Edit Python blog entry to fix typo and add another map example

src/posts/2021/05/handy-python-tips.md

@@ -222,6 +222,12 @@ Output:
 [1, 2, 3, 4, 5]
 ```
 
+It's most useful in assigning variables easily when you know the format the input will be in.
+
+```python
+a, b = (map(int, input().split()))
+```
+
 ## 5. List generators
 
 You can generate a new list using inline `for`.