Methods with parameters in Python - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a method that takes one parameter and prints it.

Python

class Printer:
    def print_message(self, [1]):
        print(message)

p = Printer()
p.print_message("Hello")

Drag options to blanks, or click blank then click option'

Amessage

Bmsg

Ctext

Dinput

Attempts:

3 left

💡 Hint

Common Mistakes

Using a parameter name different from the variable inside the method causes a NameError.

The method parameter must match the variable used inside the method. Here, message is used, so the parameter should be message.

2fill in blank

medium

Complete the code to call the method with the correct argument.

Python

class Calculator:
    def add(self, number):
        return number + 10

calc = Calculator()
result = calc.add([1])
print(result)

Drag options to blanks, or click blank then click option'

Anumber

B"5"

C5

Dadd

Attempts:

3 left

💡 Hint

Common Mistakes

Passing a string instead of a number causes concatenation or errors.

The method expects a number, so passing the integer 5 is correct. Passing a string "5" would cause unexpected behavior.

3fill in blank

hard

Fix the error in the method definition to correctly accept two parameters.

Python

class Multiplier:
    def multiply(self, [1]):
        return a * b

m = Multiplier()
print(m.multiply(3, 4))

Drag options to blanks, or click blank then click option'

Ax, y

Ba, b

Cself, a, b

Dnum1, num2

Attempts:

3 left

💡 Hint

Common Mistakes

Omitting self causes a TypeError when calling the method.

Methods must have self as the first parameter, which is already included. To accept two numbers, fill the blank with a, b to match the variables used inside the method.

4fill in blank

hard

Fill both blanks to create a method that returns the sum of two parameters.

Python

class Adder:
    def add(self, [1], [2]):
        return x + y

adder = Adder()
print(adder.add(7, 8))

Drag options to blanks, or click blank then click option'

Ax

By

Ca

Db

Attempts:

3 left

💡 Hint

Common Mistakes

Using parameter names different from the variables in the return statement causes NameError.

The method parameters must match the variables used in the return statement. Here, x and y are used, so the parameters should be x and y.

5fill in blank

hard

Fill all three blanks to create a method that returns a formatted string using its parameters.

Python

class Greeter:
    def greet(self, [1], [2]):
        return f"Hello, [3] [2]!"

g = Greeter()
print(g.greet("Dr.", "Smith"))

Drag options to blanks, or click blank then click option'

Atitle

Bname

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up parameter names or placeholders causes NameError or wrong output.

The method parameters are title and name. The formatted string uses title and name. The third blank is the first part inside the string, which is title.

Practice

1. What is the purpose of parameters in a Python method?

easy

A. To accept inputs that the method can use

B. To store data permanently

C. To print output automatically

D. To create new variables outside the method

Solution

1. Step 1: Understand what parameters do

   Parameters allow a method to receive inputs when it is called.

2. Step 2: Identify the correct purpose

   Parameters are not for storing data permanently or printing output; they are for input.

3. Final Answer:

   To accept inputs that the method can use -> Option A

4. Quick Check:

   Parameters = inputs [OK]

Hint: Parameters let methods take inputs to work with [OK]

Common Mistakes:

• Thinking parameters store data permanently
• Confusing parameters with output
• Believing parameters create variables outside method

2. Which of the following is the correct way to define a method with two parameters a and b in Python?

easy

A. def my_method{a, b}:

B. def my_method[a, b]:

C. def my_method(a, b):

D. def my_method a, b:

Solution

1. Step 1: Recall Python method syntax

   Methods use parentheses () to list parameters separated by commas.

2. Step 2: Identify correct syntax

   Only def my_method(a, b): uses parentheses and commas correctly.

3. Final Answer:

   def my_method(a, b): -> Option C

4. Quick Check:

   Method parameters use ( ) and commas [OK]

Hint: Use parentheses and commas to list parameters [OK]

Common Mistakes:

• Using square brackets instead of parentheses
• Using curly braces instead of parentheses
• Omitting parentheses around parameters

3. What will be the output of the following code?

def greet(name):
    return f"Hello, {name}!"

print(greet("Alice"))

medium

A. Hello, name!

B. Error: name not defined

C. greet(Alice)

D. Hello, Alice!

Solution

1. Step 1: Understand the method call

   The method greet is called with argument "Alice" passed to parameter name.

2. Step 2: Evaluate the return statement

   The method returns the string "Hello, Alice!" using f-string formatting.

3. Final Answer:

   Hello, Alice! -> Option D

4. Quick Check:

   Method returns greeting with input name [OK]

Hint: Arguments replace parameters when method runs [OK]

Common Mistakes:

• Printing the parameter name instead of its value
• Confusing method name with output
• Expecting an error due to missing quotes

4. Find the error in this method definition:

def add_numbers(x, y)
    return x + y

medium

A. Parameters should be inside square brackets

B. Missing colon after parameter list

C. Return statement should be outside the method

D. Parameters must be strings

Solution

1. Step 1: Check method syntax

   Python method definitions require a colon ':' after the parameter list.

2. Step 2: Identify missing colon

   The code misses the colon after (x, y), causing syntax error.

3. Final Answer:

   Missing colon after parameter list -> Option B

4. Quick Check:

   Method header ends with ':' [OK]

Hint: Always put ':' after method parameters [OK]

Common Mistakes:

• Forgetting colon after parameters
• Using wrong brackets for parameters
• Misplacing return statement

5. You want to create a method calculate_area that takes two parameters width and height and returns their product. Which code correctly implements this?

hard

A. def calculate_area(width, height):
return width * height

B. def calculate_area(width, height):
return width + height

C. def calculate_area(width, height):
print(width * height)

D. def calculate_area(width, height):
return width / height

Solution

1. Step 1: Understand the method goal

   The method should return the product (multiplication) of width and height.

2. Step 2: Check each option's return value

   def calculate_area(width, height): return width * height returns width * height, which is correct. Others return sum, print output, or division.

3. Final Answer:

   def calculate_area(width, height):\n return width * height -> Option A

4. Quick Check:

   Area = width x height [OK]

Hint: Use * operator to multiply parameters for area [OK]

Common Mistakes:

• Using + instead of * for multiplication
• Printing instead of returning value
• Dividing instead of multiplying