Few language thoughts

Author: calaldees

teachprogramming/static/projects/language_features/async-await.md

@@ -96,4 +96,13 @@ Further reading
 ---------------
 
 * [How to Use Fetch with async/await](https://dmitripavlutin.com/javascript-fetch-async-await/)
-    * Concurrent fetches
+    * Concurrent fetches
+
+
+---
+
+
+```python
+t.Callable[[URLParams], t.Awaitable[APIPayload]]
+```
+Explanation of t.Awaitable pattern https://stackoverflow.com/a/59177557/3356840

teachprogramming/static/projects/language_features/list-contatination.md

@@ -0,0 +1,8 @@
+https://peps.python.org/pep-0584/#more-than-one-way-to-do-it
+> doesn’t say that there should be Only One Way To Do It. But it does have a prohibition against allowing “more than one way to do it”.
+
+Concatenation operator: a + b
+In-place concatenation operator: a += b
+Slice assignment: a[len(a):] = b
+Sequence unpacking: [*a, *b]
+Extend method: a.extend(b)