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Abstraction in Python

Theory

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Abstraction in Python

Abstraction means show what the user needs and hide the messy inside. pay() is enough; don’t dump card-number checks into the caller. In Python, ABC can force children to implement methods: from abc import ABC, abstractmethod. A child that forgets the method fails when you instantiate it.

Everyday abstraction is also just a clean method name. ABC is the interview pattern. One sentence: clear interface, hidden internals. Then mention abstractmethod if they push.

Abstraction in Python — output — 12.56. Shape() would fail. Circle fills in area().

Exam tip

ABC idea in one sentence.

Example

# Abstraction
from abc import ABC, abstractmethod

class Shape(ABC):
    @abstractmethod
    def area(self):
        pass

class Circle(Shape):
    def __init__(self, r):
        self.r = r
    def area(self):
        return 3.14 * self.r * self.r

print(Circle(2).area())

Abstraction in Python — output: 12.56. Shape() would fail. Circle fills in area().

Short notes

DefHide complexity. Show useful actions.
RuleABC + abstractmethod.
RememberForce child methods.

# Abstraction from abc import ABC, abstractmethod class Shape(ABC): @abstractmethod def area(self): pass class Circle(Shape): def __init__(self, r): self.r = r def area(self): return 3.14 * self.r * self.r print(Circle(2).area())

Abstraction in Python

Example

Short notes

Questions

Abstraction in Python

Example

Short notes

Questions