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from importlib import import_module
from importlib import resources

PLUGINS = dict()

def register_plugin(func):
    """Decorator to register plug-ins"""
    name = func.__name__
    PLUGINS[name] = func
    return func

def __getattr__(name):
    """Return a named plugin"""
    try:
        return PLUGINS[name]
    except KeyError:
        _import_plugins()
        if name in PLUGINS:
            return PLUGINS[name]
        else:
            raise AttributeError(
                f"module {__name__!r} has no attribute {name!r}"
            ) from None

def __dir__():
    """List available plug-ins"""
    _import_plugins()
    return list(PLUGINS.keys())

def _import_plugins():
    """Import all resources to register plug-ins"""
    for name in resources.contents(__name__):
        if name.endswith(".py"):
            import_module(f"{__name__}.{name[:-3]}")

from . import register_plugin

@register_plugin
def hello_1():
    print("Hello from Plugin 1")

from . import register_plugin

@register_plugin
def hello_2():
    print("Hello from Plugin 2")

@register_plugin
def goodbye():
    print("Plugin 2 says goodbye")

>>> import plugins
>>> plugins.hello_1()
Hello from Plugin 1

>>> dir(plugins)
['goodbye', 'hello_1', 'hello_2']

>>> plugins.goodbye()
Plugin 2 says goodbye