Python Programming Tutorial by Mosh Hamadani

Introduction

• Python is a multi-purpose programming language.
• Popular for machine learning, data science, web development, and automation.
• Examples of websites using Python: YouTube, Instagram, Spotify, Dropbox, Pinterest.
• No prior programming knowledge needed to start.

Setup Python Environment

• Download Python from python.org.
• Install Python and check "Add Python to PATH" on Windows.
• Install a code editor, recommended: PyCharm Community Edition.
• Configure PyCharm and create a new project.

Writing First Python Program

• Create a Python file (e.g., app.py).
• Use the print() function to output "Hello World".
• Strings are sequences of characters surrounded by quotes.

Understanding Variables

• Variables store data temporarily in memory.
• Declare variables using name = value syntax.
• Example: age = 20, use print(age) to display variable value.
• Variables can store numbers, strings, and booleans.

User Input

• Use input() function to receive user input.
• Convert input to different types using int(), float(), str(), bool().
• Example: Calculate age from birth year using input.

Working with Strings

• Strings are objects with methods like .upper(), .lower(), .find(), .replace().
• Example: string.upper() converts a string to uppercase.
• Use in keyword to check if a substring exists in a string.

Arithmetic Operations

• Python supports addition +, subtraction -, multiplication *, division /.
• Division / returns float, // returns integer.
• Modulus % returns remainder. Exponentiation ** for powers.
• Augmented assignment operators: +=, -=, *=, /=.

Operator Precedence

• Order: parentheses (), exponentiation **, multiplication/division *, /, //, %, addition/subtraction +, -.
• Use parentheses to change default precedence.*

Comparison and Logical Operators

• Comparison: >, >=, <, <=, ==, !=.
• Logical: and, or, not.

Conditional Statements

• Use if, elif, else for decision making.
• Example: Temperature check with different messages.

Looping Constructs

• While Loop: Repeats code block while condition is true.
• Example: Print numbers 1 to 5 using a while loop.
• For Loop: Iterates over a sequence like a list or range.
• Example: Print numbers in a list using a for loop.

Lists

• Lists store multiple items in an ordered sequence.
• Modify lists using methods like .append(), .insert(), .remove(), .clear().
• Access elements with indexes, can use slicing list[start:end].

Tuple

• Tuples are like lists but immutable.
• Use parentheses () to define a tuple.
• Useful when you need a read-only list of items.

Input and Output

• Implement exercises to reinforce learning, such as weight converter.
• Convert between data types to ensure correct arithmetic operations.

Additional Resources

• Mosh's online coding school offers more in-depth courses in Python and other development areas.
• Python course available with 30-day money-back guarantee and certificate of completion.