Functions – Default Arguments
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. What is a default argument?
2. def greet(name='World'):\n print('Hi ' + name)\ngreet()\nWhat prints?
3. def greet(name='World'):\n print('Hi ' + name)\ngreet('Alice')\nWhat prints?
4. Where must default parameters go?
5. def power(base, exp=2):\n return base ** exp\npower(3)\nWhat returns?
B
Match the Pairs
Draw a line connecting each item on the left to its match on the right.
| Left column | Right column | |
|---|---|---|
| 1def greet(greeting='Hi', name): pass | AError: Missing required 'base' | |
| 2def power(base, exp=2): return base ** exp power(exp=3) | BError: Default args must come last | |
| 3def greet(name='World'): print('Hi ' + name) | COutput: Hi World | |
| 4def power(n, exp=2): return n ** exp | DOutput: Hi Alice | |
| 5def hi(name='World'): print('Hi', name) hi() | EOk: exp defaults to 2 | |
| 6def hi(name='World'): print('Hi', name) hi('Alice') | FValid: name is optional |
C
Definitions
Default argument
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
def greet(name=_______):
print('Hi ' + name)
2.
def power(base, exp=_):
return base ** exp
3.
def repeat(msg, _____=3):
for i in range(times):
print(msg)
4.
def greet(name='World'):
print('Hi ' + name)
greet(_______)
5.
def func(a, b=5, _=10):
return a + b + c
E
Spot the Error
Shade in the letter of the line that contains an error.
Question 1
A
def greet(name='World', msg):
B
full = msg + ' ' + name
C
print(full)
D
return full
E
greet('Hi')
Question 2
A
def greet(name=World):
B
msg = 'Hi ' + name
C
print(msg)
D
return msg
E
greet()
Question 3
A
def power(base, exp: 2):
B
result = base ** exp
C
print('Result:', result)
D
return result
E
power(3)
Question 4
A
def greet(name = 'World'):
B
msg = 'Hi ' + name
C
print(msg)
D
return msg
E
greet()
Question 5
A
def repeat(msg, times=3):
B
for i in range(times):
C
print(msg)
D
E
repeat(times=2)
Answer Key
Functions – Default Arguments
Section A: Quick Questions
Q1
A — A pre-set value used when no argument is given
Q2
B — Hi World
Q3
A — Hi Alice
Q4
A — After all required parameters
Q5
B — 9
Section B: Match the Pairs
Q1
def greet(greeting='Hi', name):
pass → Error: Default args must come last
Q2
def power(base, exp=2):
return base ** exp
power(exp=3) → Error: Missing required 'base'
Q3
def greet(name='World'):
print('Hi ' + name) → Valid: name is optional
Q4
def power(n, exp=2):
return n ** exp → Ok: exp defaults to 2
Q5
def hi(name='World'):
print('Hi', name)
hi() → Output: Hi World
Q6
def hi(name='World'):
print('Hi', name)
hi('Alice') → Output: Hi Alice
Section C: Definitions
Q1
Default argument — A pre-set value used when no argument is provided.~~Optional parameterSection D: Fill in the Blanks
Q1
def greet(name='World'):
print('Hi ' + name)Q2
def power(base, exp=2):
return base ** expQ3
def repeat(msg, times=3):
for i in range(times):
print(msg)Q4
def greet(name='World'):
print('Hi ' + name)
greet('Alice')Q5
def func(a, b=5, c=10):
return a + b + cSection E: Spot the Error
Q1
A — Default parameters must come AFTER required ones
Q2
A — Default value 'World' needs quotes: it's a string
Q3
A — Use = for default values, not : (colon is for type hints)
Q4
A — Convention: no spaces around = in default parameters (PEP 8 style)
Q5
E — msg is required: you must provide it even when using keyword arguments