Python Modules: Creation and Usage Guide

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Python Modules: Creation and Usage Guide

What are Modules in Python?

Modules are simply Python files (with a .py extension) that contain Python code, including:

  • Functions
  • Classes
  • Variables
  • Executable code

They help you organize your code into logical units and promote code reusability.

Creating a Module

1. Basic Module Creation

Create a file named mymodule.py:

python

# mymodule.py
def greet(name):
    return f"Hello, {name}!"

def add(a, b):
    return a + b

PI = 3.14159

class Calculator:
    def multiply(self, x, y):
        return x * y

Using Modules

2. Importing Entire Modules

python

# main.py
import mymodule

# Use functions with module prefix
print(mymodule.greet("Alice"))  # Output: Hello, Alice!
result = mymodule.add(5, 3)
print(result)  # Output: 8

# Access variables
print(mymodule.PI)  # Output: 3.14159

# Use classes
calc = mymodule.Calculator()
print(calc.multiply(4, 5))  # Output: 20

3. Importing Specific Items

python

# Import specific functions/classes
from mymodule import greet, add, Calculator

# Use without module prefix
print(greet("Bob"))  # Output: Hello, Bob!
print(add(10, 20))   # Output: 30

calc = Calculator()

4. Import with Alias

python

# Import with alias
import mymodule as mm

print(mm.greet("Charlie"))  # Output: Hello, Charlie!

5. Import All Items (Not Recommended)

python

# Import everything (use cautiously)
from mymodule import *

print(greet("David"))  # Output: Hello, David!
print(PI)              # Output: 3.14159

Built-in Python Modules

Python comes with many built-in modules:

python

import math
import random
import datetime
import os

# Using built-in modules
print(math.sqrt(16))  # Output: 4.0
print(random.randint(1, 10))  # Random number between 1-10

current_time = datetime.datetime.now()
print(current_time)

Module Search Path

Python searches for modules in this order:

  1. Current directory
  2. Built-in modules
  3. Directories in PYTHONPATH environment variable
  4. Installation-dependent default path

python

import sys
print(sys.path)  # See where Python looks for modules

The __name__ Variable

Useful for making modules that can run as scripts or be imported:

python

# mymodule.py
def main():
    print("This runs when executed directly")

if __name__ == "__main__":
    # This code runs only when the file is executed directly
    main()
    print("Running as main program")
else:
    print("Module imported")

Creating Package Modules

Packages are directories containing multiple modules:

text

mypackage/
    __init__.py
    module1.py
    module2.py
    subpackage/
        __init__.py
        module3.py

python

# Import from packages
from mypackage import module1
from mypackage.subpackage import module3

Python Modules: All Arithmetic and Logical Operations

1. Arithmetic Operations Module

python

# arithmetic_ops.py
"""
Module containing all basic arithmetic operations
"""

def add(a, b):
    """Return the sum of a and b"""
    return a + b

def subtract(a, b):
    """Return the difference between a and b"""
    return a - b

def multiply(a, b):
    """Return the product of a and b"""
    return a * b

def divide(a, b):
    """Return the quotient of a divided by b"""
    if b == 0:
        raise ValueError("Cannot divide by zero")
    return a / b

def floor_divide(a, b):
    """Return the floor division of a by b"""
    if b == 0:
        raise ValueError("Cannot divide by zero")
    return a // b

def modulus(a, b):
    """Return the remainder of a divided by b"""
    if b == 0:
        raise ValueError("Cannot divide by zero")
    return a % b

def exponent(a, b):
    """Return a raised to the power of b"""
    return a ** b

def absolute(a):
    """Return the absolute value of a"""
    return abs(a)

def square(a):
    """Return the square of a"""
    return a ** 2

def cube(a):
    """Return the cube of a"""
    return a ** 3

def square_root(a):
    """Return the square root of a"""
    if a < 0:
        raise ValueError("Cannot calculate square root of negative number")
    return a ** 0.5

def factorial(n):
    """Return the factorial of n"""
    if n < 0:
        raise ValueError("Factorial is not defined for negative numbers")
    if n == 0:
        return 1
    result = 1
    for i in range(1, n + 1):
        result *= i
    return result

# Constants
PI = 3.141592653589793
E = 2.718281828459045

if __name__ == "__main__":
    # Test the module
    print("Testing Arithmetic Operations:")
    print(f"5 + 3 = {add(5, 3)}")
    print(f"10 - 4 = {subtract(10, 4)}")
    print(f"6 * 7 = {multiply(6, 7)}")
    print(f"15 / 3 = {divide(15, 3)}")
    print(f"17 // 5 = {floor_divide(17, 5)}")
    print(f"17 % 5 = {modulus(17, 5)}")
    print(f"2^8 = {exponent(2, 8)}")
    print(f"|-7| = {absolute(-7)}")
    print(f"5! = {factorial(5)}")

