features: fix typing

for an annoying mypy bug

1 files changed, 18 insertions, 10 deletions

diff --git a/slixmpp/features/feature_starttls/stanza.py b/slixmpp/features/feature_starttls/stanza.py
index 2f971723..70979402 100644
--- a/slixmpp/features/feature_starttls/stanza.py
+++ b/slixmpp/features/feature_starttls/stanza.py
@@ -4,39 +4,47 @@
 # This file is part of Slixmpp.
 # See the file LICENSE for copying permission.
 from slixmpp.xmlstream import StanzaBase, ElementBase
+from typing import Set, ClassVar
 
 
 class STARTTLS(StanzaBase):
-
-    """
     """
 
+    .. code-block:: xml
+
+         <starttls xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>
+
+    """
     name = 'starttls'
     namespace = 'urn:ietf:params:xml:ns:xmpp-tls'
     interfaces = {'required'}
     plugin_attrib = name
 
     def get_required(self):
-        """
-        """
         return True
 
 
 class Proceed(StanzaBase):
-
-    """
     """
 
+    .. code-block:: xml
+
+        <proceed xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>
+
+    """
     name = 'proceed'
     namespace = 'urn:ietf:params:xml:ns:xmpp-tls'
-    interfaces = set()
+    interfaces: ClassVar[Set[str]] = set()
 
 
 class Failure(StanzaBase):
-
-    """
     """
 
+    .. code-block:: xml
+
+        <failure xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>
+
+    """
     name = 'failure'
     namespace = 'urn:ietf:params:xml:ns:xmpp-tls'
-    interfaces = set()
+    interfaces: ClassVar[Set[str]] = set()