[Solved] What will be the output of this code?class A: def greet(self): print('Hello from A') class B(A): def greet(self): print('Hello from B') class C(A): def greet(self):... | Python

Python - Multiple Inheritance and Method Resolution

What will be the output of this code?

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

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

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

class D(B, C):
    pass

d = D()
d.greet()

AHello from B

BHello from A

CHello from C

DHello from D

Step-by-Step Solution

Solution:

Step 1: Understand method resolution order (MRO)
Class D inherits from B and C. Python looks for greet() in D, then B, then C, then A.
Step 2: Identify which greet() is called
D has no greet(), so it calls B's greet() first, printing 'Hello from B'.
Final Answer:
Hello from B -> Option A
Quick Check:
MRO chooses first parent method [OK]

Quick Trick: MRO calls first parent's method in order [OK]

Common Mistakes:

Assuming C's greet() is called
Expecting A's greet() to run
Thinking D has greet() method

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What will be the output of this code?

Step 1: Understand method resolution order (MRO)

Step 2: Identify which greet() is called

Final Answer:

Quick Check:

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