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snippets/python/s/shuffle.md

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+---
+title: Shuffle list
+type: snippet
+language: python
+tags: [list,random]
+cover: tent-stars
+dateModified: 2020-11-02T19:28:35+02:00
+---
+
+Randomizes the order of the values of an list, returning a new list.
+
+- Uses the [Fisher-Yates algorithm](https://en.wikipedia.org/wiki/Fisher%E2%80%93Yates_shuffle) to reorder the elements of the list.
+- [`random.shuffle`](https://docs.python.org/3/library/random.html#random.shuffle) provides similar functionality to this snippet.
+
+```py
+from copy import deepcopy
+from random import randint
+
+def shuffle(lst):
+  temp_lst = deepcopy(lst)
+  m = len(temp_lst)
+  while (m):
+    m -= 1
+    i = randint(0, m)
+    temp_lst[m], temp_lst[i] = temp_lst[i], temp_lst[m]
+  return temp_lst
+```
+
+```py
+foo = [1, 2, 3]
+shuffle(foo) # [2, 3, 1], foo = [1, 2, 3]
+```