Update in-place.md

1 files changed, 21 insertions, 2 deletions

diff --git a/bot/resources/tags/in-place.md b/bot/resources/tags/in-place.md
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@@ -1,5 +1,24 @@
 **Out of Place** and **In Place**
 
-- An "out of place" operation is one that creates a new object, leaving the original object unchanged. 
-- An "in place" operation is one that modifies the original object, without creating a new one.
+- An "out of place" operation creates a new object, leaving the original object unchanged. 
+- An "in place" operation modifies the original object, without creating a new one. These return None explicitly.
 
+A prime example of these different ideas is `list.sort()` vs `sorted(...)`:
+
+`list.sort()` can cause many errors within your code, one of the most common is shown below:
+
+```py
+a_list = [3, 1, 2]
+a_new_list = a_list.sort() # This will be None
+print(a_new_list[1]) # This will error
+```
+
+On the other hand, `sorted()` can also cause errors:
+
+```py
+a_list = [3, 1, 2]
+sorted(a_list)
+print(a_list[0]) # You may expect 1, but it will print 3
+```
+
+Both of these errors are an easy fixes.