctly?

A def hello(): print("Hi!")

B def hello(): print("Hi!")

4. Which def line is correct?

A def say_hi()

B def say_hi():

5. Which order will work without an error?

A Define the function first, then call it

B Call the function first, then define it

Match the Pairs

Draw a line connecting each item on the left to its match on the right.

Left column		Right column
1def greet():		ADefines a function named greet. Its code does not run yet.
2 print("Hi!")		BThe colon is missing at the end of the def line. It should be def greet():
3Define the function first, then call it to make the body run.		Cdef say_hello(): print("Hello")
4A function name is followed by brackets and a colon, and the body is indented.		Ddef cheer(): print("Go!") cheer()
5def greet() print("Hi!")		EThe function is called before it is defined, so Python gives a NameError. Define it first, then call it.
6greet() def greet(): print("Hi!")		FAn indented line inside the function body that runs only when the function is called.

Definitions

def name():

Fill in the Blanks

Complete each line of code by filling in the missing parts.

___ greet(): print("Hi!") greet()

def _____(): print("Hello!") greet()

def welcome()_ print("Welcome!") welcome()

def ______(): print("Hi!") say_hi()

def beep(): _____("Beep!") beep()

Spot the Error

Shade in the letter of the line that contains an error.

Question 1

A def greet():

B print(Hi!)

C greet()

Question 2

A def welcome()

B print("Welcome")

C welcome()

Question 3

A def cheer():

B print("Go team!"

C cheer()

D cheer()

Question 4

A def say_hi():

B Print("Hi")

C say_hi()

Question 5

A def party():

B print("Cake")

C party

Answer Key

Defining a function with def

Section A: Quick Questions

B — def greet():

A — Only when the function is called

A — def hello(): print("Hi!")

B — def say_hi():

A — Define the function first, then call it

Section B: Match the Pairs

def greet(): → Defines a function named greet. Its code does not run yet.

print("Hi!") → An indented line inside the function body that runs only when the function is called.

Define the function first, then call it to make the body run. → def cheer(): print("Go!") cheer()

A function name is followed by brackets and a colon, and the body is indented. → def say_hello(): print("Hello")

def greet() print("Hi!") → The colon is missing at the end of the def line. It should be def greet():

greet() def greet(): print("Hi!") → The function is called before it is defined, so Python gives a NameError. Define it first, then call it.

Section C: Definitions

def name(): — Creates a function: a named, reusable block of indented code that only runs when you call it. Define it first, then call it.

Section D: Fill in the Blanks

def greet():
    print("Hi!")
greet()

def greet():
    print("Hello!")
greet()

def welcome():
    print("Welcome!")
welcome()

def say_hi():
    print("Hi!")
say_hi()

def beep():
    print("Beep!")
beep()

Section E: Spot the Error

B — Text inside print() must be in quote marks. It should be ' print("Hi!")'.

A — A def line must end with a colon. It should be 'def welcome():'.

B — The closing bracket is missing, so the function body has a syntax error. It should be ' print("Go team!")'.

B — Python is case-sensitive. The built-in function is print with a lowercase p, so it should be ' print("Hi")'.

C — Writing the name without brackets does not call the function, so nothing runs. It should be 'party()'.