00actions.py

from handofcats import as_subcommand


@as_subcommand
def foo(target: str):
    import heavy_module

    heavy_module.hello(target)


@as_subcommand
def bar(target: str):
    import heavy_module

    heavy_module.hello(target)


as_subcommand.run()

01actions.py

import typing as t
from handofcats import as_subcommand


@as_subcommand
def foo(targets: t.List[str]):
    import heavy_module

    for target in targets:
        heavy_module.hello(target)


@as_subcommand
def bar(targets: t.List[str]):
    import heavy_module

    for target in targets:
        heavy_module.hello(target)


as_subcommand.run()

02actions.py

from handofcats import as_subcommand


@as_subcommand
def foo(target: str):
    import heavy_module

    print("foo")
    heavy_module.hello(target)


@as_subcommand
def bar(target: str):
    import heavy_module

    print("bar")
    heavy_module.hello(target)


if __name__ == "__main__":
    import sys
    import itertools

    sep = "-"
    itr = iter(sys.argv[1:])
    while True:
        argv = list(itertools.takewhile(lambda x: x != sep, itr))
        if len(argv) == 0:
            break
        as_subcommand.run(argv=argv)

heavy_module.py

import time

print("loading")
time.sleep(0.5)
print("loaded")


def hello(target: str):
    print(f"hello {target}")

Makefile

gen: targets
	for i in `seq 10`; do echo $$i > targets/`printf "%02dtarget.txt" $$i`; done

targets:
	mkdir -p $@

00:
	ls targets/*.txt | xargs -n 1 python $(shell echo $@*.py) foo
01:
	python $(shell echo $@*.py) foo targets/*.txt
02:
	python $(shell echo $@*.py) \
 foo targets/target01.txt - bar targets/target02.txt - \
 foo targets/target03.txt - bar targets/target04.txt - \
 foo targets/target05.txt - bar targets/target06.txt - \
 foo targets/target07.txt - bar targets/target08.txt - \
 foo targets/target09.txt - bar targets/target10.txt