Code Explanation:
1. Creating the First Parent Class
class A:
- Defines a class named A.
- This class acts as the base parent class.
- Other classes will inherit its methods.
2. Defining the Show Method
def show(self): return "A"
- Defines an instance method named show().
- The method returns the string "A".
- This method will eventually be reached through the inheritance chain.
3. Creating the Second Class
class B(A):
- Defines a class named B.
- B inherits from class A.
- Therefore, class B can access methods defined in class A.
4. Overriding the Parent Method
def show(self): return "B" + super().show()
- Defines another show() method inside class B.
- This overrides the inherited show() method.
- super().show() calls the next implementation of show() according to Python's MRO.
- In this case, when used through class B directly, the next class is A.
- The returned strings are combined.
5. Creating the Third Class
class C(A):
- Defines another class named C.
- It also inherits from class A.
- Both B and C share the same parent class.
6. Overriding the Show Method Again
def show(self): return "C" + super().show()
- Defines a show() method inside class C.
- It overrides the inherited method.
- "C" is concatenated with the result of super().show().
- The next method is determined by the MRO of the actual object.
7. Creating the Multiple Inheritance Class
class D(B, C): pass
- Defines class D.
- It inherits from both B and C.
- This is called Multiple Inheritance.
- pass means no additional methods or attributes are defined inside class D.
8. Calling the Show Method
print(D().show())
- D() creates an object of class D.
- .show() calls the method according to Python's Method Resolution Order.
- Python follows the MRO sequence:
D → B → C → A → object
- Class B adds "B" to the result.
- super() inside B moves to C.
- Class C adds "C" to the result.
- super() inside C moves to A.
- Class A returns "A".
Understanding MRO Execution
Method Resolution Order
Class D
Child class
Class B
B
Class C
C
Class A
A
Returns the final string
Actual execution order: D → B → C → A
Final Output
Correct Output
BCA
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