Code Explanation:
🔹 1️⃣ Defining Base Class A
class A:
def f(self): return "A"
Base class A
Method f() returns "A"
🔹 2️⃣ Defining Class B (Inherits from A)
class B(A):
def f(self): return super().f() + "B"
B overrides method f
Calls super().f() first
Then appends "B"
So:
B.f() → A.f() + "B"
🔹 3️⃣ Defining Class C (Also Inherits from A)
class C(A):
def f(self): return super().f() + "C"
Same structure as B
Calls super().f()
Appends "C"
So:
C.f() → A.f() + "C"
🔹 4️⃣ Defining Class D (Multiple Inheritance)
class D(B, C):
def f(self): return super().f() + "D"
D inherits from B and C
Overrides f
Calls super().f()
Appends "D"
🔥 The Most Important Part: MRO
Let’s check the Method Resolution Order.
D.mro()
Result:
[D, B, C, A, object]
📌 Python will search methods in this order.
🧠 Step-by-Step Execution of D().f()
print(D().f())
🔹 Step 1: Call D.f()
Inside D.f():
return super().f() + "D"
Now we go to the next class in MRO after D, which is:
B
🔹 Step 2: Execute B.f()
Inside B.f():
return super().f() + "B"
Next class in MRO after B is:
C
🔹 Step 3: Execute C.f()
Inside C.f():
return super().f() + "C"
Next class in MRO after C is:
A
🔹 Step 4: Execute A.f()
Inside A.f():
return "A"
Returns:
"A"
🧩 Now We Build Backwards
From A.f() → returns "A"
Then:
C adds:
"A" + "C" → "AC"
B adds:
"AC" + "B" → "ACB"
D adds:
"ACB" + "D" → "ACBD"
✅ Final Correct Output
ACBD
.png)
Posts
0 Comments:
Post a Comment