Module 3: Data Types

String Data Type

INTERACTIVE CHEAT SHEET

The Concept

In Python, a string (`str`) is a sequence of characters used to represent text. Strings are created by enclosing characters in single quotes (`'...'`), double quotes (`"..."`), or triple quotes (`"""..."""` or `'''...'''`) for multiline strings. Strings are immutable, meaning once created, their contents cannot be changed. You can perform various operations on strings like concatenation, repetition, indexing, and slicing.

Key Points

Strings represent text: "hello", 'Python'.
Enclosed in single, double, or triple quotes.
Strings are immutable (cannot be changed after creation).
You can access individual characters using indexing (e.g., `text[0]`).
You can check a value's type using type(value), which returns <class 'str'>.

How Python Stores Strings

A Python str is a string object plus a sequence of character bytes. The object header holds things like length and encoding details, while the data region holds the actual characters. More characters mean more data bytes, but the header stays roughly the same size.

Current Value

s = "hi"

Even a tiny string like "hi" needs a Python string object plus space to hold its characters.

Approximate Size

bytes

Memory Blocks (1 square = 1 byte)

String Object Header & Metadata (~32 bytes)

Character Data Bytes (text content)

Other Objects / Unused Neighbouring Memory

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

String Data Type

The Concept

Key Points

How Python Stores Strings

String Data Type

The Concept

Key Points

How Python Stores Strings