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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)
+```