Python dynamically import modules

Question

I am trying to find the best practice for importing modules dynamically. I have multiple files in a specific folder called providers which contain a class Updater and all of them have the same objects.

This is the structure I have:

main.py
|-providers:
  --__init__.py
  --plex.py
  --pihole.py

Each provider has 3 class objects: get_latest_version, get_current_version, install.

This is the contents of main.py file:

#!/usr/bin/env python3
from Updater.plex import Updater as PlexUpdater
from Updater.pihole import Updater as PiholeUpdater

for provClass in [PlexUpdater, PiholeUpdater]:
    provider = provClass()
    latest_version = provider.get_latest_version()
    current_version = provider.get_current_version()
    provider.install()

I need to be able to create file on the providers folder and be automatically imported on the main file without explicitly importing myself. Could you suggest a way to make this work?

bkbilly · Accepted Answer · 2020-10-24 12:33:42Z

2

I finally found how to do this. On the init file I loaded all modules and returned them as a dictionary.

Code for __init__.py:

from pkgutil import iter_modules
from pathlib import Path
from importlib import import_module

globals()['modules'] = {}

# iterate through the modules in the current package
package_dir = Path(__file__).resolve().parent
for (_, module_name, _) in iter_modules([package_dir]):
    globals()['modules'][module_name] = getattr(import_module(f"{__name__}.{module_name}"), 'Updater')

The main.py changed into this:

#!/usr/bin/env python3
import providers

for provider_name, module in providers.modules.items():
    provider = module()
    latest_version = provider.get_latest_version()
    current_version = provider.get_current_version()
    provider.install()

Most helpful article was this.

answered Oct 24, 2020 at 12:33

bkbilly

1314 bronze badges

1

Note that you don't need globals(). You could just do modules = {} and modules[module_name] = ....

Jasmijn
– Jasmijn

2020-10-24 22:29:57 +00:00
Commented Oct 24, 2020 at 22:29
Oh yeah. You are right. Thanks for pointing that out.

bkbilly
– bkbilly

2020-10-24 23:03:48 +00:00
Commented Oct 24, 2020 at 23:03

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