Python Programming Tutorial Summary

Introduction

• Instructor: Mosh Hamadani
• Focus: Learning Python for data science, machine learning, and web development.
• No prior knowledge required.

What You Can Do with Python

• Multi-purpose language used for:
  • Machine learning and AI (most popular language for these projects).
  • Web development (e.g., using Django framework).
  • Automation (to automate repetitive tasks).
• Examples of websites built with Python and Django:
  • YouTube
  • Instagram
  • Spotify
  • Dropbox
  • Pinterest

Setting Up Python

1. Download Python from python.org.
   • Make sure to check "Add Python to PATH" during installation.
2. Install a code editor (recommended: PyCharm).
   • Download the community edition from jetbrains.com/pycharm.
3. Create a new project in PyCharm:
   • Set the project name and location.
   • Create a new Python file (e.g., app.py).

Writing Your First Python Code

• Use print() function to display messages:
  • Example: print('Hello World')
• Variables: Used to store data in memory.
  • Example: age = 20
  • Changeable values can be assigned to variables (e.g., age = 30).

Data Types in Python

1. Strings: Textual data represented in quotes.
   • Example: name = 'Mosh'
2. Integers: Whole numbers.
   • Example: price = 19.95
3. Booleans: True or False values.
4. Floats: Numbers with decimal points.

User Input

• Use input() function to read user input:
  • Example: name = input('What is your name?')
• String concatenation can be done using + operator.

Type Conversion

• Converting types using built-in functions:
  • int(), float(), str(), and bool().

Arithmetic Operations

• Operators: +, -, *, /, //, %, ** (exponentiation).
• Augmented assignment operator: +=, -=, etc.
• Operator precedence rules apply (use parentheses for clarity).

Comparison Operators

• Used to compare values:
  • >, <, >=, <=, ==, !=

Logical Operators

• Combine multiple conditions:
  • and, or, not

Conditional Statements

• if statement: To create decision-making structures in code.
  • Example:

    if temperature > 30:
        print("It's a hot day.")
    

• elif and else: For multiple conditions.

Loops

• While Loops: Repeat code based on a condition.
  • Example:

    i = 1
    while i <= 5:
        print(i)
        i += 1
    

• For Loops: Iterate over a sequence (e.g., list or range).

Lists

• Used to store a collection of items:
  • Creation: names = ['John', 'Bob', 'Mosh']
  • Accessing elements: names[0]
  • Modifying elements: names[0] = 'Jane'
  • Methods: append(), insert(), remove(), clear(), count(), index().

Tuples

• Similar to lists but immutable (cannot be changed):
  • Creation: numbers = (1, 2, 3)

Summary

• This tutorial covers the basics of Python programming:
  • Setting up Python,
  • Writing simple programs,
  • Understanding variables, data types, user input, loops, and conditional statements.
• For further learning, consider Mosh's online courses at codewithmosh.com.