Programming language: Python
License: GNU General Public License v3.0 or later
Latest version: v0.3.1

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Python Fire PyPI

Python Fire is a library for automatically generating command line interfaces (CLIs) from absolutely any Python object.

  • Python Fire is a simple way to create a CLI in Python. [[1]](docs/benefits.md#simple-cli)
  • Python Fire is a helpful tool for developing and debugging Python code. [[2]](docs/benefits.md#debugging)
  • Python Fire helps with exploring existing code or turning other people's code into a CLI. [[3]](docs/benefits.md#exploring)
  • Python Fire makes transitioning between Bash and Python easier. [[4]](docs/benefits.md#bash)
  • Python Fire makes using a Python REPL easier by setting up the REPL with the modules and variables you'll need already imported and created. [[5]](docs/benefits.md#repl)


To install Python Fire with pip, run: pip install fire

To install Python Fire with conda, run: conda install fire -c conda-forge

To install Python Fire from source, first clone the repository and then run: python setup.py install

Basic Usage

You can call Fire on any Python object: functions, classes, modules, objects, dictionaries, lists, tuples, etc. They all work!

Here's an example of calling Fire on a function.

import fire

def hello(name="World"):
  return "Hello %s!" % name

if __name__ == '__main__':

Then, from the command line, you can run:

python hello.py  # Hello World!
python hello.py --name=David  # Hello David!
python hello.py --help  # Shows usage information.

Here's an example of calling Fire on a class.

import fire

class Calculator(object):
  """A simple calculator class."""

  def double(self, number):
    return 2 * number

if __name__ == '__main__':

Then, from the command line, you can run:

python calculator.py double 10  # 20
python calculator.py double --number=15  # 30

To learn how Fire behaves on functions, objects, dicts, lists, etc, and to learn about Fire's other features, see the [Using a Fire CLI page](docs/using-cli.md).

For additional examples, see [The Python Fire Guide](docs/guide.md).

Why is it called Fire?

When you call Fire, it fires off (executes) your command.

Where can I learn more?

Please see [The Python Fire Guide](docs/guide.md).


Setup Command Notes
install pip install fire
Creating a CLI Command Notes
import import fire
Call fire.Fire() Turns the current module into a Fire CLI.
Call fire.Fire(component) Turns component into a Fire CLI.
Using a CLI Command Notes
[Help](docs/using-cli.md#help-flag) command --help or command -- --help
[REPL](docs/using-cli.md#interactive-flag) command -- --interactive Enters interactive mode.
[Separator](docs/using-cli.md#separator-flag) command -- --separator=X Sets the separator to X. The default separator is -.
[Completion](docs/using-cli.md#completion-flag) command -- --completion [shell] Generates a completion script for the CLI.
[Trace](docs/using-cli.md#trace-flag) command -- --trace Gets a Fire trace for the command.
[Verbose](docs/using-cli.md#verbose-flag) command -- --verbose

Note that these flags are separated from the Fire command by an isolated --.


Licensed under the Apache 2.0 License.


This is not an official Google product.

*Note that all licence references and agreements mentioned in the Python Fire README section above are relevant to that project's source code only.