Code Explanation:
1️⃣ Creating Class A
class A:
This creates a class named A.
2️⃣ Defining x in Class A
x = 10
Class A has a class attribute:
A.x = 10
So 10 is stored at the class level.
3️⃣ Creating Class B
class B(A):
B inherits from A.
Therefore, B can access attributes and methods from A.
The inheritance relationship is:
B → A → object
4️⃣ Defining Another x in B
x = 20
B defines its own x.
So now:
A.x = 10
B.x = 20
The x in B overrides the inherited class attribute for normal lookup through B.
5️⃣ Defining Method f()
def f(self):
This defines a method called f() inside class B.
self represents the current B object.
6️⃣ Accessing self.x
return self.x + super().x
The first part is:
self.x
Since the object was created from B, Python looks for x through the object's class.
It finds:
B.x = 20
Therefore:
self.x → 20
7️⃣ Understanding super().x
The second part is:
super().x
This is the important trick.
super() starts attribute lookup after class B in the MRO.
The MRO is:
B → A → object
So super().x finds x in A:
A.x = 10
Therefore:
super().x → 10
8️⃣ Adding Both Values
Now the return statement becomes:
20 + 10
which gives:
30
9️⃣ Creating the Object and Calling f()
print(B().f())
First:
B()
creates an object of class B.
Then:
.f()
calls the f() method.
Inside f():
self.x → 20
super().x → 10
Therefore:
20 + 10 = 30
🔄 Complete Execution Flow
B().f()
↓
self.x
↓
B.x = 20
super().x
↓
skip B
↓
A.x = 10
20 + 10
↓
30
🎯 Final Output
30
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