Python private module function decorator

module_private_decorator.py

def module_private(func):
    @functools.wraps(func)
    def wrapper(*function_args):
        myself_module = func.__code__.co_filename
        caller_module = sys._getframe(1).f_code.co_filename
        if myself_module != caller_module:
            raise Exception("Function %s cannot be called from external module %s" % (func.__name__, caller_module))
        return func(*function_args)
    return wrapper