Module 3: Data Types

Boolean Data Type

INTERACTIVE CHEAT SHEET

The Concept

In Python, a boolean (`bool`) represents one of two possible states: `True` or `False`. Booleans are essential for controlling the flow of a program, such as deciding whether a piece of code should run (using `if` statements). They are often the result of comparing values or evaluating conditions. Under the hood, Python treats `True` as `1` and `False` as `0`.

Key Points

Booleans have only two values: `True` or `False`.
They are used for logic and decision making in code.
Comparisons (like `10 > 5`) return a boolean.
Under the hood, `True` acts as `1` and `False` acts as `0`.
You can check a value's type using type(value), which returns <class 'bool'>.

Python · Memory model

Where True and False live in memory

In CPython, booleans are special integer objects. There is only one True and one False, and every boolean variable points to one of these two singletons.

Highlight a boolean value

flag = False·32 bytes total · 28 metadata

Shared boolean object in memory

Object header: type, ref count, flags

Payload bytes encoding 0 or 1 internally

False singleton: flag = False

Python keeps exactly one False object in memory. Any variable set to False just points at this shared object.

There is only one True object and one False object in a CPython process.
Any expression like a > b returns a reference to one of these shared objects.
Booleans are a tiny layer on top of the integer implementation, which is why True == 1 and False == 0 in Python.

Core Concept Mastery • Python Visual Series Module

🔥Module 1: Python Setup & Basics

Module 2: Variables & Memory

Module 3: Data Types

Module 4: Operators

Module 5: Conditional Statements

Module 6: Control Statements

Module 7: Lists, Tuples, Sets & Dictionaries

Module 8: Functions

Module 9: Classes & Objects

Boolean Data Type

The Concept

Key Points

Where True and False live in memory

False singleton: flag = False

Boolean Data Type

The Concept

Key Points

Where True and False live in memory

False singleton: flag = False