Python Fire
https://github.com/google/python-fire- Category
- Developer Tools
- Rank
- No. 329Tools index
- Pricing
- Open Source
- Type
- TOOL
- Builder
- GitHub
- 28.2k stars
- Latest release
- v0.7.1
- Date
About
Google's library that automatically turns any Python object into a command-line interface — no argparse boilerplate.
What it does
Python Fire interprets command arguments as a path through Python values. It can access members, index collections, invoke routines, instantiate classes, and continue operating on returned results. It parses literal-looking inputs into Python values, then prints simple results or generated help.
Why it's ranked here
Its unusually broad object support makes quick internal tools and exploratory commands cheap to create. Generated help, execution traces, completion scripts, and an interactive mode add real utility. The unusual separator rules and automatic exposure model demand care for polished public interfaces.
What's good
It handles functions, classes, modules, objects, dictionaries, lists, and tuples through one consistent command model. Commands may use positional or named arguments, traverse nested results, and generate contextual help. Existing modules can also be explored without changing their source.
Tradeoffs
Framework flags normally require an isolated double-hyphen separator, while constructor and callable-object arguments require named flag syntax. Completion scripts must be regenerated when commands change. Verbose mode may reveal private members that remain unusable, and conflicting module names can break imports.
How to use it well
Use it for experiments, debugging, internal utilities, one-off Python scripts, and exploring unfamiliar modules from a terminal. Selectively expose a dictionary or object when unrestricted program contents would be excessive. It does not automatically maintain shell completion scripts after command changes.
Technical notes+
fire/core.py implements Fire, recursively consumes arguments, separates framework flags, records a FireTrace, prints results, and supports custom serialization. fire/parser.py uses argparse for shared flags and ast.literal_eval after rewriting bare names into strings. fire/trace.py records property access, calls, class instantiation, separators, errors, completion, and interactive entry. fire/helptext.py derives usage and help from inspection and docstrings. fire/__main__.py imports a module name or Python file for the python -m fire interface. pyproject.toml uses setuptools.build_meta, requires Python 3.7 or newer, and declares termcolor as the runtime dependency.
Observed
- License
- Apache License 2.0
- Primary language
- Python
- Install surface
- Available through pip, conda-forge, or source installation
- Interfaces
- Python library and command-line module interface
- Packaging
- PEP 517 build using setuptools.build_meta and wheel
- Python support
- Requires Python 3.7 or newer
- Platform classifiers
- OS independent, POSIX, macOS, and Unix
- Runtime dependency
- termcolor
Read from README.md, pyproject.toml, docs/api.md, docs/index.md, docs/guide.md, docs/benefits.md, docs/using-cli.md, docs/installation.md, docs/troubleshooting.md, fire/core.py, fire/trace.py, fire/parser.py, fire/__init__.py, fire/__main__.py, fire/helptext.py.
What it can do
Convert Python function into command-line interface
Python function → Command-line interface with function parameters as CLI arguments
Convert Python class into command-line interface
Python class → Command-line interface with class methods as CLI commands
Convert Python module into command-line interface
Python module → Command-line interface with module functions as CLI commands
Generate automatic help documentation for CLI
Python object with docstrings → Command-line help text and usage instructions
Parse command-line arguments automatically
Command-line arguments and Python object → Parsed arguments mapped to Python function/method parameters
Execute Python code from command line
Command-line arguments and target Python object → Function/method execution results
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