Section 1: What is a Variable?

Goal: Understand what a variable is and how to create one.

Explanation: A variable is a name that refers to a value stored in the computer's memory. You can use variables to hold numbers, text, lists, and much more. Creating a variable in Python is simple: you just give it a name and assign a value using the equals sign (=).

Code:

# Creating variables
my_number = 10
my_text = "Hello, Python!"
is_python_fun = True

What it means: We created three variables: `my_number` holding the integer 10, `my_text` holding the string "Hello, Python!", and `is_python_fun` holding the boolean value `True`.

Section 2: Common Data Types

Goal: Learn about the basic types of data Python can handle.

Explanation: Python has several built-in data types. Some of the most common ones are:

• **Integers (`int`):** Whole numbers (e.g., 5, -10, 0).
• **Floating-point numbers (`float`):** Numbers with a decimal point (e.g., 3.14, -0.5).
• **Strings (`str`):** Sequences of characters, enclosed in quotes (e.g., "hello", 'Python').
• **Booleans (`bool`):** Represent truth values, either `True` or `False`.

Code:

# Examples of different data types
integer_example = 100
float_example = 99.99
string_example = "This is text"
boolean_example = False

print(type(integer_example))
print(type(float_example))
print(type(string_example))
print(type(boolean_example))

What it means: The `type()` function tells us the data type of a variable. The output will show the type for each example.

Section 3: Variable Naming Rules

Goal: Learn how to name variables correctly in Python.

Explanation: There are a few rules and conventions for naming variables in Python:

• Names can contain letters, numbers, and underscores (_).
• Names cannot start with a number.
• Names are case-sensitive (e.g., `name` is different from `Name`).
• Avoid using Python keywords (like `if`, `for`, `while`).
• Use descriptive names that indicate what the variable holds (e.g., `user_name` instead of `un`).

Code:

# Valid variable names
first_name = "Alice"
user1_score = 100
_internal_value = 42

# Invalid variable names (will cause errors)
# 1st_place = "Gold"
# my-variable = "invalid"
# class = "Python Course"

What it means: The code shows examples of valid variable names. The commented-out lines are examples of invalid names that would result in a `SyntaxError` if you tried to run them.