callixir 0.1.0

A Python module for calling functions by string with argument support

Callixir

A small and convenient tool for implementing command execution in any application. Suitable for a console application or a social media bot.

Its principle of operation is simple: the user sends a string containing the command name and its arguments, if required. The next step is to execute the corresponding method based on this string.

Developed and tested on Python version 3.12. Support for other, later versions has not been addressed yet.

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Example

from callixir import SimpleShell

shell = SimpleShell()

@shell.reg("echo")
def cmdEcho(arg: str):
	return f"Echo {arg}"

@shell.reg("sum")
def сmdSum(a: int, b: int):
	return a + b

@shell.reg("log")
def cmdLog(*args: str):
	return ", ".join(args)

result = shell.execute("echo Hello_World!")
print(result.result) # Echo Hello_World!

result = shell.execute("sum 1 2")
print(result.result) # 3

result = shell.execute("log 1 2 Hi 10 J 100 \"many words in one\" 999 71")
print(result.result) # 1, 2, Hi, 10, J, 100, many words in one, 999, 71

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Installing

Install Callixir via pip:

pip install callixir

Features

• Convenient handling of arguments, they correspond to the signature of the arguments in the method;
• Support for asynchronous commands;
• Support for named arguments.

Async example

from callixir import AsyncSimpleShell
import asyncio

shell = AsyncSimpleShell()

@shell.reg("echo")
async def cmdEcho(arg: str):
	return f"Echo {arg}"

@shell.reg("sum")
async def сmdSum(a: int, b: int):
	return a + b

@shell.reg("log")
async def cmdLog(*args: str):
	return ", ".join(args)

async def main():
	result = await shell.execute("echo Hello_World!")
	print(result.result) # Echo Hello_World!

	result = await shell.execute("sum 1 4")
	print(result.result) # 5

	result = await shell.execute("log nova prospekt \"Async cmd\"")
	print(result.result) # nova, prospekt, Async cmd

asyncio.run(main())

Named arguments

The handler can work with function's named arguments (**kwargs). Furthermore, the same arguments undergo data type conversion for example, if the annotation is int, then all kwargs arguments will be converted to int.

A named argument can be specified in the string in two ways: --argument_name=value, --argument_name value. Values can also be enclosed in double quotes: --argument_name "multiple values".

Example

from callixir import SimpleShell

shell = SimpleShell()

@shell.reg("info")
def cmdInfo(**kwargs: str):
	data = []

	for key, value in kwargs.items():
		data.append(f"key = {key}\tvalue = {value}")

	return "\n".join(data)

@shell.reg("calc")
def cmdCalc(a: float, b: float, **kwargs: str):
	action = kwargs.get("action", "+")

	if action == "+": return a+b
	elif action == "-": return a-b
	elif action == "*": return a * b
	elif action == "/": return a / b
	else: return "Incorrect type of action"

def main():
	result = shell.execute("info --arg1=value1 --arg2 value2 --apple red --datetime=\"03.11.2025 15:31\"")
	print(result.result)
	'''
	key = arg1	value = value1
	key = arg2	value = value2
	key = apple	value = red
	key = datetime	value = 03.11.2025 15:31
	'''

	result = shell.execute("calc 1 2")
	print(result.result) # 3.0

	result = shell.execute("calc 1 2 --action +")
	print(result.result) # 3.0

	result = shell.execute("calc 1 2 --action *")
	print(result.result) # 2.0

	result = shell.execute("calc 1 2 --action pow")
	print(result.result) # Incorrect type of action

main()