Python3 Migrate

venv/lib/python3.7/site-packages/pykka/_envelope.py

@@ -0,0 +1,23 @@
+class Envelope(object):
+    """
+    Envelope to add metadata to a message.
+
+    This is an internal type and is not part of the public API.
+
+    :param message: the message to send
+    :type message: any
+    :param reply_to: the future to reply to if there is a response
+    :type reply_to: :class:`pykka.Future`
+    """
+
+    # Using slots speeds up envelope creation with ~20%
+    __slots__ = ['message', 'reply_to']
+
+    def __init__(self, message, reply_to=None):
+        self.message = message
+        self.reply_to = reply_to
+
+    def __repr__(self):
+        return 'Envelope(message={!r}, reply_to={!r})'.format(
+            self.message, self.reply_to
+        )