B.Tech • Chapter 9

Advanced OOP: Inheritance, Polymorphism, & MRO

B.Tech level module on Advanced OOP.

6 note blocks4 exam topics

🎯 Exam Focus Areas

Evaluate time complexity of related algorithms.Understand memory management and background architecture.Analyze code snippets for bugs or inefficiencies.Explain theoretical concepts with real-world technical examples.

Inheritance allows a class to inherit attributes and methods from another class. Python supports Multiple Inheritance, which requires a specific algorithm to resolve method calls.

Advanced Engineering Concepts

Method Resolution Order (MRO) dictates how Python searches for base classes during method calls in a multiple inheritance scenario. Python uses the C3 Linearization algorithm to determine the MRO. Polymorphism allows methods to be overridden in child classes, ensuring that the correct method is called based on the object's actual class at runtime. The 'super()' function dynamically accesses methods of the parent class following the MRO.

1Understand the Big O time and space complexities involved.
2Ensure memory leaks and race conditions are mitigated.
3Adhere to PEP 8 standards for clean, readable code.
4Utilize unit testing to verify algorithmic correctness.

Code Implementation

class A:
    def process(self): print("A")

class B(A):
    def process(self):
        print("B")
        super().process()

class C(A):
    def process(self):
        print("C")
        super().process()

# Multiple Inheritance
class D(B, C):
    def process(self):
        print("D")
        super().process()

obj = D()
obj.process()
print(D.mro()) # D -> B -> C -> A -> object

📝 Quick Revision Points

1Review the CPython implementation details.
2Practice the code snippets until syntax is committed to memory.
3Test edge cases and exception handling.
4Understand trade-offs between different data structures.

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class A: def process(self): print("A") class B(A): def process(self): print("B") super().process() class C(A): def process(self): print("C") super().process() # Multiple Inheritance class D(B, C): def process(self): print("D") super().process() obj = D() obj.process() print(D.mro()) # D -> B -> C -> A -> object