00hello.py

from handofcats import as_command


@as_command
def hello(*, name="world") -> str:
    return f"hello, {name}"

01nums.py

from handofcats import as_command


@as_command
def nums() -> list:
    return list(range(10))

02custom-output.py

from handofcats import as_command, Config
import json


@as_command(
    config=Config(cont=lambda x: print(json.dumps(x, indent=2, ensure_ascii=False)))
)
def people() -> list:
    import faker

    faker.Faker.seed(0)
    fake = faker.Faker("ja_JP")
    return [{"no": i, "name": fake.name(), "address": fake.address()} for i in range(5)]

03with-handofcats.py

def _output(x):
    import json

    print(json.dumps(x, indent=2, ensure_ascii=False))


def people() -> list:
    import faker

    faker.Faker.seed(0)
    fake = faker.Faker("ja_JP")
    return [{"no": i, "name": fake.name(), "address": fake.address()} for i in range(5)]

a.diff

--- output.full.py	2020-02-08 20:46:14.000000000 +0900
+++ output.simple.py	2020-02-08 20:46:14.000000000 +0900
@@ -1,13 +1,13 @@
-import typing as t
+
 
 def hello(*, name="world") -> str:
     return f"hello, {name}"
 
 
-def main(argv: t.Optional[t.List[str]] = None) -> t.Any:
+def main(argv=None):
     import argparse
 
-    parser = argparse.ArgumentParser(prog=hello.__name__, description=hello.__doc__, formatter_class=type('_HelpFormatter', (argparse.ArgumentDefaultsHelpFormatter, argparse.RawTextHelpFormatter), {}))
+    parser = argparse.ArgumentParser(prog=hello.__name__, description=hello.__doc__)
     parser.print_usage = parser.print_help  # type: ignore
     parser.add_argument('--name', required=False, default='world', help='-')
     args = parser.parse_args(argv)

Makefile

00:
	python $(shell echo $@*.py)
01:
	python $(shell echo $@*.py)
02:
	python $(shell echo $@*.py)
03:
	python -m handofcats $(shell echo $@*.py) people --cont=$(shell echo $@*.py):_output
diff:
	python 00*.py --expose  > output.full.py
	python 00*.py --expose --simple > output.simple.py
	diff -u output.full.py output.simple.py

output.full.py

import typing as t

def hello(*, name="world") -> str:
    return f"hello, {name}"


def main(argv: t.Optional[t.List[str]] = None) -> t.Any:
    import argparse

    parser = argparse.ArgumentParser(prog=hello.__name__, description=hello.__doc__, formatter_class=type('_HelpFormatter', (argparse.ArgumentDefaultsHelpFormatter, argparse.RawTextHelpFormatter), {}))
    parser.print_usage = parser.print_help  # type: ignore
    parser.add_argument('--name', required=False, default='world', help='-')
    args = parser.parse_args(argv)
    params = vars(args).copy()
    return hello(**params)


if __name__ == '__main__':
    main()

output.simple.py

def hello(*, name="world") -> str:
    return f"hello, {name}"


def main(argv=None):
    import argparse

    parser = argparse.ArgumentParser(prog=hello.__name__, description=hello.__doc__)
    parser.print_usage = parser.print_help  # type: ignore
    parser.add_argument('--name', required=False, default='world', help='-')
    args = parser.parse_args(argv)
    params = vars(args).copy()
    return hello(**params)


if __name__ == '__main__':
    main()