2. Logical Operations Module

python

# logical_ops.py
"""
Module containing all logical operations and boolean algebra
"""

def logical_and(a, b):
    """Return logical AND of a and b"""
    return a and b

def logical_or(a, b):
    """Return logical OR of a and b"""
    return a or b

def logical_not(a):
    """Return logical NOT of a"""
    return not a

def logical_xor(a, b):
    """Return logical XOR of a and b"""
    return (a and not b) or (not a and b)

def logical_nand(a, b):
    """Return logical NAND of a and b"""
    return not (a and b)

def logical_nor(a, b):
    """Return logical NOR of a and b"""
    return not (a or b)

def logical_xnor(a, b):
    """Return logical XNOR of a and b"""
    return (a and b) or (not a and not b)

def implies(a, b):
    """Return logical implication (a → b)"""
    return not a or b

def equivalent(a, b):
    """Return logical equivalence (a ↔ b)"""
    return (a and b) or (not a and not b)

def truth_table(operation, name="Operation"):
    """Generate and print truth table for a binary operation"""
    print(f"\n{name} Truth Table:")
    print("A\tB\tResult")
    print("-" * 20)
    
    for a in [True, False]:
        for b in [True, False]:
            result = operation(a, b)
            print(f"{a}\t{b}\t{result}")

# Bitwise operations
def bitwise_and(a, b):
    """Return bitwise AND of a and b"""
    return a & b

def bitwise_or(a, b):
    """Return bitwise OR of a and b"""
    return a | b

def bitwise_xor(a, b):
    """Return bitwise XOR of a and b"""
    return a ^ b

def bitwise_not(a):
    """Return bitwise NOT of a"""
    return ~a

def left_shift(a, n):
    """Return a left-shifted by n bits"""
    return a << n

def right_shift(a, n):
    """Return a right-shifted by n bits"""
    return a >> n

if __name__ == "__main__":
    # Test the module
    print("Testing Logical Operations:")
    
    a, b = True, False
    print(f"AND({a}, {b}) = {logical_and(a, b)}")
    print(f"OR({a}, {b}) = {logical_or(a, b)}")
    print(f"NOT({a}) = {logical_not(a)}")
    print(f"XOR({a}, {b}) = {logical_xor(a, b)}")
    
    # Generate truth tables
    truth_table(logical_and, "AND")
    truth_table(logical_or, "OR")
    truth_table(logical_xor, "XOR")
    
    # Test bitwise operations
    print(f"\nBitwise AND(5, 3) = {bitwise_and(5, 3)}")  # 1
    print(f"Bitwise OR(5, 3) = {bitwise_or(5, 3)}")     # 7
    print(f"Bitwise XOR(5, 3) = {bitwise_xor(5, 3)}")   # 6

3. Advanced Math Module

python

# advanced_math.py
"""
Module containing advanced mathematical operations
"""

import math

def is_prime(n):
    """Check if a number is prime"""
    if n <= 1:
        return False
    if n <= 3:
        return True
    if n % 2 == 0 or n % 3 == 0:
        return False
    
    i = 5
    while i * i <= n:
        if n % i == 0 or n % (i + 2) == 0:
            return False
        i += 6
    return True

def gcd(a, b):
    """Return greatest common divisor of a and b"""
    while b:
        a, b = b, a % b
    return abs(a)

def lcm(a, b):
    """Return least common multiple of a and b"""
    if a == 0 or b == 0:
        return 0
    return abs(a * b) // gcd(a, b)

def fibonacci(n):
    """Return the nth Fibonacci number"""
    if n <= 0:
        return 0
    elif n == 1:
        return 1
    
    a, b = 0, 1
    for _ in range(2, n + 1):
        a, b = b, a + b
    return b

def quadratic_roots(a, b, c):
    """Solve quadratic equation ax² + bx + c = 0"""
    discriminant = b**2 - 4*a*c
    
    if discriminant > 0:
        root1 = (-b + math.sqrt(discriminant)) / (2*a)
        root2 = (-b - math.sqrt(discriminant)) / (2*a)
        return (root1, root2)
    elif discriminant == 0:
        root = -b / (2*a)
        return (root,)
    else:
        real = -b / (2*a)
        imaginary = math.sqrt(-discriminant) / (2*a)
        return (complex(real, imaginary), complex(real, -imaginary))

if __name__ == "__main__":
    # Test the module
    print("Testing Advanced Math Operations:")
    print(f"Is 17 prime? {is_prime(17)}")
    print(f"GCD(48, 18) = {gcd(48, 18)}")
    print(f"LCM(12, 15) = {lcm(12, 15)}")
    print(f"Fibonacci(10) = {fibonacci(10)}")
    print(f"Quadratic roots of x² - 5x + 6: {quadratic_roots(1, -5, 6)}")

