From 37219ffbb64ffd057cb1fd69e1f880a2d93fab48 Mon Sep 17 00:00:00 2001
From: Brandon Rozek <rozekbrandon@gmail.com>
Date: Sat, 11 Jul 2020 20:46:33 -0400
Subject: [PATCH] New Post

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 content/blog/asynccallbacks.md | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 content/blog/asynccallbacks.md

diff --git a/content/blog/asynccallbacks.md b/content/blog/asynccallbacks.md
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+---
+title: "Quick Python: Async Callbacks"
+date: 2020-07-11T20:23:29-04:00
+draft: false
+tags: ["python"]
+---
+
+I've written a post on using [callbacks in Python](https://brandonrozek.com/blog/pysubscribepattern/). Though to add callbacks to `asyncio` functions, you'll have to interact with the loop object directly. Replace the emit function in the previous post with the following:
+```python
+class Application:
+    # ...
+    def emit(self, message):
+        for callback in self.callbacks:
+            if asyncio.iscoroutine(callback):  
+                loop = asyncio.get_running_loop()  
+                loop.call_soon(  
+                    functools.partial(  
+                        asyncio.ensure_future,
+                        callback(event, index)  
+                    )  
+            else:  
+                callback(event, index)
+```