ディレクトリ内のPythonモジュールを動的インポート/リロード

plugin_manager.py

import os
import sys
import time
from glob import glob
from importlib import import_module, reload

from watchdog.events import FileSystemEventHandler, FileSystemEvent
from watchdog.observers import Observer

sys.path.append('plugins')

plugins = {}


def scan_plugin(path):
    for filepath in glob(os.path.join(path, '*.py')):
        load_plugin(filepath)


def load_plugin(filepath):
    filename = os.path.basename(filepath)
    module_name = os.path.splitext(filename)[0]
    if module_name not in plugins:
        plugins[module_name] = import_module(module_name)
        print('{} loaded.'.format(module_name))
    else:
        plugins[module_name] = reload(plugins[module_name])
        print('{} reloaded.'.format(module_name))


class PluginHandler(FileSystemEventHandler):

    def on_created(self, event: FileSystemEvent):
        print(event)
        if event.src_path.endswith('.py'):
            load_plugin(event.src_path)


scan_plugin('plugins')

observer = Observer()
observer.schedule(PluginHandler(), 'plugins')
observer.start()

while True:
    time.sleep(1)