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Python Code Samples

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5 matches
OOP & classes medium

How to Use __slots__ in Python Classes for Memory Efficiency

Defines classes with __slots__ to prevent dynamic attribute creation and reduce memory usage, including inheritance with additional slots.

slots oop memory
Python 
```python
class Person:
    __slots__ = ("name", "age")

    def __init__(self, name: str, age: int):
        self.name = name
        self.age = age

    def greet(self) -> str:
        return f"Hi, I'm {self.name} and I'm {self.age} years old."


class Employee(Person):
    __slots__ = ("role",)

    def __init__(se…
13 0 Open
OOP & classes medium

How to Use abstractmethod in Python

Define an abstract base class with abstract methods to enforce a common interface across subclasses.

oop abstract abc
Python 
import abc

class Shape(abc.ABC):
    @abc.abstractmethod
    def area(self):
        """Calculate area of the shape."""

    @abc.abstractmethod
    def perimeter(self):
        """Calculate perimeter of the shape."""

class Rectangle(Shape):
    def __init__(self, width, height):
        self.width = width
        s…
10 0 Open
OOP & classes medium

Python Abstract Class with Concrete Subclasses

Define an abstract base class with abstract methods and implement them in concrete subclasses like Rectangle and Circle.

abc abstract-methods oop
Python 
from abc import ABC, abstractmethod

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

    @abstractmethod
    def perimeter(self):
        pass

class Rectangle(Shape):
    def __init__(self, width, height):
        self.width = width
        self.height = height

    def area(self):
        ret…
14 0 Open
OOP & classes medium

Understanding Multiple Inheritance Method Resolution Order in Python

This code demonstrates how Python's MRO determines which greet method is called in a diamond inheritance scenario, and prints the full MRO for class D.

multiple inheritance mro inheritance
Python 
class A:
    def greet(self):
        return "Hello from A"

class B(A):
    def greet(self):
        return "Hello from B"

class C(A):
    def greet(self):
        return "Hello from C"

class D(B, C):
    pass


if __name__ == "__main__":
    d = D()
    print(d.greet())
    print(D.__mro__)
12 0 Open
System design patterns medium

Template Method Workflow Steps Base Class in Python

Define a reusable workflow skeleton in a base class and let subclasses fill in each step with the Template Method design pattern.

template-method design-patterns abc
Python 
from abc import ABC, abstractmethod


class DataPipeline(ABC):
    """Template Method pattern: defines a workflow skeleton."""

    def run(self):
        """Template method - defines the algorithm's structure."""
        result = {"extracted": False, "transformed": False, "loaded": False}
        raw_data = self._ext…
13 0 Open

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