使用importlib.import_module后无法访问模块函数

Question

I am attempting to access some functions in file that's one directory below the file where I want to use them. I am looking to do this in a dynamic fashion, as I will not know prior to runtime which functions the user will want to use.

I will ask the user for a particular scenario, for example, and if they request the 1424 scenario, I would like to have access to functions in a 'scenarios/scenario1424.py' file.

I am looking to do this using importlib.import_module(...), but I can't seem to have it let me access those functions even though I seem to be successfully importing the file module.

Directory structure:

code/
  - main.py
  scenarios/
    - __init__.py (empty)
    - scenario1420.py
    - scenario1421.py
    - scenario1424.py

Inside a scenario file, I'll have a bunch of methods defined like so:

def run():
  .......

def compute():
  .......

I seemed to be able to import the module using importlib.import_module('scenarios.scenario1424') (returns <module 'scenarios.scenario1424' from 'scenarios/scenario1424.pyc'> ), but when I attempt to access a function like: scenario1424.run() , I get a NameError ( NameError: name 'scenario1424' is not defined ).

Any thoughts?

Answer 1

import_module returns the module object itself, it is your own responsibility to assign it to a name you can use. So in your case it would be

scenario1424 = importlib.import_module('scenarios.scenario1424')

Answer 2

Does your subdirectory contain a __init__.py file?

Python uses __init__.py to determine if a directory is a module.