Python Programming Tutorial by Mosh Hamadani

Introduction

• Learn Python from scratch
• Ideal for beginners in data science, machine learning, and web development
• Python: multi-purpose, popular in machine learning (ML), web development, and automation

Applications of Python

• Machine learning and AI
• Web development using frameworks like Django
  • Sites powered by Django include YouTube, Instagram, Spotify, Dropbox, Pinterest
• Automation of repetitive tasks to increase productivity

Getting Started

1. Download Python:
   • Go to python.org, download latest version
   • Check 'Add Python to PATH' if on Windows
2. Install a Code Editor:
   • PyCharm is recommended
   • Community edition is free
   • Setup and create a new Python project

Writing Your First Python Program

• Create a Python file in your project
• Write a simple "Hello World" program using the print() function
• Strings in Python: sequence of characters, can be in single or double quotes

Variables

• Used to store data temporarily in memory
• Declaration: variable_name = value
• Examples: age = 20, price = 19.95, is_online = True
• Python is case-sensitive

User Input and Data Types

• Use input() to receive user input
• Convert inputs using functions:
  • int(), float(), str(), bool()
• Example: Calculate age from birth year

Working with Strings

• Strings are objects in Python with methods
• Methods include: upper(), lower(), find(), replace()
• Strings are immutable

Arithmetic Operators

• Addition, subtraction, multiplication, division
• Modulus % returns remainder
• Exponentiation using **
• Use augmented assignment (e.g., x += 3)

Comparison Operators

• Greater than >, less than <, equal to ==, not equal to !=
• Produce boolean values, used in conditions

Logical Operators

• and, or, not
• Combine multiple conditions in expressions

If Statements

• Make decisions in programs
• Syntax: if, elif, else
• Indentation represents a block of code

Loops in Python

While Loops

• Repeat a block of code
• Use with a condition, increment variables to prevent infinite loops

For Loops

• Iterate over sequences (lists, strings, etc.)
• for item in sequence:

Range Function

• Generate sequences of numbers
• range(start, stop, step)

Lists

• Used to store a sequence of objects
• Mutable: can change elements
• Methods include: append(), insert(), remove(), clear()
• Use indexes to access elements

Tuples

• Like lists but immutable
• Defined with parentheses ()
• Limited methods: count(), index()
• Use when you want to ensure data cannot be changed

Conclusion and Resources

• Additional courses available at codewithmosh.com
• Explore more advanced topics in Python
• Online Python course with a money-back guarantee and certification