Setuptools entry_points plugins

examples/plugins/letsencrypt_example_plugins.py

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+"""Example Let's Encrypt plugins."""
+import zope.interface
+
+from letsencrypt.client import interfaces
+
+
+class Authenticator(object):
+    zope.interface.implements(interfaces.IAuthenticator)
+
+    description = 'Example Authenticator plugin'
+
+    def __init__(self, config):
+        self.config = config
+
+    # Implement all methods from IAuthenticator, remembering to add
+    # "self" as first argument, e.g. def prepare(self)...

examples/plugins/setup.py

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+from setuptools import setup
+
+
+setup(
+    name='letsencrypt-example-plugins',
+    package='letsencrypt_example_plugins.py',
+    install_requires=[
+        'letsencrypt',
+        'zope.interface',
+    ],
+    entry_points={
+        'letsencrypt.authenticators': [
+            'example = letsencrypt_example_plugins:Authenticator',
+        ],
+    },
+)