27 lines
696 B
Markdown
27 lines
696 B
Markdown
---
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title: Find parity outliers
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tags: list,math,intermediate
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firstSeen: 2020-01-08T18:54:35+02:00
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lastUpdated: 2020-11-02T19:27:53+02:00
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---
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Finds the items that are parity outliers in a given list.
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- Use `collections.Counter` with a list comprehension to count even and odd values in the list.
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- Use `collections.Counter.most_common()` to get the most common parity.
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- Use a list comprehension to find all elements that do not match the most common parity.
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```py
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from collections import Counter
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def find_parity_outliers(nums):
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return [
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x for x in nums
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if x % 2 != Counter([n % 2 for n in nums]).most_common()[0][0]
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]
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```
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```py
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find_parity_outliers([1, 2, 3, 4, 6]) # [1, 3]
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```
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