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+.. _differences:
+
+Differences from SleekXMPP
+==========================
+
+**Python 3.4+ only**
+ slixmpp will only work on python 3.4 and above.
+
+**Stanza copies**
+ The same stanza object is given through all the handlers; a handler that
+ edits the stanza object should make its own copy.
+
+**Replies**
+ Because stanzas are not copied anymore,
+ :meth:`Stanza.reply() <.StanzaBase.reply>` calls
+ (for :class:`IQs <.Iq>`, :class:`Messages <.Message>`, etc)
+ now return a new object instead of editing the stanza object
+ in-place.
+
+**Block and threaded arguments**
+ All the functions that had a ``threaded=`` or ``block=`` argument
+ do not have it anymore. Also, :meth:`.Iq.send` **does not block
+ anymore**.
+
+**Coroutine facilities**
+ **See** :ref:`using_asyncio`
+
+ If an event handler is a coroutine, it will be called asynchronously
+ in the event loop instead of inside the event caller.
+
+ A CoroutineCallback class has been added to create coroutine stream
+ handlers, which will be also handled in the event loop.
+
+ The :class:`~.slixmpp.stanza.Iq` object’s :meth:`~.slixmpp.stanza.Iq.send`
+ method now takes a *coroutine* parameter which, if set to ``True``,
+ will return a coroutine which will (asyncio-)block until the reply
+ is received.
+
+ Many plugins (WIP) calls which retrieve information also accept this
+ ``coroutine`` parameter.
+
+**Architectural differences**
+ slixmpp does not have an event queue anymore, and instead processes
+ handlers directly after receiving the XML stanza.
+
+.. note::
+ If you find something that doesn’t work but should, please report it.