4. Main Program Using All Modules

python

# main_program.py
"""
Main program demonstrating usage of all mathematical and logical modules
"""

from arithmetic_ops import *
from logical_ops import *
from advanced_math import *

def demonstrate_arithmetic():
    print("=== ARITHMETIC OPERATIONS ===")
    print(f"Addition: 7 + 3 = {add(7, 3)}")
    print(f"Subtraction: 10 - 4 = {subtract(10, 4)}")
    print(f"Multiplication: 6 × 7 = {multiply(6, 7)}")
    print(f"Division: 15 ÷ 4 = {divide(15, 4)}")
    print(f"Exponent: 2^10 = {exponent(2, 10)}")
    print(f"Square root of 25: {square_root(25)}")
    print(f"Factorial of 5: {factorial(5)}")
    print(f"PI constant: {PI}")

def demonstrate_logical():
    print("\n=== LOGICAL OPERATIONS ===")
    a, b = True, False
    print(f"AND({a}, {b}) = {logical_and(a, b)}")
    print(f"OR({a}, {b}) = {logical_or(a, b)}")
    print(f"XOR({a}, {b}) = {logical_xor(a, b)}")
    print(f"NOT({a}) = {logical_not(a)}")
    
    # Bitwise operations
    print(f"\nBitwise AND(12, 25) = {bitwise_and(12, 25)}")
    print(f"Bitwise OR(12, 25) = {bitwise_or(12, 25)}")
    print(f"Bitwise XOR(12, 25) = {bitwise_xor(12, 25)}")

def demonstrate_advanced_math():
    print("\n=== ADVANCED MATH OPERATIONS ===")
    print(f"Is 29 prime? {is_prime(29)}")
    print(f"GCD(56, 98) = {gcd(56, 98)}")
    print(f"LCM(8, 12) = {lcm(8, 12)}")
    print(f"Fibonacci sequence up to 10: {[fibonacci(i) for i in range(11)]}")
    print(f"Quadratic equation 2x² + 4x - 6 = 0: {quadratic_roots(2, 4, -6)}")

def calculator_demo():
    print("\n=== CALCULATOR DEMO ===")
    while True:
        print("\nChoose operation:")
        print("1. Add     2. Subtract  3. Multiply  4. Divide")
        print("5. Exit")
        
        choice = input("Enter choice (1-5): ")
        
        if choice == '5':
            break
            
        if choice in ['1', '2', '3', '4']:
            try:
                num1 = float(input("Enter first number: "))
                num2 = float(input("Enter second number: "))
                
                if choice == '1':
                    result = add(num1, num2)
                    print(f"Result: {num1} + {num2} = {result}")
                elif choice == '2':
                    result = subtract(num1, num2)
                    print(f"Result: {num1} - {num2} = {result}")
                elif choice == '3':
                    result = multiply(num1, num2)
                    print(f"Result: {num1} × {num2} = {result}")
                elif choice == '4':
                    result = divide(num1, num2)
                    print(f"Result: {num1} ÷ {num2} = {result}")
                    
            except ValueError as e:
                print(f"Error: {e}")
            except ZeroDivisionError:
                print("Error: Cannot divide by zero")
        else:
            print("Invalid choice!")

if __name__ == "__main__":
    demonstrate_arithmetic()
    demonstrate_logical()
    demonstrate_advanced_math()
    calculator_demo()

5. Installation and Usage

  1. Save all files in the same directory:
    • arithmetic_ops.py
    • logical_ops.py
    • advanced_math.py
    • main_program.py
  2. Run the main program:

bash

python main_program.py
  1. Run individual modules:

bash

python arithmetic_ops.py
python logical_ops.py
python advanced_math.py

Key Features:

  • Complete arithmetic operations (+, -, ×, ÷, exponents, roots, etc.)
  • All logical operations (AND, OR, NOT, XOR, NAND, NOR, XNOR)
  • Bitwise operations for low-level programming
  • Advanced mathematical functions (prime checking, GCD, LCM, Fibonacci)
  • Error handling for invalid operations
  • Interactive calculator demo
  • Comprehensive testing for each module

This comprehensive set of modules covers all basic and advanced mathematical and logical operations you might need in Python programming!

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