Reorganize snippets

python/s/roll.md

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+---
+title: Rotate list elements
+type: snippet
+language: python
+tags: [list]
+cover: colorful-pots
+dateModified: 2020-11-02T19:15:44+02:00
+---
+
+Moves the specified amount of elements to the start of the list.
+
+- Use slice notation to get the two slices of the list and combine them before returning.
+
+```py
+def roll(lst, offset):
+  return lst[-offset:] + lst[:-offset]
+```
+
+```py
+roll([1, 2, 3, 4, 5], 2) # [4, 5, 1, 2, 3]
+roll([1, 2, 3, 4, 5], -2) # [3, 4, 5, 1, 2]
+```