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Automatically generate a simple CLI.

Project description


Automatically generate a simple CLI.


pip install funcli

Basic Usage

def main(*args: int):
	print("Sum:", sum(args))

if __name__ == '__main__':
	import funcli

# $ python 1 2 3
# Sum: 6

--help is autogenerated:

$ python -h
usage: [-h] [args [args ...]]

positional arguments:

optional arguments:
	-h, --help  show this help message and exit


funcli.main(spec = None)

Sugar. spec defaults to the main function from the caller's scope. Calls on spec, and calls sys.exit with the return value., args = None, converters = None)
  • spec is either a callable, a sequence of callables, or a dict mapping strings to nested specs
  • args default to sys.argv[1:]
  • converters is a mapping from types (or whatever you want to use as annotations) to a function that parses a command line argument

Given functions foo, bar, baz, here are some sample invocations:, ['arg0']) # Calls foo('arg0'){ foo, bar }, ['bar', 'arg0']) # Calls bar('arg0'){ 'beep': foo, 'bloop': [bar, baz] }, ['beep', 'arg0']) # Calls foo('arg0'){ 'beep': foo, 'bloop': [bar, baz] }, ['bloop', 'bar', 'arg0']) # Calls bar('arg0')

bool arguments

Non-optional bool values should be passed as True and False on the command line. Optional bool values, on the other hand, must be omitted.

def f(warnings: bool = False): ..., ['--warnings']) # f(warnings = True)

Note: currently, if the default value is True, there is no way to pass False.


Built-in converters handle int, float, bool, and pathlib.Path. Everything else is kept as a str.


Because of argparse limitations:

  • **kwargs aren't supported; if your function has them, they'll always be empty
  • optional arguments cannot be positional; f(a = 'default') has to be invoked as python --a=nondefault

Project details

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