Method Resolution Order (MRO) in Python - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print the method resolution order of class C.

Python

class A:
    pass

class B:
    pass

class C(A, B):
    pass

print(C.[1]())

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

Amro

Border

Cmethods

Dresolution

Attempts:

3 left

💡 Hint

Common Mistakes

Using a non-existent method like 'order' or 'methods'.

Trying to access an attribute instead of calling a method.

The mro() method returns the method resolution order of a class.

2fill in blank

medium

Complete the code to define class C that inherits from classes A and B.

Python

class A:
    def greet(self):
        print('Hello from A')

class B:
    def greet(self):
        print('Hello from B')

class C([1]):
    pass

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

AA

BB, A

CA, B

DB

Attempts:

3 left

💡 Hint

Common Mistakes

Reversing the order of classes.

Inheriting from only one class instead of both.

Class C inherits from A and B in that order, affecting the method resolution order.

3fill in blank

hard

Fix the error in the code to correctly call the greet method from class C.

Python

class A:
    def greet(self):
        print('Hello from A')

class B:
    def greet(self):
        print('Hello from B')

class C(A, B):
    pass

c = C()
c.[1]()

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

Agreet

Bgreeting

Chello

Dsay_hello

Attempts:

3 left

💡 Hint

Common Mistakes

Using method names that do not exist like 'hello' or 'say_hello'.

Trying to call an attribute instead of a method.

The method to call is greet, which is defined in classes A and B.

4fill in blank

hard

Fill both blanks to create a dictionary showing the MRO of class D and print it.

Python

class X:
    pass

class Y:
    pass

class D([1], [2]):
    pass

print(D.mro())

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

AX

BY

CA

DB

Attempts:

3 left

💡 Hint

Common Mistakes

Using unrelated class names like A or B.

Reversing the order of inheritance.

Class D inherits from X and Y, so the MRO will reflect that order.

5fill in blank

hard

Fill all three blanks to create a class E that inherits from B and C, and print its MRO.

Python

class B:
    pass

class C:
    pass

class E([1], [2]):
    pass

print([3].mro())

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

AB

BC

CE

DD

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong class names in inheritance or print statement.

Forgetting to call the mro() method.

Class E inherits from B and C, and we print the MRO of E.