Docstring
A docstring is a string literal associated with a program element that documents its purpose, interface, behavior, or usage for people and tools.
Learn AI-Assisted Python Programming, Second Edition
A string literal placed in a program construct to document that construct and make its documentation available to programming tools.
- How it is used
- Uses docstrings to specify Python function behavior and guide Copilot while implementing functions.
- How deep it goes
- Explains placement, triple quotes, parameter descriptions, return statements, and doctest examples without discussing Python internals.
- Examples
- Demonstrates larger, create_word_list, and tot_pass_yds_player functions, including executable doctest cases.
- What you can do after
- Build Python functions from a chosen header and docstring, then test documented behavior with doctest examples.
Read how Learn AI-Assisted Python Programming, Second Edition explains docstring →
Python How-To
A docstring is a string literal associated with a module, class, or function that documents its purpose, parameters, return value, or other behavior.
- How it is used
- Documents callable behavior so users can find usage guidance without reading an implementation or consulting external resources.
- How deep it goes
- Works through placement, summaries, parameters, returns, exceptions, and style consistency; defers custom exception definitions.
- Examples
- Uses `help(isinstance)`, a division function’s reST docstring, and a decorated function whose metadata is preserved with `functools.wraps`.
- What you can do after
- Build it from scratch: write consistent function docstrings that describe inputs, outputs, and possible exceptions.
A Pythonic Adventure: From Python basics to a working web app
A docstring is a string literal associated with a Python module, class, or function that documents its purpose and behavior.
- How it is used
- Uses docstrings to make functions easier to understand and maintain.
- How deep it goes
- Defines docstrings and demonstrates parameter and return descriptions, but stops short of deeper documentation mechanics.
- Examples
- Demonstrates a read_menu function documenting its filename parameter, returned menu items, and whitespace removal.
- What you can do after
- Apply it in Python by adding a clear purpose, parameter description, and return description to a function.
Read how A Pythonic Adventure: From Python basics to a working web app explains docstring →
Clojure: The Essential Reference
A docstring is a string associated with a function definition that describes the function for users and tools.
- How it is used
- Documents a function’s purpose at definition time for later inspection.
- How deep it goes
- Defines its optional placement and Var storage, then demonstrates two ways to inspect it.
- Examples
- Shows a greeting function’s docstring displayed by `clojure.repl/doc` and retrieved from metadata.
- What you can do after
- Apply it via Clojure `defn` and `clojure.repl/doc` to attach and inspect function documentation.
Read how Clojure: The Essential Reference explains docstring →
Get Programming: Learn to code with Python
A string associated with a code component that documents its inputs, behavior, and outputs.
- How it is used
- Documents functions as reusable black boxes by stating their inputs, behavior, and outputs.
- How deep it goes
- Explains docstring structure and purpose with a worked function example, without descending into documentation tools or advanced formats.
- Examples
- Uses an attendance function and a remote-control black-box analogy to show documented inputs, behavior, and outputs.
- What you can do after
- Build it from scratch by writing a Python function specification with parameter types, behavior, and return information.
Read how Get Programming: Learn to code with Python explains docstring →
The Quick Python Book, Fourth Edition
A docstring is a string literal attached to a module, function, method, or class to provide documentation accessible to development tools and runtime introspection.
- How it is used
- Documents Python modules, functions, methods, and classes for readers, development tools, and runtime inspection.
- How deep it goes
- Explains placement, triple-quoted syntax, formatting, and __doc__ access, but does not descend into implementation internals.
- Examples
- Uses a word-counting module, a factorial function, and refactored text-processing functions to demonstrate docstring placement.
- What you can do after
- Apply it via Python’s __doc__ property, documentation tools, and help() to provide and inspect program documentation.
Read how The Quick Python Book, Fourth Edition explains docstring →
Related concepts
- signaturepart of · A signature is a declarative specification of the expected input and output fields of a language-model task or operation.
- functionpart of · A function is a callable program unit that performs an operation, may accept inputs, and can produce a result or side effect.
- commentcontrasts with · A comment is text or markup designated by a format's syntax as an annotation or non-content rather than ordinary executable or data content.
- summarizationhas part · Summarization is the process of condensing source content into a shorter representation that preserves its important information or meaning.
- stringkind of · A string is a programming-language value representing an ordered sequence of characters or character units as text.
These guides are generated from the text of Manning books by Manning's knowledge graph and link to the sections they draw on. The full books are available on liveBook and at manning.com.