This is another answer that might be closer to what you want.
In __init__.py
you can add this to import all python files in the package.
Note that it doesn't do packages.. not sure how. And I'm using windows
from os import listdir
from os.path import abspath, dirname, isfile, join
# get location of __init__.py
init_path = abspath(__file__)
# get folder name of __init__.py
init_dir = dirname(init_path)
# get all python files
py_files = [file_name.replace(".py", "") for file_name in listdir(init_dir) \
if isfile(join(init_dir, file_name)) and ".py" in file_name and not ".pyc" in file_name]
# remove this __init__ file from the list
py_files.remove("__init__")
__all__ = py_files