Variables and Data Types
In Python, a variable is like a labeled box where you store a value. You can change what’s inside the box later. Python has several basic data types: integers (whole numbers), floats (decimals), strings (text), and booleans (True/False).
Variables store data; data types define what kind of data (number, text, etc.).
Creating Variables
You don’t need to declare a type – Python figures it out automatically.
age = 25 # integer
price = 19.99 # float
name = "AI Assistant" # string
is_ready = True # booleanData Types Explained
- int: Whole numbers (e.g., -10, 0, 42).
- float: Decimal numbers (e.g., 3.14, -0.001).
- str: Text enclosed in quotes (single or double).
- bool: True or False (used in conditions).
- list: Ordered collection of items: [1,2,3].
- dict: Key‑value pairs: {"name": "AI"}.
Why Data Types Matter in AI
AI data comes as numbers (arrays), text (strings), and labels (booleans). Understanding types helps you clean and transform data correctly.
# Check the type of a variable
print(type(age)) #
print(type(name)) # Simple Operations
x = 10
y = 3
print(x + y) # 13
print(x * y) # 30
print(x / y) # 3.333...
print(x // y) # 3 (integer division)Two Minute Drill
- Variables store data; no need to declare type.
- Common types: int, float, str, bool, list, dict.
- Use
type()to check type. - Arithmetic: +, -, *, /, //, %.
Two Minute Drill
- Variables store data; no need to declare type.
- Common types: int, float, str, bool, list, dict.
- Use
type()to check type. - Arithmetic: +, -, *, /, //, %.
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