Python3 Tutorial

Python3 Advanced Tutorial

Machine Learning

Python3 Tutorial - Create a Class for Arithmetic Operations

In this tutorial, we will learn how to create a Python class that implements basic arithmetic operations: addition, subtraction, multiplication, and division. This is a fundamental example of object-oriented programming in Python.

Class Definition

First, let's define a Calculator class with methods for each arithmetic operation:

class Calculator:
    def __init__(self, a, b):
        self.a = a
        self.b = b
    
    def add(self):
        return self.a + self.b
    
    def subtract(self):
        return self.a - self.b
    
    def multiply(self):
        return self.a * self.b
    
    def divide(self):
        if self.b == 0:
            return "Error: Division by zero"
        return self.a / self.b

Usage Example

Here's how to use our Calculator class:

# Create a Calculator instance
calc = Calculator(10, 5)

# Perform operations
print("Addition:", calc.add())        # Output: 15
print("Subtraction:", calc.subtract()) # Output: 5
print("Multiplication:", calc.multiply()) # Output: 50
print("Division:", calc.divide())     # Output: 2.0

Advanced Example with Error Handling

Let's enhance our Calculator class with better error handling:

class AdvancedCalculator:
    def __init__(self, a, b):
        self.a = a
        self.b = b
    
    def add(self):
        """Perform addition"""
        return self.a + self.b
    
    def subtract(self):
        """Perform subtraction"""
        return self.a - self.b
    
    def multiply(self):
        """Perform multiplication"""
        return self.a * self.b
    
    def divide(self):
        """Perform division with error handling"""
        try:
            if self.b == 0:
                raise ValueError("Cannot divide by zero")
            return self.a / self.b
        except ValueError as e:
            return f"Error: {str(e)}"
    
    def get_results(self):
        """Return all operation results as a dictionary"""
        return {
            'add': self.add(),
            'subtract': self.subtract(),
            'multiply': self.multiply(),
            'divide': self.divide()
        }

Summary

In this tutorial, we have created a Calculator class that demonstrates the basic principles of object-oriented programming in Python. The class encapsulates the data (numbers) and behavior (arithmetic operations) together, making the code more organized and reusable.

Key concepts covered:

• Class definition and initialization
• Instance methods
• Error handling for division by zero
• Object instantiation and method calls