Super function usage in Python - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to call the parent class method using super().

Python

class Parent:
    def greet(self):
        print("Hello from Parent")

class Child(Parent):
    def greet(self):
        [1]().greet()
        print("Hello from Child")

c = Child()
c.greet()

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

Asuper

BParent

CChild

Dself

Attempts:

3 left

💡 Hint

Common Mistakes

Using the child class name instead of super()

Calling the method without super()

Using self instead of super()

The super() function is used to call a method from the parent class.

2fill in blank

medium

Complete the code to properly initialize the parent class using super().

Python

class Animal:
    def __init__(self, name):
        self.name = name

class Dog(Animal):
    def __init__(self, name, breed):
        [1]().__init__(name)
        self.breed = breed

d = Dog("Buddy", "Golden Retriever")
print(d.name, d.breed)

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

ADog

BAnimal

Cself

Dsuper

Attempts:

3 left

💡 Hint

Common Mistakes

Calling Animal.__init__ directly instead of using super()

Forgetting to call the parent __init__

Using self.__init__ instead of super().__init__

Use super().__init__(name) to call the parent class constructor.

3fill in blank

hard

Fix the error in the code by completing the super() call correctly.

Python

class Base:
    def show(self):
        print("Base show")

class Derived(Base):
    def show(self):
        [1].show(self)
        print("Derived show")

d = Derived()
d.show()

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

ADerived

Bsuper

CBase

Dsuper()

Attempts:

3 left

💡 Hint

Common Mistakes

Using super() with parentheses but passing self explicitly

Calling Base.show(self) directly

Using Derived.show(self) causing recursion

When calling a method with explicit self, use super.show(self) without parentheses after super.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that uses super() to call a method and filter keys.

Python

class A:
    def get_value(self, x):
        return x * 2

class B(A):
    def get_value(self, x):
        return super().get_value(x) + 1

b = B()
result = {k: b.[1](k) for k in range(5) if k [2] 2}
print(result)

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

Aget_value

B>

C<

Dvalue

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong method name

Using wrong comparison operator

Using a non-existent method

The method get_value is called on b, and keys greater than 2 are included.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that calls a super method, uses keys as uppercase strings, and filters values.

Python

class Parent:
    def process(self, val):
        return val * 3

class Child(Parent):
    def process(self, val):
        return super().process(val) + 2

c = Child()
result = [1]: c.[2](v) for v in range(6) if v [3] 3}
print(result)

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

Astr(v).upper()

Bprocess

C<

Dv

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong key format

Using wrong method name

Using wrong comparison operator

The keys are uppercase strings of v, the method process is called on c, and values less than 3 are included.

Practice

1. What is the main purpose of using super() in a child class?

easy

A. To call a method from the parent class

B. To create a new instance of the child class

C. To delete the parent class

D. To override the child class method completely

Solution

1. Step 1: Understand what super() does

   super() is used to access methods from the parent class inside a child class.

2. Step 2: Identify the correct purpose

   Calling a parent class method helps reuse code and extend functionality.

3. Final Answer:

   To call a method from the parent class -> Option A

4. Quick Check:

   super() calls parent method = A [OK]

Hint: Remember: super() means 'call parent method' [OK]

Common Mistakes:

• Thinking super() creates new objects
• Believing super() deletes classes
• Assuming super() overrides child methods fully

2. Which of the following is the correct syntax to call a parent class method greet inside a child class method using super()?

easy

A. super().greet()

B. super->greet()

C. super[greet]()

D. super.greet()

Solution

1. Step 1: Recall the syntax of super()

   The correct way to call a parent method is using super() followed by dot and method name.

2. Step 2: Match the correct option

   Only super().greet() uses the right parentheses and dot notation.

3. Final Answer:

   super().greet() -> Option A

4. Quick Check:

   Use parentheses with super() = D [OK]

Hint: super() always needs parentheses before method call [OK]

Common Mistakes:

• Omitting parentheses after super
• Using square brackets instead of parentheses
• Using arrow notation which is invalid in Python

3. What will be the output of this code?

class Parent:
    def greet(self):
        return "Hello from Parent"

class Child(Parent):
    def greet(self):
        return super().greet() + " and Child"

c = Child()
print(c.greet())

medium

A. Hello from Parent

B. Hello from Child

C. Hello from Parent and Child

D. Error: super() not used correctly

Solution

1. Step 1: Understand method calls in Child.greet()

   Child's greet calls super().greet() which runs Parent's greet returning Hello from Parent.

2. Step 2: Combine returned strings

   Child's greet adds and Child to the parent's string, so final output is Hello from Parent and Child.

3. Final Answer:

   Hello from Parent and Child -> Option C

4. Quick Check:

   super() calls parent method + extra text = A [OK]

Hint: super() returns parent result; child can add more [OK]

Common Mistakes:

• Expecting only parent's message without child addition
• Thinking super() causes error here
• Ignoring the string concatenation

4. Find the error in this code using super():

class Base:
    def show(self):
        print("Base show")

class Derived(Base):
    def show(self):
        super.show()
        print("Derived show")

d = Derived()
d.show()

medium

A. Derived class should not override show()

B. Base class method show() is missing

C. print statements are incorrect

D. super.show() should be super().show()

Solution

1. Step 1: Identify how super() is called

   The code uses super.show() which is invalid syntax; super must be called as a function.

2. Step 2: Correct the syntax

   It should be super().show() to properly call the parent method.

3. Final Answer:

   super.show() should be super().show() -> Option D

4. Quick Check:

   super() needs parentheses before method = C [OK]

Hint: Always use super() with parentheses before method call [OK]

Common Mistakes:

• Calling super without parentheses
• Thinking parent method is missing
• Believing overriding is not allowed

5. You want to extend a parent class __init__ method to add a new attribute in the child class. Which code correctly uses super() to do this?

class Animal:
    def __init__(self, name):
        self.name = name

class Dog(Animal):
    def __init__(self, name, breed):
        ???
        self.breed = breed

Choose the correct replacement for ???.

hard

A. super(Dog, self).__init__(breed)

B. super().__init__(name)

C. Animal.__init__(self, breed)

D. super().__init__(breed)

Solution

1. Step 1: Understand parent __init__ parameters

   Animal's __init__ takes name, so we must pass name to it.

2. Step 2: Use super() correctly in child __init__

   Calling super().__init__(name) runs Animal's __init__ properly, then child adds breed.

3. Final Answer:

   super().__init__(name) -> Option B

4. Quick Check:

   super() calls parent with correct args = B [OK]

Hint: Pass parent's expected args to super().__init__() [OK]

Common Mistakes:

• Passing wrong argument to super()
• Calling parent __init__ without self
• Using old super() syntax incorrectly