File-like object
A file-like object is an object that exposes operations resembling file operations, such as reading or writing, whether or not it is backed by a filesystem file.
Python Workout, Second Edition
A file-like object is an object that provides an interface resembling a file, including operations such as reading, writing, or iteration.
- How it is used
- Unifies files and compatible objects behind one interface for reading, writing, iteration, buffering, and filesystem abstraction.
- How deep it goes
- Defines the shared API, line iteration, modes, context management, and chunked binary reads without detailing object internals.
- Examples
- Uses open results, line loops, binary chunks, StringIO objects, and an in-memory testing workaround.
- What you can do after
- Apply it via Python's open and StringIO to process files, stream lines or chunks, and isolate tests from the filesystem.
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Python Workout: 50 ten-minute exercises
A file-like object is an object that exposes an interface resembling file operations such as reading and writing without necessarily being backed by a filesystem file.
- How it is used
- Uses a shared reading and writing interface to hide filesystem differences and support efficient file processing.
- How deep it goes
- Defines shared APIs, line iteration, text or binary modes, and buffering, but does not develop the underlying implementations.
- Examples
- Demonstrates open-based line loops, binary chunks, final-line extraction, and StringIO-backed tests.
- What you can do after
- Apply it via open and StringIO to read, write, iterate, simulate files, and avoid filesystem access in tests.
Read how Python Workout: 50 ten-minute exercises explains file-like object →
Related concepts
- StringIOincludes · StringIO is a library class that provides a file-like interface for reading and writing text in an in-memory string buffer.
- openproduced by · Open is an operation that establishes access to a named file or other I/O resource and returns an associated handle or object.
- contractuses · An API contract is a specification of the operations, data, and behavioral expectations that govern interactions between software components.
- file objectincludes · A file object is a program-accessible representation of an open file or stream, including its access state and input/output operations.
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