Python hello world

Python Tutorial

Python is a high-level, interpreted, general-purpose programming language. It is designed to be readable and easy to learn, with a focus on code readability and simplicity. Python is widely used for web development, data science, machine learning, and many other applications.

Installation

You can download and install Python from the official Python website. Once installed, you can check if Python is installed correctly by opening a terminal window and typing:

python --version

Basic Syntax

Python uses indentation to define blocks of code. Indentation is typically done with spaces, and it is important to be consistent with the amount of indentation used.

if condition:
    # code block
else:
    # code block

Data Types

Python has a variety of built-in data types, including:

• Integers: int
• Floats: float
• Strings: str
• Lists: list
• Tuples: tuple
• Dictionaries: dict

Variables

Variables are used to store data in Python. They are declared using the = assignment operator.

name = "John Doe"
age = 30

Operators

Python supports a variety of operators, including:

• Arithmetic operators: +, -, *, /, %
• Comparison operators: ==, !=, <, >, <=, >=
• Logical operators: and, or, not

Functions

Functions are used to group code together and perform specific tasks. They are defined using the def keyword.

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

greet("John Doe")

Classes

Classes are used to create objects. They are defined using the class keyword.

class Person:
    def __init__(self, name, age):
        self.name = name
        self.age = age

    def greet(self):
        print(f"Hello, my name is {self.name} and I am {self.age} years old.")

john = Person("John Doe", 30)
john.greet()

Modules

Modules are used to organize code into reusable units. They are imported using the import statement.

import math

print(math.pi)

Object-Oriented Programming

Python supports object-oriented programming (OOP) principles. OOP allows you to create classes and objects, which can be used to model real-world entities.