Use decorator to avoid retyping function/class names into __all__ module variable. It's an effective way to cut down large number of unnecessary imports caused by "from some_module import *". Works on Python 2.6 and greater.

add_to__all__decorator.py

import sys

def add_to__all__(func_or_class):
    """"Use decorator to avoid retyping function/class names into __all__ module level variable."""
    all_list = sys.modules[func_or_class.__module__].__dict__.setdefault('__all__', [])

    if func_or_class.__name__ not in all_list:
        all_list.append(func_or_class.__name__)

    return func_or_class

#
# Class Decoration Example:
#
# @add_to__all__
# class Application(object):
#     pass

#
# Function Decoration Example:
#
# @add_to__all__
# def fabric_deploy_app():
#     pass