auto collect information in sub_modules when import in python?

Suppose I have below python file structure:

\function_group
     |-__init__.py
     |-sub_function1
     |----|__init__.py
     |----|sub_sub_func1.py
     |----|sub_sub_func2.py
     |----|sub_sub_func3.py 
     |-sub_function2
     |----|__init__.py
     |----|sub_sub_func1.py
     |----|sub_sub_func2.py
     |----|sub_sub_func3.py 

In each sub_sub_funcX.py there's a list functions will collect all function name in sub_sub_funcX.py itself,

# sub_sub_funcX.py  
# and each sub_sub_funcX.py file has similiar code

import inspect 
functions = inspect.getmembers(self?, inspect.isfunction)   # how to write the "self" here

def bar(x, y):
    return x * y

def bar1(x, y):
    return x + y

My questions are

1. on the above code marked "# how" , what is the right expression for point self? Should it be a "sub_sub_funcX"?

2. how I can get a full list of all those [functions] when import the top module function_group? I means is it possible each sub_function modules can report to the top it's function list in some how when import?

3. is there a way I can easy extend modules without adding housekeeping code in __init__ just an easy to hook and easy to remove? for example, I change the structure like this later:

\function_group
     |-__init__.py
     |-sub_function1
     |----|__init__.py
     |----|sub_sub_func1.py
     |----|sub_sub_func2.py
     |----|sub_sub_func3.py 
     |-sub_function2
     |----|__init__.py
     |----|sub_sub_func1.py
     |----|sub_sub_func2.py
     |----|sub_sub_func3.py 
     |----|sub_sub_func4.py            # new added
     |-sub_function3                   # new added    
     |----|__init__.py                 # new added
     |----|sub_sub_func1.py            # new added

     |----|sub_sub_sub_function_31     # new sub added    
     |--------|__init__.py             # new added
     |--------|sub_sub_sub_sub_func开发者_如何学编程1.py# new added

---

1: You need

import inspect
import sys
inspect.getmembers(sys.modules[__name__], inspect.isfunction)

2: The best answer I can think of is to import the submodules, and inspect them in the top-level.

1. No, the onus is on the top-level package (the one which is imported) to do what it needs to do. You can't import the top package and expect the sub-packages to do their thing, unless they're imported in the top-package. And since you don't want to modify your top-level init.py, that's not going to happen.

Can you tell us exactly what you're trying to do with those functions? I'm getting the feeling that there has to be a better way than this much introspection.