Python Variables

What are Variables?

Variables are containers for storing data values. In Python, you don't need to declare a variable's type explicitly - Python figures it out automatically!

Creating Variables

To create a variable, you simply assign a value to a name using the = operator:

name = "Alice"
age = 25
is_student = True

Variable Types

• String (str): Text data, wrapped in quotes
• Integer (int): Whole numbers
• Float: Decimal numbers
• Boolean (bool): True or False values

Interactive Example

Try editing the code below and click "Run" to see the output:

(No output yet)

Naming Rules

• Variable names must start with a letter or underscore
• Can contain letters, numbers, and underscores
• Are case-sensitive (name and Name are different)
• Cannot use Python keywords (like if, for, while)

# Valid variable names
user_name = "Alice"
age1 = 25
_private = True

# Invalid variable names (don't use these!)
# 1name = "Alice"  # Can't start with a number
# user-name = "Alice"  # Can't use hyphens
# if = 5  # Can't use keywords