Indentation
Indentation is leading whitespace or spacing that positions content relative to its surrounding area and can represent hierarchy or structural nesting.
A Pythonic Adventure: From Python basics to a working web app
Indentation is leading whitespace that Python uses to delimit statement blocks and determine control structure.
- How it is used
- Uses indentation to define Python statement blocks while building a menu that repeatedly validates user input.
- How deep it goes
- Explains block membership and four-space layout through a while-loop correction, stopping short of deeper whitespace rules.
- Examples
- Demonstrates nested indentation in Erik’s menu function and practices finding errors with the editor’s Check button.
- What you can do after
- Diagnose missing-indentation errors with the editor’s Check button and apply correctly nested indentation to menu loops.
Read how A Pythonic Adventure: From Python basics to a working web app explains indentation →
The Quick Python Book, Fourth Edition
Whitespace placed at the beginning of source lines to visually align code and, in Python, delimit nested blocks.
- How it is used
- Delimits the bodies of Python conditionals, loops, and functions while keeping their structure visible.
- How deep it goes
- Explains block levels and nesting through examples, then addresses indentation errors and exceptions to the usual line layout.
- Examples
- Uses a factorial loop, an if-elif-else conditional, a nested function body, and erroneous unindentation.
- What you can do after
- Diagnose/debug with indentation levels to identify block membership and recognize common indentation errors.
Read how The Quick Python Book, Fourth Edition explains indentation →
Get Programming: Learn to code with Python
- How it is used
- Uses indentation to mark which Python statements belong to conditional and function code blocks.
- How deep it goes
- Explains four-space conditional indentation and compares nested with sequential decisions, then applies the same idea to function bodies.
- Examples
- Contrasts an indented conditional print with an unindented final print, and compares nested and unnested number checks.
- What you can do after
- Practice/perform indentation when writing conditional blocks, nested decisions, and function bodies in Python.
Read how Get Programming: Learn to code with Python explains indentation →
Learn AI-Assisted Python Programming, Second Edition
- How it is used
- Uses indentation to group statements while reading and writing Python functions, conditionals, and loops.
- How deep it goes
- Explains nested indentation levels and a behavioral error, without descending into interpreter internals.
- Examples
- Uses an hour-based greeting, larger-value function, word-scoring function, password checker, and nested country loops.
- What you can do after
- Diagnose/debug with it: identify misplaced Python statements and adjust indentation to preserve intended control-flow blocks.
Read how Learn AI-Assisted Python Programming, Second Edition explains indentation →
F# in Action: A Revised Edition of Get Programming with F#
Indentation is leading whitespace in source code that can delimit or structure blocks according to a language's syntax rules.
- How it is used
- Uses indentation to define F# scopes and make code structure readable without brace-heavy boilerplate.
- How deep it goes
- Explains indentation through function and local-binding layout, without detailing parser rules or complex nested constructs.
- Examples
- Demonstrates an arithmetic function with local bindings and a greeting function executed in F# Interactive.
- What you can do after
- Apply it via F# scripts to structure function bodies and limit local symbol visibility.
Read how F# in Action: A Revised Edition of Get Programming with F# explains indentation →
Fabulous Adventures in Data Structures and Algorithms
Indentation is horizontal whitespace used to indicate nesting or structural level in formatted source code.
- How it is used
- Improves source-code readability while a pretty printer lays out parsed expressions under line-width constraints.
- How deep it goes
- Defines indentation through formatting goals and implements it in grouped expression and parenthesis-list documents.
- Examples
- Uses conditional statements, comments, nested member access, and comma-separated call arguments to compare indentation choices.
- What you can do after
- Builds indentation rules into a C# document visitor that formats parse-tree expressions at a selected width.
Read how Fabulous Adventures in Data Structures and Algorithms explains indentation →
Related concepts
- loopconfigures · A loop is a programming control-flow construct that repeatedly executes a block of instructions according to an iteration rule or continuation condition.
- blockconfigures · A code block is a grouped region of code treated as a unit, with boundaries and scope or execution behavior determined by its language or context.
- functionconfigures · A function is a callable program unit that performs an operation, may accept inputs, and can produce a result or side effect.
- YAMLpart of · YAML is a human-readable data-serialization standard for representing structured data, including mappings, sequences, and scalar values.
- F# syntaxused by · F# syntax is the set of lexical and grammatical rules that determine how F# programs are written and parsed.
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