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snippets/python/s/find-parity-outliers.md

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+---
+title: Find parity outliers
+type: snippet
+language: python
+tags: [list,math]
+cover: beach-pineapple
+dateModified: 2020-11-02T19:27:53+02:00
+---
+
+Finds the items that are parity outliers in a given list.
+
+- Use `collections.Counter` with a list comprehension to count even and odd values in the list.
+- Use `collections.Counter.most_common()` to get the most common parity.
+- Use a list comprehension to find all elements that do not match the most common parity.
+
+```py
+from collections import Counter
+
+def find_parity_outliers(nums):
+  return [
+    x for x in nums
+    if x % 2 != Counter([n % 2 for n in nums]).most_common()[0][0]
+  ]
+```
+
+```py
+find_parity_outliers([1, 2, 3, 4, 6]) # [1, 3]
+```