adding experimental __slots__ to some classes

amqp/abstract_channel.py

@@ -39,6 +39,19 @@ def __init__(self, connection, channel_id):
 
         self._setup_listeners()
 
+    __slots__ = (
+        "is_closing",
+        "connection",
+        "channel_id",
+        "method_queue",
+        "auto_decode",
+        "_pending",
+        "_callbacks",
+        # adding '__dict__' to get dynamic assignment
+        "__dict__",
+        "__weakref__",
+        )
+
     def __enter__(self):
         return self
 

amqp/basic_message.py

@@ -107,6 +107,16 @@ def __init__(self, body='', children=None, channel=None, **properties):
         self.body = body
         self.channel = channel
 
+    __slots__ = (
+        "delivery_info",
+        "body",
+        "channel",
+
+        # adding '__dict__' to get dynamic assignment
+        "__dict__",
+        "__weakref__",
+        )
+
     @property
     def headers(self):
         return self.properties.get('application_headers')

amqp/serialization.py

@@ -488,6 +488,19 @@ def __init__(self, frame_method=None, frame_args=None, **props):
         self.body_size = 0
         self.ready = False
 
+    __slots__ = (
+        "frame_method",
+        "frame_args",
+        "properties",
+        "_pending_chunks",
+        "body_received",
+        "body_size",
+        "ready",
+        # adding '__dict__' to get dynamic assignment
+        "__dict__",
+        "__weakref__",
+        )
+
     def __getattr__(self, name):
         # Look for additional properties in the 'properties'
         # dictionary, and if present - the 'delivery_info' dictionary.

amqp/transport.py

@@ -97,6 +97,22 @@ def __init__(self, host, connect_timeout=None,
         self.write_timeout = write_timeout
         self.socket_settings = socket_settings
 
+    __slots__ = (
+        "connection",
+        "sock",
+        "raise_on_initial_eintr",
+        "_read_buffer",
+        "host",
+        "port",
+        "connect_timeout",
+        "read_timeout",
+        "write_timeout",
+        "socket_settings",
+        # adding '__dict__' to get dynamic assignment
+        "__dict__",
+        "__weakref__",
+        )
+
     def __repr__(self):
         if self.sock:
             src = f'{self.sock.getsockname()[0]}:{self.sock.getsockname()[1]}'