---
title: similarity
tags: list,beginner
---

Returns a list of elements that exist in both lists.

Use list comprehension on `a` to only keep values contained in both lists.

```py
def similarity(a, b):
  return [item for item in a if item in b]
```

```py
similarity([1, 2, 3], [1, 2, 4]) # [1, 2]
```