Python Basics

Introduction

This repository contains the fundamental concepts of Python programming, covering a wide range of topics including variables, loops, data structures, functions, modules, file handling, exception handling, and object-oriented programming. It is designed to help beginners understand and practice Python basics.

Table of Contents

1. Variables
2. Loops
3. Data Structures
   • List
   • Tuple
   • Set
   • Dictionary
4. Functions
5. Modules and Packages
6. File Handling
7. Exception Handling
8. Object-Oriented Programming (OOP)
9. Common Python Errors

Variables

Variables are used to store data in Python. You can assign different types of data to variables:

x = 5  # integer
name = "Alice"  # string
price = 19.99  # float
is_available = True  # boolean

Loops

Loops are used to iterate over sequences or execute a block of code multiple times:

For Loop

for i in range(5):  # Will loop from 0 to 4
    print(i)

While Loop

count = 0
while count < 3:
    print(count)
    count += 1

Data Structures

List

A list is used to store multiple items in a single variable. Lists are ordered, changeable, and allow duplicate values.

fruits = ["apple", "banana", "cherry"]
fruits.append("orange")  # Add an element to the end

Tuple

A tuple is similar to a list, but it is immutable (cannot be changed).

coordinates = (4, 5)

Set

A set is an unordered collection that does not allow duplicate items.

unique_numbers = {1, 2, 3, 4}

Dictionary

A dictionary is used to store data in key-value pairs.

person = {"name": "Alice", "age": 25}
print(person["name"])

Functions

Functions are used to group reusable pieces of code.

def greet(name):
    return f"Hello, {name}!"

print(greet("Alice"))

Modules and Packages

Modules are Python files that contain functions or classes. You can import them into your code to reuse the functions:

import math
print(math.sqrt(16))

Packages are collections of modules that are organized in directories.

File Handling

You can use Python to read from or write to files:

with open("example.txt", "r") as file:
    content = file.read()
    print(content)

Exception Handling

Exceptions are errors that occur during execution. You can use try and except blocks to handle them gracefully:

try:
    result = 10 / 0
except ZeroDivisionError:
    print("You cannot divide by zero!")

Object-Oriented Programming

OOP is a paradigm that allows you to create classes and objects:

class Car:
    def __init__(self, brand, model):
        self.brand = brand
        self.model = model

    def start(self):
        print(f"{self.brand} {self.model} is starting.")

my_car = Car("Toyota", "Corolla")
my_car.start()

Common Python Errors

1. SyntaxError: Happens when Python cannot understand the code due to incorrect syntax.
2. IndentationError: Occurs when there is incorrect indentation in the code.
3. TypeError: Occurs when an operation is applied to an object of inappropriate type.

Conclusion

This repository serves as a starting point for anyone looking to learn Python. Each section contains examples to practice, making it easy to follow along and understand the concepts.