파이썬 모듈에서 내보낼 함수명 모으기

import sys

def export(fn):
    mod = sys.modules[fn.__module__]
    if hasattr(mod, '__all__'):
        mod.__all__.append(fn.__name__)
    else:
        mod.__all__ = [fn.__name__]
    return fn

from lib import export
__all__ = [] # optional - we create a list if __all__ is not there.

@export
def foo(): pass